General Linux

Installing a software RAID 10 Debian system with LUKS disk encryption

In this guide we will be installing Debian 9 (aka stretch) on a physical server with 4 disks. The role of this machice is to be used as a Storage/NAS system. We will create a software RAID 10 setup, with LVM and LUKS full disk encryption. Our goals:

  • Install a Debian 9 with RAID10/LVM/LUKS.
  • Secure SSH.
  • Enable Firewall (UFW).
  • Setup bonding with the two network cards.
  • Setup remote system unlock with dropbear and initramfs.
  • Setup disk-monitoring with smartmontools and mdadm.
  • Setup kexec for faster reboots.

Computer specs

  • Type: HP ProLiant MicroServer
  • CPU: AMD Turion(tm) II Neo N40L Dual-Core Processor
  • RAM: 2GB
  • Disks: 4x3TB SATA
  • Network:
    • Broadcom Limited NetXtreme BCM5723 Gigabit Ethernet PCIe (on board)
    • Intel Corporation 82574L Gigabit Network Connection (extra)


  • Server IP:
  • Netmask:
  • Gateway IP:
  • DNS IP:
  • Hostname:

Install Debian stretch

Basic Settings

It would probably be more clear if there were screenshots for each step, but this was an installation on a physical server and taking photos for each step, opposes my laziness :). Just follow the instructions and you will be fine.

  • Choose: Install
  • Language: English
  • Country: other
  • Europe: Cyprus
  • Country to base default locale settings: United States
  • Keymap to use: American English
  • Primary network interface: enp3s0: Broadcom Limeted NetXtream BCM5723 Gigabit Ethernet PCIe
  • Let it get an IP from DHCP
  • Hostname: storage
  • Domain name:
  • Root password: SomethingBigAndUnpredictable
  • Re-enter password to verify: SomethingBigAndUnpredictable
  • Full name: Sysadmin
  • Username: admin
  • Choose a password for the new user: AlsoSomethingBigAndUnpredictable
  • Re-enter password to verify: AlsoSomethingBigAndUnpredictable
  • Select your time zone: Asia/Nicosia
  • Partitioning method: Manual

Feel free to adjust the above according to your own preferences.


There are 4 disks of 3TB each (3.0 TB SATA):

  • SCSI1 (0,0,0) (sda)
  • SCSI2 (0,0,0) (sdb)
  • SCSI3 (0,0,0) (sdc)
  • SCSI4 (0,0,0) (sdd)

Not really SCSI but SATA in fact.

Partition the devices

Then create a raid partition for /boot:

  • Select the free space of sda and ‘Enter’
  • Create a new partition
  • New partition size: 512 MB
  • Location of new partition: Beginning
  • Use as: physical volume for RAID
  • Done setting up the partition

Lastly create the raid partition to be used by the encrypted volume:

  • Select the free space of sda and ‘Enter’
  • Create a new partition
  • New partition size: 3.0 TB
  • Location of new partition: Beginning
  • Use as: physical volume for RAID
  • Done setting up the partition

Repeat the above steps for sdb, sdc and sdd.

Setup Software RAID 10

First select ‘Configure software RAID’ and follow these steps:

  • Write the changes to the storage devices and configure RAID? Yes

The we create the software RAID (MD) devices. First we create device md0 for /boot:

  • Create MD Device
  • RAID10
  • Number of active devices inn the RAID10 array: 4
  • Number of spare devices inn the RAID10 array: 0
  • Active devices for the RAID10 array (use ‘Space bar’ to select)
    • /dev/sda2
    • /dev/sdb2
    • /dev/sdc2
    • /dev/sdd2
  • Press ‘Continue’ when done.

Then we create the software RAID device to be used for the encrypted volume (md1):

  • Create MD Device
  • RAID10
  • Number of active devices inn the RAID10 array: 4
  • Number of spare devices inn the RAID10 array: 0
  • Active devices for the RAID10 array (use the ‘Space bar’ to select)
    • /dev/sda3
    • /dev/sdb3
    • /dev/sdc3
    • /dev/sdd3
  • Press ‘Continue’ when done.
  • Press ‘Finish’ when done.

Create the /boot volume

When done press ‘Finish partitioning and write changes to disk’.`

When finished you will see a ‘RAID10 device #0 1GB Software RAID device’:

  • Select: #1 1.0GB
  • Use as: Ext4 journaling file system
  • Mount point: /boot
  • Done setting up the partition

Setup the encrypted volume

We will be using the software RAID /dev/md1 device for the encrypted volume.

Now select ‘Configure encrypted volumes’ and follow these steps:

  • Write the changes to disk and configure encrypted volumes? Yes
  • Create encrypted volumes

  • Select: /dev/md1
  • Erase data: yes (this will take a long time)
  • Done setting up the partition

  • Write the changes to disk and configure encrypted volumes? Yes

  • Finish
  • Encryption passphrase: MyVeryLongEncryptionPassphrase
  • Re-enter the passphrase to verify: MyVeryLongEncryptionPassphrase
  • Setup LVM

    Next we select the ‘Configure the Logical Volume Manager’ option and follow these steps:

    • Write the changes to disks and configure LVM? Yes
  • Create volume group

  • Volume group name: VG00
  • Devices for the new volume group:
    • /dev/mapper/md1_crypt
  • Then we create the Logical Volumes (LV). First let’s create a SWAP volume:

    • Create logical volume
    • Volume group: VG00
    • Logical volume name: SWAP
    • Logical volume size: 2048MB (2G is more than enough for this system)

    Lastly we create the system (ROOT) volume. On an enterprise installation we may want to use different volumes for /usr, /home, /var, etc but for a home installation we will be fine to use just one.

    • Create logical volume
    • Volume group: VG00
    • Logical volume name: ROOT
    • Logical volume size: 5996818MB (All available space)

    Press ‘Finish’ when done.

    Start the installation

    After all the steps are completed these Logical Volumes will be present on the system:

    • LVM VG VG00, LV ROOT 0 6.0 TB
    • LVM VG VG00, LV SWAP 0 2.0 GB

    Create the ROOT filesystem

    Under the ‘LVM VG VG00, LV ROOT 0 6.0 TB’ line select the ‘#1 6.0TB’ option:

    • Use as: Ext4 journaling file system
    • Mount point: /
    • Done setting up this partition

    Create the SWAP space

    Under the ‘LVM VG VG00, LV SWAP 0 2.0 GB’ line select the ‘#1 2.0GB’ option:

    • Use as: swap area
    • Done setting up this partition

    Now we are ready to write the changes and start the installation. Press the ‘Finish partitioning and write changes to disk’ option to continue:

    • Write the changes to disks? Yes

    Wait for the base install to finish. Then select a country close to you. No debian mirrors in Cyprus so I use UK:

    • Debian archive mirror country: United Kingdom
    • Debian archive mirror:
    • HTTP proxy: (none)

    Wait for the APT configuration to Finish.

    • Participate in the package usage survey: no
  • Choose software to install:

    • SSH server
    • standard system utilities
  • Wait while software is installing

    • Install the GRUB boot loader to the master boot record.
    • Device for boot loader installation:
      • /dev/sda

    Wait for the installation to finish and reboot. Remember to remove the USB during the reboot cycle.

    Post install steps

    During start-up you will see the ‘Please unlock md1_crypt’ prompt. Type your LUKS passphrase to unlock the disk and continue.

    Update and Upgrade

    Login as root:

    # apt update && apt -y dist-upgrade

    Install essential packages

    # apt -y install vim htop multitail ntp byobu ufw unattended-upgrades downtimed

    Secure ssh

    You need to generate an SSH key pair on you PC, if you don’t have one (you should!):

    $ ssh-keygen -b 4096

    Copy the public key:

    $ cat ~/.ssh/

    Paste the public key at the end of the /root/.ssh/authorized_keys file in your server and try to login from your PC:

    $ ssh root@

    Some final adjustments on your SSH config (/etc/ssh/sshd_config). Change these values:

    Port 2233
    PasswordAuthentication no

    Restart SSH:

    # systemctl restart ssh.service

    Enable the UFW firewall

    We are using port 2233 for SSH so we need to allow that and enable the firewall:

    # ufw allow 2233/tcp
    # ufw enable

    Setup bonding

    Since we have two ethernet cards, we may take advantage of thr Linux bonding feature and join them as one. We will be using the Adaptive load balancing mode which provides load balancing of transmit, load balancing of receive for IPv4 and requires no configuration from the switch side.

    First we need to install ifenslave:

    # apt -y install ifenslave

    Set up this in /etc/network/interfaces:

    # This file describes the network interfaces available on your system
    # and how to activate them. For more information, see interfaces(5).
    source /etc/network/interfaces.d/*
    # The loopback network interface
    auto lo
    iface lo inet loopback
    # enp2s0 is manually configured, and slave to the "bond0" bonded NIC
    auto enp2s0
    iface eth0 inet manual
        bond-master bond0
    # enp3s01 is also manually configured, thus creating a 2-link bond.
    auto enp3s0
    iface eth1 inet manual
        bond-master bond0
    # bond0 is the bonded NIC and can be used like any other normal NIC.
    # bond0 is configured using static network information.
    auto bond0
    iface bond0 inet static
        # bond0 uses adaptive load balancing
        bond-mode 6
        bond-miimon 100
        bond-slaves enp2s0 enp3s0

    An ifup bond0 should bring the bonded interface up. Or you can just reboot.

    Setup remote-unlock with dropbear

    The server will be a headless system, located in a difficult to access location. So we need a way to unlock it when a power failure occurs. The most convenient way to do this is to use a mandos server but convenience comes at a cost. A safer and easier way is to use dropbear during boot (initrd). The weak point of this solution is that the server will be basically offline until the sysadmin manually unlocks it, to boot.

    First we install dropbear for initrd:

    # apt -y install dropbear-initramfs

    Then we set a custom ssh port for dropbear. This better be different than the custom ssh port we used earlier. Change the dropbear port to 2244 in /etc/dropbear-initramfs/config:

    DROPBEAR_OPTIONS="-p 2244"

    Add the static IP in the initramtools configuration (/etc/initramfs-tools/initramfs.conf):


    Copy the authorized_keys file in /etc/dropbear-initramfs:

    # cp /root/.ssh/authorized_keys /etc/dropbear-initramfs/

    Regenerate the initrd file:

    # update-initramfs -u

    Now reboot and ssh to it to test it:

    $ ssh -p 2244 root@

    If your pubkeys are in place you will enter a busybox shell. Enter the crypt-unlock command, supply your unlock passphrase and the system will boot to the encrypted system.

    Setup a local MTA for notifications

    We will be using our main mailserver as a smarthost for mail to go through.

    Install the postfix MTA and the mail utility:

    # apt -y install postfix mailutils

    Answer these questions:

    • General type of mail configuration: Internet with smarthost
    • System mail name:
    • SMTP relay host (blank for none):

    Test it:

    # echo 'Testing #1' | mail -s 'Test #1'

    If you get a mail in your mailbox then everything is set. If not extra configuration may be needed on the smarthost. Contact the sysadmin of the smarthost, or check the logs if you access to it.

    Setup pro-active disk monitoring

    Install smartmontools:

    # apt -y install smartmontools

    Enable S.M.A.R.T, offline testing, attribute autosave, short and long test on all 4 devices. Add these lines in /etc/smartd.conf:

    /dev/sda -a -d sat -o on -S on -s (S/../.././02|L/../../6/03) -m -M exec /usr/share/smartmontools/smartd-runner
    /dev/sdb -a -d sat -o on -S on -s (S/../.././02|L/../../6/03) -m -M exec /usr/share/smartmontools/smartd-runner
    /dev/sdc -a -d sat -o on -S on -s (S/../.././02|L/../../6/03) -m -M exec /usr/share/smartmontools/smartd-runner
    /dev/sdd -a -d sat -o on -S on -s (S/../.././02|L/../../6/03) -m -M exec /usr/share/smartmontools/smartd-runner

    Restart smartmontools:

    # systemctl restart smartmontools.service

    Setup Software RAID10 monitoring

    We also need to setup monitoring for the software raid. Add your email address in the /etc/mdadm/mdadm.conf file:


    Restart the mdmonitor service:

    # systemctl restart mdmonitor.service

    Setup kexec for faster reboots

    Kexec is a Linux kernel mechanism that can load a fresh kernel from a running system. This results in a “reboot” without in fact rebooting the computer. The system loads a new kernel, the system appears “rebooted” but skipping the BIOS?UEFI initialization, thus resulting in faster reboots.

    Install kexec-tools:

    # apt -y install kexec-tools

    The ‘Should kexec-tools handle reboots (sysvinit only)?’ question is related only to sysvinit systems. Since we are using systemd, it has no effect in our case.

    Now if you want to reboot instead of running reboot you can run systemctl kexec. The latter command will reboot the system without going though BIOS/UEFI, POST etc and your system downtime is minimized.

    And we are done! Store your server in a protected location, add a UPS for power backup and you are ready.



    Setting up a Dual NIC, LXD Container

    LXD is a relatively new technology by Canonical. It is a container hypervisor that builds on top of LXC. It shares some similarities with Docker, but LXD focuses on full blown containerized systems, instead of containerized applications.

    LXD/LXC creates lighter systems than VM hypervisors, and it is an easy way to experiment with different software without messing up with your system. You can also use it in production, to run Linux systems with much greater density than on VM hypervisors. The only drawback is that the container must be the same OS as the host (Linux in this case) and it depends on the host for kernel functionality (e.g. modules etc).

    In this guide we will build an LXD container with two virtual NICs which are attached to the physical NIC of it’s host using bridged networking.


    • An Ubuntu 16.04 host with two physical NICs

    Prepare host networking

    Install dependencies

    # apt -y install bridge-utils

    Setup networking on the host

    There are two interfaces on the host enp3s0 and enp5s0. The first one, enp3s0 is the primary and connects to the main, DHCP enabled, internal network. The second one is connected to an isolated internal network where some critical services are running. There is no DHCP in the isolated network.

    Prepare your /etc/network/interfaces configuration file like this:

    # The loopback network interface 
    auto lo
    iface lo inet loopback
    # The main Bridge
    auto br0
    iface br0 inet dhcp
        bridge-ifaces enp3s0
        bridge-ports enp3s0
        up ip link set enp3s0 up
    # The primary network interface
    iface enp3s0 inet manual
    # The secondary Bridge
    auto br1
    iface br1 inet manual
            bridge-ifaces enp5s0
            bridge-ports enp5s0
            up ip link set enp5s0 up
    # The secondary network interface
    iface enp5s0 inet manual

    Setup LXC/ LXD

    Installation of LXD

    # apt -y install lxd

    Prepare a new profile

    We need a profile with two NICs. First create a new profile:

    # lxc profile copy default dualnic

    Then edit the new profile with lxc profile edit dualnic:

      user.network_mode: link-local
    description: Dual nic profile
        name: eth0
        nictype: bridged
        parent: br0
        type: nic
        name: eth1
        nictype: bridged
        parent: br1
        type: nic
    name: dualnic

    The names of the virtual interfaces of the container will be eth0 for the primary and eth1 for the secondary.

    Launch the container

    Now we want to launch a Debian jessie container, which we will retrieve from the prepared images on the

    # lxc launch images:debian/jessie mycontainer -p dualnic

    List the container:

    # lxc list
    |    NAME     |  STATE  |         IPV4         | IPV6 |    TYPE    | SNAPSHOTS |
    | mycontainer | RUNNING | (eth0) |      | PERSISTENT | 0         |

    The IP listed above was set by the DHCP server in the primary network.

    Connect to the container:

    # lxc exec mycontainer bash

    Setup container’s networking

    Edit /etc/network/interfaces inside our container:

    auto lo
    iface lo inet loopback
    auto eth0
    iface eth0 inet dhcp
    auto eth1
    iface eth1 inet static
            up ip route add  via dev eth1
            up ip route add  via dev eth1

    The routes and are internal routes that need to be reached though the secondary network.

    Take a clean snapshot

    Before you start working on your container, it is a good idea to get a clean snapshot, so you can revert to it, in case you mess something up.

    # lxc snapshot mycontainer

    If you want to learn more about the and features I urge you to read the excellent introduction to LXD 2.0 by Stéphane Graber



    Installing Rocket.Chat on Debian

    Rocket.Chat is a free/open source software for team collaboration. It is a full featured platform and an ideal alternative to Slack, for organizations that are dedicated to the Free Software philosophy.

    In this guide we will demonstrate how you can setup Rocket.Chat for your organization.


    • A Debian stretch VM or server.
    • A FQDN pointing to the system’s IP. We will be using throughout this guide.

    Installation of

    Install the Snappy package manager

    Snappy is not installed on Debian by default, so we need to install it:

    # apt install snapd ca-certificates

    Install Rocket.Chat

    # snap install rocketchat-server

    Check its status:

    # systemctl status snap.rocketchat-server.rocketchat-server.service
    ● snap.rocketchat-server.rocketchat-server.service - Service for snap application rocketchat-server.rocketchat-server
       Loaded: loaded (/etc/systemd/system/snap.rocketchat-server.rocketchat-server.service; enabled; vendor preset: enabled)
       Active: active (running) since Tue 2017-01-03 12:27:50 PST; 12min ago
     Main PID: 24891 (node)
        Tasks: 10 (limit: 4915)
       CGroup: /system.slice/snap.rocketchat-server.rocketchat-server.service
               └─24891 node /snap/rocketchat-server/326/main.js
    Jan 03 12:27:50 rocket systemd[1]: Started Service for snap application rocketchat-server.rocketchat-server.

    Check its port (default is 3000):

    # ss -lnptu | grep 3000
    tcp    LISTEN     0      128       *:3000                  *:*                   users:(("node",pid=24891,fd=13))

    Looks OK

    Configure TLS

    Install nginx

    The core application does not support TLS so we will be setting up an nginx reverse proxy on top of it.

    Install NGINX and certbot from Let’s Encrypt:

    # apt -y install nginx python-certbot-nginx

    Create the VirtualHost

    We need to create this file: /etc/nginx/sites-available/

    # Upstreams
    upstream backend {
    # HTTP Server
    server {
        listen 80;
        error_log /var/log/nginx/rocketchat.access.log;
        location / {
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            proxy_set_header Host $http_host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forward-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forward-Proto http;
            proxy_set_header X-Nginx-Proxy true;
            proxy_redirect off;

    Enable the VirtualHost:

    cd /etc/nginx/sites-enabled/
    ln -s ../sites-available/
    systemctl reload nginx

    Generate the certificate

    certbot --nginx run -d
    • Enter email address:
    • Agree to the ToS
    • Enforce HTTPS: Secure

    The VirtualHost file (/etc/nginx/sites-available/ should look like this after the creation of the Let’s Encrypt certificate:

    # Upstreams
    upstream backend {
    server {
        listen 80;
        error_log /var/log/nginx/rocketchat.access.log;
        location / {
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            proxy_set_header Host $http_host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forward-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forward-Proto http;
            proxy_set_header X-Nginx-Proxy true;
            proxy_redirect off;
        listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/; # managed by Certbot
    ssl_session_cache shared:le_nginx_SSL:1m; # managed by Certbot
    ssl_session_timeout 1440m; # managed by Certbot
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # managed by Certbot
    ssl_prefer_server_ciphers on; # managed by Certbot
        if ($scheme != "https") {
            return 301 https://$host$request_uri;
        } # managed by Certbot

    Now visit the website to test it: (it should redirect you to

    Creating an admin account

    Register a new account. You will get this warning:

    WARNING: the setting site URL is configured to http://localhost and you are accessing from do you want to change to

    You should ofcourse answer ‘Yes’.

    This first user created is an admin user. You can set global preferences from Now users can visit the website and register with it. You may wish to Allow Notifications when you are prompted by your browser on your first visit to the site. Rocket.Chat supports many other authentication backends, including LDAP which is described in the next step.

    Besides the web service you can also download native applications for Linux, Windows, Mac OS X, Android and iOS.

    Configure LDAP

    This is an optional step, but recommended if your organization has an LDAP or Active Directory setup. In this example we are using the Fusiondirectory setup from our previous guide.

    Create a service account for, using the DSA module of Fusiondirectory:

    • Username: cn=rocketchat,ou=dsa,dc=example,dc=com
    • Password: MySecretCombination

    Now go to using an admin account and set these:

    • Enable: True
    • Login Fallback: True
    • Host:
    • Port: 389
    • Encryption: StartTLS
    • CA Cert: Paste the contents of your internal ROOT CA certificate ( for example)
    • Reject Unauthorized: True
    • Domain Base: ou=people,dc=example,dc=com
    • Use Custom Domain Search: False
    • Domain Search User: cn=rocketchat,ou=dsa,example,dc=com
    • Domain Search Password: MySecretCombination
    • Domain Search User ID: uid
    • Domain Search Object Class: person
    • Domain Search Object Category: Leave Empty
    • Username Field: Leave Empty

    Leave the default settings for the rest and press the SAVE CHANGES button

    You can use the TEST CONNECTION button to test the connection.

    You can now try to login using your LDAP username and password.



    Installing the Exodus MOD on OnePlus 2

    Less than a year ago I was attracted by the value for money offer of OnePlus 2 and became a proud owner. Being paranoid about Google tracking, I disabled most Google apps. Alas, some apps were impossible to disable. I assumed that this was caused by their dependencies with other core applications. Google play services was one them, but I never created an account with Google and never synced anything with them.

    Time went by and it happened that data over mobile was accidentally enabled. And then I noticed from the mobile data traffic statistics, that Google Play services was creating traffic even without a Google account! Why does this happens its beyond my perception, but anyone is allowed to guess based on [recent history]( "PRISM Surveillance program"). There is an option to disable background traffic on the stock Android ROM (OxygenOS) but that works only when data over mobile is enabled. With Wi-Fi enabled, Google Play services keeps on sending suspicious traffic, back to mother Google.

    So I decided to look for alternatives to replace OxygenOS with a Google-free Android ROM. These are the options I have investigated:

    • Replicant:
      This seems to be the more privacy respecting Android MOD. No support for OnePlus 2, alas!
    • AOKP:
      This is an interesting MOD with lots of features. There are recent nightly builds for OnePlus 2. I tried to install it my Phone but gave an error when I tried to sideload it.
    • CyanogenMOD:
      A popular Android MOD that was recently discontinued. A fork by the name LineageOS is taking over. No image downloads yet.<br />
      UPDATE (2-Jan-2016): There are some experimental LineageOS images here.
    • Paranoid Android:
      Another successful Android MOD with close ties to OnePlus. It boasts some interesting features. Officially supports all OnePlus models except the latest OnePlus 3T. I tried the OnePlus 2 image but the phone stack to the OnePlus logo boot screen.
    • Exodus:
      This is a minimalistic Android MOD. It is based on AOSP and is free from Google Apps. This is the only MOD I managed to get it working on my OnePlus 2.

    So I decided to go with Exodus. This guide describes the procedure and preparations I followed in order to flash the latest Exodus nightly build for OnePlus 2.

    DISCLAIMER: This guide could renter your device a luxurious brick! Backup everything before you continue. The author of this guide will not be liable for any damages you may cause on your device or any data lost. Proceed at your own risk!

    Now we got that out of the way, let’s continue.


    • A PC. In this guide we are using Debian/Ubuntu as the PC’s Operating System but this can work with other Operating Systems, with minor adaptations.
    • An OnePlus 2 smartphone. It could possibly be used for other devices too, but I have only tested this on OnePlus 2.
    • The Android Debug Bridge (ADB). This is part of the Android SDK. On Debian/Ubuntu you can install it with apt install android-tools-adb.
    • A Type-C USB cable to connect the phone to your PC.

    Make your device detectable in Linux

    There is some process we need to follow so that the OnePlus 2 device is detectable by ADB

    Enable Usb Debugging

    To Enable USB Debugging we need to first enable the Developer Options:

    • Go into Settings
    • Dive into the About phone option
    • Tap 7 times on the Build number option
    • Go back and tap on Developer Options
    • Enable USB debugging and OEM unlock

    Enable detection of device under Linux

    First ensure that the device is connected:

    # lsusb
     Bus 003 Device 039: ID 2a70:f003  

    The device ID for OnePlus 2 is 0x2a70. Set this in * ~/.android/adb_usb.ini*:

    # echo "0x2a70" >> ~/.android/adb_usb.ini

    Download the udev rules files (Thanks Nicolas Bernaerts):

    # wget --header='Accept-Encoding:none' -O /etc/udev/rules.d/51-android.rules
    # chmod a+r /etc/udev/rules.d/51-android.rules
    # wget --header='Accept-Encoding:none' -O /etc/udev/rules.d/69-mtp.rules
    # chmod a+r /etc/udev/rules.d/69-mtp.rules

    Restart the udev and ADB services:

    # systemctl restart udev
    # adb kill-server
    # adb start-server

    NOTE: make sure USB Debugging is enabled otherwise you will still not be able to see the device!

    Verify that the device is present:

    # adb devices 
    List of devices attached 
    da0afea7        unauthorized

    Seems OK.

    Backup your data and stock image

    Since we are not using Google’s services we will need to manually backup all important data such as:

    • Export contacts on a .vcf file.
    • Save Pictures and Videos from the phone on your PC
    • Backup every other Applacation data which is important to you.

    You can also backup your entire system with ADB:

    # adb backup -f oneplus2.bck -apk -shared -all

    This will take some time depending on the size of your data.

    You can later restore your system back to normal, using this command:

    # adb restore oneplus2.bck

    Prepare the recovery image

    Download Prepare the First Aid kit

    This is a bundle that includes all the files needed to bring life to a bricked OnePlus 2 device. It includes a recovery image which we will use to install Exodus (or any other image you wish) on the device.

    # wget -O ''
    # unzip

    All the necessary files are in the newly created, Firstaid directory.

    Download TWRP Custom recovery

    The recovery image that comes with Firstaid is somewhat outdated. We will download a more recent version of it and replace it in the Firstaid directory. You can download the more recent TWRP image from here. Do not use wget or other command line tools, just a normal browser to download it.

    NOTE: There are more recent versions than 3.0.2-0 like 3.0.2-1 and 3.0.2-2. You can try those if you feel lucky, but be warned! Those versions did not work on my phone. You can see all the past and resent images here.

    Verify the downloaded image:

    # wget -O twrp-public.asc
    # gpg --import twrp-public.asc
    # wget
    # gpg --verify twrp-3.0.2-0-oneplus2.img.asc twrp-3.0.2-0-oneplus2.img

    If you get Good signature from &quot;TeamWin &lt;admin>&quot; that means the image is correct. Now replace the TWRP image that comes with Firstaid with this one:

    # cp twrp-3.0.2-0-oneplus2.img Firstaid/twrp.img

    Flash the recovery image

    Reboot to fastboot mode:

    # adb reboot-bootloader

    Alternatively you can poweroff the OnePlus 2 and press the Volume UP + Power buttons simultaneously.

    Verify the presence of the device:

    # fastboot devices
    da0afea7               fastboot

    Unlock the phone:

    fastboot oem unlock

    Flash Firstaid with the recent TWRP recovery image:

    # cd Firstaid
    # ./

    Now unplug the phone from the PC, poweroff and the press the Volume DOWN + Power buttons simultaneously. This will bring your phone into TWRP recovery.

    Flashing the Exodus image

    Download Exodus image and verify

    Download the latest Exodus image for OnePlus 2 here:

    # wget
    # wget 

    Verify that the download is correct:

    # cat ; md5sum
    35dcf9ea73648682a36e673f5ed8f0eb  /android/exodus-6.0/out/target/product/oneplus2/

    Seems OK

    Plug the phone back to the PC and ensure that it is detectable by ADB:

    # adb devices 
    List of devices attached 
    da0afea7        device

    Flash the Exodus image

    Follow these steps:

    • Wipe old data: Select Wipe and then Swipe to Factory Reset. You may need to format the system if the previous system was encrypted.
    • Enter the Sideload mode: From the TWRP start menu select Advanced then ADB Sideload and then Swipe to Start Sideload
    • From the PC’s CLI run the following command:
    # adb sideload

    Wait and then reboot into the new Exodus system when done.

    Optional steps

    Install F-Droid:

    By default Exodus has a minimal set of apps. Since we are not using Google Apps we will need to install F-Droid:

    # wget
    # adb install FDroid.apk

    Lock your Phone

    Setup a PIN or Pattern to lock the screen of your phone when not in use: Settings -> Security -> Screen Lock. Avoid fingerprint as it can be easily bypassed.

    Encrypt phone

    Encrypting your phone will protect your data if it gets stolen or confiscated. These are the steps Settings -> Security -> Encrypt phone. Your phone will need to be plugged to charger and charged to 80% or above, otherwise the system will refuse to start the encryption process.

    Restoring the Stock OxygenOS System

    If you decide that you don’t like Exodus or any other MOD that you have installed, you can restore your phone back to the stock OxygenOS. These instructions can also be used to restore your phone’s functionality after you have accidentally bricked it.

    Download necessary images

    Download the stock OxygenOS 3.0.2 image from here. Verify the download with:

    # echo 46b1fde116275d83d05c2dd89422069f ; md5sum

    Download the upgrade patch for Oxygen 3.1.0 from here. Verify the download with:

    # echo 9cfa9a2a4c7fada6f9db79ea660251d0 ; md5sum 

    Optionally you can download the SuperSU image if you would like your OxygenOS rooted:

    # wget -O ''

    Flash Recover image

    First we need to restore the recovery ROM from Firstaid:

    # cd Firstaid
    # ./

    Flash the Oxygen Images.

    Before we install the OxygenOS image it is recommended to wipe the phone: From the TWRP menu select Wipe and then Swipe to factory reset. If the system was previously encrypted you will need to use TWRP to format it before the wipe.

    Then we need to set the device into Sideload mode: Select Advanced -> ADB Sideload -> Swipe to Start Sideload.

    First install the OxygenOS 3.0.2 image:

    adb sideload

    Then re-enable ADB Sideload and load the Oxygen 3.2.0 patch:

    adb sideload

    Optionally you can also load the SuperSU application as well

    adb sideload

    Finally reboot into the new system and enjoy your freshly formatted phone.



    Creating an authoritative-only DNS system for your domain

    Most registrars they provide a DNS service when you purchase a domain name. But having your own DNS servers means more control to you. And if you are an aspiring sysadmin, you will find it fun and educational. We will be using BIND 9 which is, by far the most popular DNS implementation.


    We will need two systems (VMs or containers) preferably on different geographic locations and different providers. One will be the master and the other system, the slave. This guide works for recent Debian or Ubuntu systems.

    Some assumptions:

    • Master DNS:
      • Hostname:
      • IP:
    • Slave DNS:
      • Hostname:
      • IP:
    • Webserver:
      • Hostname: ( is an alias)
      • IP:
    • Main mailserver:
      • Hostname: ({mail,smtp,pop,imap,webmail} are aliases)
      • IP:
    • Backup mailserver:
      • Hostname:
      • IP:


    Setup the /etc/hosts file

    On master’s /etc/hosts: ns1

    On slave’s /etc/hosts: ns2

    Installing BIND

    NOTE: all commands must be applied to both master and slave unless otherwise stated

    apt-get -y install bind9 bind9utils

    Allow port 53:

    ufw allow 53

    Configure the global options

    Make the following changes in the /etc/bind/named.conf.options of both servers:

    --- /etc/bind/named.conf.options        2016-12-12 14:44:57.163515708 -0500
    +++ /etc/bind/    2016-12-12 14:52:29.749268250 -0500
    @@ -1,5 +1,7 @@
     options {
            directory "/var/cache/bind";
    +       recursion no;
    +       allow-transfer { none; };
            // If there is a firewall between you and nameservers you want
            // to talk to, you may need to fix the firewall to allow multiple

    Configure the local options

    On master’s /etc/bind/named.conf.local:

    --- /etc/bind/named.conf.local  2016-12-12 20:06:27.000000000 +0000
    +++ /etc/bind/      2016-12-12 20:07:03.000000000 +0000
    @@ -6,3 +6,8 @@
     // organization
     //include "/etc/bind/zones.rfc1918";
    +zone "" {
    +    type master;
    +    file "/etc/bind/";
    +    allow-transfer {; };

    On slave’s /etc/bind/named.conf.local:

    --- /etc/bind/named.conf.local  2016-11-01 13:02:24.000000000 -0400
    +++ /etc/bind/      2016-12-12 15:09:47.445235343 -0500
    @@ -6,3 +6,8 @@
     // organization
     //include "/etc/bind/zones.rfc1918";
    +zone "" {
    +    type slave;
    +    file "";
    +    masters {; };

    Create the zone file

    On master server create the zone file (/etc/bind/

    $TTL 3600
    @    IN    SOA (
                                                180 )
    ; NS Records
    @       300    IN      NS    
    @       300    IN      NS    
    ; MX Records
    @       300    IN      MX      10
    @       300    IN      MX      20
    ; Address records
    @       300    IN      A     
    ns1     300    IN      A     
    ns2     300    IN      A     
    mx1     300    IN      A     
    mx1     300    IN      A     
    ; Alias (Canonical Name) records
    www     300    IN      CNAME 
    mail    300    IN      CNAME 
    smtp    300    IN      CNAME 
    imap    300    IN      CNAME 
    pop     300    IN      CNAME 
    webmail 300    IN      CNAME 
    ; TXT records
    @       300    IN      TXT             "v=spf1 a mx ?all"

    Verify the global configuration

    Run the named-checkconf command on both servers. If you get any errors you should fix them before proceeding.

    Verify the zone configuration

    Run the following command on the master server:

    named-checkzone /etc/bind/ 
    zone loaded serial 2016121201

    If you get ‘OK’ then your setup is correct, otherwise you should fix it before proceeding.

    Restart bind and test your servers

    systemctl restart bind9.service

    Now test if your servers resolve your records.

    The master:

    dig @
    ;; ANSWER SECTION:   300 IN  CNAME    300 IN  A

    The slave:

    dig @
    ;; ANSWER SECTION:   300 IN  CNAME    300 IN  A

    If you get any errors you can check your syslog file (/var/log/syslog).


    After you have tested that everything is OK, it is time to tell your registrar about the new servers. This is called setting the glue records and you should consult the documentation of your registrar on how to do that. Ask support if you have any trouble.



    Setting up a Postfix/Dovecot mail system with an LDAP/Fusiondirectory backend

    This guide is about setting up a Postfix/Dovecot system using LDAP/Fusiondirectoory as a backend.


    • Install an LDAP/Fusiondirectory infrastructure
    • A DNS A Record: 300 IN A
    • A DNS PTR Record: 300 IN PTR
    • A DNS MX Record (Actually more than one): 300 IN MX 5

    Install FusionDirectory Plugins

    • Install the Mail plugin:
      apt -y install fusiondirectory-plugin-mail fusiondirectory-plugin-mail-schema
      fusiondirectory-insert-schema -i /etc/ldap/schema/fusiondirectory/mail-fd.schema
      fusiondirectory-insert-schema -i /etc/ldap/schema/fusiondirectory/mail-fd-conf.schema
    • Install the Alias plugin:
      apt -y install fusiondirectory-plugin-alias fusiondirectory-plugin-alias-schema
      fusiondirectory-insert-schema -i /etc/ldap/schema/fusiondirectory/alias-fd-conf.schema
      fusiondirectory-insert-schema -i /etc/ldap/schema/fusiondirectory/alias-fd.schema
    • Install the Postfix plugin:
      apt -y install fusiondirectory-plugin-postfix fusiondirectory-plugin-postfix-schema
      fusiondirectory-insert-schema -i /etc/ldap/schema/fusiondirectory/postfix-fd.schema

    Setup mail services:

    • Enter the server configuration (Systems plugin)
    • From the ‘Services’ tab create a ‘Postfix (SMTP)’ and an ‘IMAP/POP3 generic’ service

    • Add mail capability to all normal users:

      • Click the ‘Mail’ tab of a user and then press ‘Add Mail settings’
    • Fill in the ‘Primary Address. field and select as the server.

  • Add All necessary distribution lists and redirections from ‘Aliases’

  • Setup postfix

    • Create a service account for postfix using the ‘DSA’ plugin in *FusionDirectory’. It should look like this:

      dn: cn=postfix,ou=dsa,dc=example,dc=com
      cn: postfix
      userPassword:: yeduyt2732tet87eoiewoi32t4873t4387f7gf47gf49i6=
      structuralObjectClass: organizationalRole
      entryUUID: 280427ce-9a54-1035-8e48-bf1fd814366b
      creatorsName: cn=admin,dc=example,dc=com
      createTimestamp: 20160419082627Z
      objectClass: organizationalRole
      objectClass: top
      objectClass: simpleSecurityObject
      entryCSN: 20160419082628.006263Z#000000#000#000000
      modifiersName: cn=admin,dc=example,dc=com
      modifyTimestamp: 20160419082628Z

    • Install postfix:
      apt -y install postfix postfix-pcre postfix-ldap

      When you are prompted about "General type of mail configuration:" select "No configuration"

    • Prepare the /etc/postfix/ file:

    smtpd_banner = $myhostname ESMTP $mail_name
    biff = no
    append_dot_mydomain = no
    readme_directory = no
    smtpd_tls_security_level = may
    smtpd_tls_auth_only = yes
    smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
    smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
    smtpd_tls_dh512_param_file = ${config_directory}/certs/dh_512.pem
    smtpd_tls_dh1024_param_file = ${config_directory}/certs/dh_1024.pem
    tls_random_source = dev:/dev/urandom
    smtpd_tls_loglevel = 0
    smtpd_client_new_tls_session_rate_limit = 10
    smtpd_tls_exclude_ciphers =
    myhostname =
    alias_maps = hash:/etc/aliases
    alias_database = hash:/etc/aliases
    myorigin = /etc/mailname
    mydestination = $myhostname,, localhost.localdomain, localhost
    relayhost =
    mynetworks = [::ffff:]/104 [::1]/128
    mailbox_size_limit = 0
    recipient_delimiter = +
    inet_interfaces = all
    inet_protocols = all
    local_transport = local
    postscreen_greet_action = enforce
    smtpd_recipient_restrictions =
        warn_if_reject reject_non_fqdn_hostname
        warn_if_reject reject_non_fqdn_sender
        check_sender_ns_access cidr:/etc/postfix/drop.cidr
        check_sender_mx_access cidr:/etc/postfix/drop.cidr
    smtpd_data_restrictions = reject_multi_recipient_bounce
    smtpd_sender_restrictions =
    smtpd_helo_restrictions =
        check_helo_access pcre:/etc/postfix/identitycheck.pcre
    disable_vrfy_command = yes
    smtpd_helo_required = yes
    smtpd_delay_reject = no
    smtpd_client_restrictions = check_client_access cidr:/etc/postfix/drop.cidr
    message_size_limit = 51200000
    • Prepare the rest of the configuration files:

      • Prepare the virtual domains file:
        cat > /etc/postfix/virtual_domains &lt; &lt; EOF
         # Domain                Anything
      • Prepare the virtual recipients file:
        cat > /etc/postfix/ &lt; &lt; EOF
        bind = yes
        bind_dn = cn=postfix,ou=dsa,dc=example,dc=com
        bind_pw = NotTheRealPassword
        server_host = ldap://
        search_base = ou=people,dc=example,dc=com
        domain =
        query_filter = (mail=%s)
        result_attribute = mail
        start_tls = yes
        version = 3
      • Prepare the virtual aliases file:
        cat > /etc/postfix/ < < EOF
        bind = yes
        bind_dn = cn=postfix,ou=dsa,dc=example,dc=com
        bind_pw = NotTheRealPass
        server_host = ldap://
        search_base = ou=alias,dc=example,dc=com
        domain =
        query_filter = (mail=%s)
        result_attribute = gosaMailAlternateAddress, gosaMailForwardingAddress
        start_tls = yes
        version = 3
      • Prepare the identity check file:
        cat > /etc/postfix/identitycheck.pcre &lt; &lt; EOF
        # Identity (RegEx)              Action
        /^(mail\.example\.com)$/       REJECT Hostname Abuse: $1
        /^(1\.2\.3\.4)$/                REJECT Hostname Abuse: $1
        /^(\[1\.2\.3\.4\])$/            REJECT Hostname Abuse: $1
      • Prepare the blacklist file:
        cat > /etc/postfix/drop.cidr &lt; &lt; EOF
        # IP/CIDR                       Action
                             REJECT Blacklisted
    • Generate the virtual domains hashmap:
      postmap hash:/etc/postfix/virtual_domains
    • Start postfix:
      systemctl start postfix


      ss -lnptu | grep master
      tcp    LISTEN     0      100    *:25      *:*      users (("master",pid=15539,fd=12))
    • Enable support for smtps (port 465) and submission (port 587):

      Uncomment the following lines from /etc/postfix/

      submission inet n       -       -       -       -       smtpd
      smtps     inet  n       -       -       -       -       smtpd

      Restart postfix:

      systemctl restart postfix


      ss -lnptu | grep master
      tcp    LISTEN     0      100    *:587     *:*      users:(("master",pid=15854,fd=16))
      tcp    LISTEN     0      100    *:465     *:*      users:(("master",pid=15854,fd=19))
      tcp    LISTEN     0      100    *:25      *:*      users:(("master",pid=15854,fd=12))
    • Take precautions for perfect forward secrecy:
      mkdir /etc/postfix/certs
      cd /etc/postfix/certs
      openssl dhparam -2 -out dh_512.pem 512
      openssl dhparam -2 -out dh_1024.pem 1024
      chmod 600 dh_*
    • Lookup test:
      postmap -q ldap:/etc/postfix/
    • Open SMTP, SMTPS ans Submission ports:
      ufw allow 25/tcp
      ufw allow 465/tcp
      ufw allow 587/tcp

    Install and configure dovecot

    • Create a service account for dovecot using the ‘DSA’ plugin in *FusionDirectory’. It should look like this:
      dn: cn=dovecot,ou=dsa,dc=example,dc=com
      cn: dovecot
      userPassword:: ljsdewd98dej932j98dxjud8x3jx9843xj8943j438439e3=
      structuralObjectClass: organizationalRole
      entryUUID: 4d0d7174-9a54-1035-8e49-bf1fd814366b
      creatorsName: cn=admin,dc=example,dc=com
      createTimestamp: 20160419082730Z
      objectClass: organizationalRole
      objectClass: top
      objectClass: simpleSecurityObject
      entryCSN: 20160419082730.138012Z#000000#000#000000
      modifiersName: cn=admin,dc=example,dc=com
      modifyTimestamp: 20160419082730Z
    • Install dovecot:
      apt -y install dovecot-core dovecot-imapd dovecot-pop3d dovecot-lmtpd dovecot-ldap
    • Make the following changes in /etc/dovecot/conf.d/10-ssl.conf:
    ssl = required
    ssl_cert = 
    service imap-login {
      inet_listener imap {
        port = 143
      inet_listener imaps {
        port = 993
        ssl = yes
    service pop3-login {
      inet_listener pop3 {
        port = 110
      inet_listener pop3s {
        port = 995
        ssl = yes
    service auth {
      unix_listener auth-userdb {
        mode = 0777
        user = dovecot
        group = dovecot
    • Add the vmail user in the system:

      addgroup --system --gid 5000 vmail
      adduser --system --home /srv/vmail --uid 5000 --gid 5000 --disabled-password --disabled-login vmail

    • Restart dovecot:
      systemctl restart dovecot


      netstat -lnptu | grep dovecot
      tcp        0      0   *               LISTEN      20894/dovecot   
      tcp        0      0   *               LISTEN      20894/dovecot   
      tcp        0      0   *               LISTEN      20894/dovecot   
      tcp        0      0   *               LISTEN      20894/dovecot   
      tcp6       0      0 :::993                  :::*                    LISTEN      20894/dovecot   
      tcp6       0      0 :::995                  :::*                    LISTEN      20894/dovecot   
      tcp6       0      0 :::110                  :::*                    LISTEN      20894/dovecot   
      tcp6       0      0 :::143                  :::*                    LISTEN      20894/dovecot  
    • Check if you can login:
    openssl s_client -connect localhost:993
    <output ommitted...>
    a1 LOGIN theo MyNotSoSecretPass
    a3 LOGOUT
    * BYE Logging out
    a2 OK Logout completed.
    • Enable IMAP, IMAPS, POP3 and POP3S ports:

      ufw allow 110/tcp
      ufw allow 143/tcp
      ufw allow 993/tcp
      ufw allow 995/tcp

    • Tell postfix to deliver mail using dovecot:
      • Add the following lines at the end of /etc/postfix/
        dovecot   unix  -       n       n       -       -       pipe
          flags=ODRhu user=vmail:vmail argv=/usr/lib/dovecot/deliver -e -f ${sender} -d ${recipient}
      • Add these attributes in /etc/postfix/
        virtual_transport = dovecot
        dovecot_destination_recipient_limit = 1
    • Restart postfix and dovecot:
      systemctl restart postfix dovecot

    Install SASL for SMTP AUTH

    • Create a service account for saslauthd using the ‘DSA’ plugin in *FusionDirectory’. It should look like this:
      dn: cn=saslauthd,ou=dsa,dc=example,dc=com
      cn: saslauthd
      userPassword:: ejdoedoifj9ewufd9843e9ejfd98je938jcr9843843=
      structuralObjectClass: organizationalRole
      entryUUID: 61143234-9a54-1035-8e4a-bf1fd814366b
      creatorsName: cn=admin,dc=example,dc=com
      createTimestamp: 20160419082803Z
      objectClass: organizationalRole
      objectClass: top
      objectClass: simpleSecurityObject
      entryCSN: 20160419082803.738357Z#000000#000#000000
      modifiersName: cn=admin,dc=example,dc=com
      modifyTimestamp: 20160419082803Z
    • Install SASL:
      apt -y install libsasl2-2 sasl2-bin
    • Create the /etc/postfix/sasl/smtpd.conf file:
      cat > /etc/postfix/sasl/smtpd.conf < < EOF
      log_level: 3
      pwcheck_method: saslauthd
      mech_list: PLAIN LOGIN
    • Make the following changes in /etc/default/saslauthd:
      OPTIONS="-c -m /var/spool/postfix/var/run/saslauthd"
    • Create the /etc/saslauthd.conf file:
      cat > /etc/saslauthd.conf < < EOF
      ldap_servers: ldap://
      ldap_bind_dn: cn=saslauthd,ou=dsa,dc=example,dc=com
      ldap_bind_pw: MySecretPass
      ldap_timeout: 10
      ldap_time_limit: 10
      ldap_scope: sub
      ldap_search_base: ou=people,dc=example,dc=com
      ldap_auth_method: bind
      ldap_filter: (&(uid=%u)(mail=*))
      ldap_debug: 0
      ldap_verbose: off
      ldap_ssl: yes
      ldap_starttls: no
      ldap_referrals: yes
    • Add the postfix user in the sasl group:
      usermod -aG sasl postfix
    • Add these attributes in /etc/postfix/
      smtpd_sasl_auth_enable = yes
      broken_sasl_auth_clients = yes
    • Restart saslauthd and postfix:
      systemctl restart saslauthd postfix
    • Test message delivery using SMTP AUTH:

      First you need to install swaks:

      apt -y install swaks

      Then use swaks to test message delivery:

      swaks --from --to --server --tls --auth plain --auth-user=theo
    • Test if the message has been delivered to inbox:

      First you need to install mutt:

      apt -y install mutt

      Then use mutt to test if the message has been delivered to inbox:

      mutt -f /srv/vmail/

      NOTE: When you are asked to create a ‘mail’ folder just say ‘no’.



    Setting up an LDAP directory with a Fusiondirectory frontend

    LDAP/Fusiondirectory setup

    In this guide we will be setting up LDAP (openldap) along with the FusionDirectory web management tool.


    • Install Debian jessie (Ubuntu 16.04 should work too) on your server or VM
    • Setup the DNS records in your DNS servers:           3599    IN      A

      NOTE: replace with you actual internal or external IP

    • Allow ssh and web services on firewall:

      apt -y install ufw
      ufw allow 22/tcp
      ufw allow 80/tcp
      ufw allow 443/tcp
      ufw enable

      NOTE: It may be a good idea to change the default ssh port from 22 to something less predictable

    Setup LDAP

    • Setup in /etc/hosts: ldap
    • Install OpenLDAP and FusionDirectory

      apt -y install slapd

      Enter and verify the administrator password for slapd.

    • Create An Internal Certificate Authority for Example LTD:

      • First install gnutls-bin:
        apt -y install gnutls-bin
      • Create the key for the internal CA for
        certtool --generate-privkey --outfile
      • Create a certificate for our internal CA:
    certtool --generate-self-signed --load-privkey --outfile
    Generating a self signed certificate...
    Please enter the details of the certificate's distinguished name. Just press enter to ignore a field.
    Common name: Example LTD Internal ROOT CA
    Organizational unit name: IT
    Organization name: Example LTD
    Locality name: Limassol
    State or province name: Limassol
    Country name (2 chars): CY
    Enter the subject's domain component (DC): 
    This field should not be used in new certificates.
    Enter the certificate's serial number in decimal (default: 6295758616856773074): 
    The certificate will expire in (days): 7300
    Activation/Expiration time.
    The certificate will expire in (days): 7300
    Does the certificate belong to an authority? (y/N): y
    Path length constraint (decimal, -1 for no constraint): -1
    Is this a TLS web client certificate? (y/N):
    Will the certificate be used for IPsec IKE operations? (y/N): 
    Is this a TLS web server certificate? (y/N): 
    Enter a dnsName of the subject of the certificate: 
    Enter a URI of the subject of the certificate: 
    Enter the IP address of the subject of the certificate: 
    Enter the e-mail of the subject of the certificate: 
    Will the certificate be used to sign other certificates? (y/N): y
    Will the certificate be used to sign CRLs? (y/N): 
    Will the certificate be used to sign code? (y/N): 
    Will the certificate be used to sign OCSP requests? (y/N): 
    Will the certificate be used for time stamping? (y/N):
    Enter the URI of the CRL distribution point: 
    X.509 Certificate Information:
            Version: 3
            Serial Number (hex): 575f071b0d5a41d2
                    Not Before: Mon Jun 13 19:19:27 UTC 2016
                    Not After: Sun Jun 08 19:20:00 UTC 2036
            Subject: CN=Example LTD Internal ROOT CA,OU=IT,O=Example LTD,L=Limassol,ST=Limassol,C=CY,
            Subject Public Key Algorithm: RSA
            Algorithm Security Level: Medium (2048 bits)
                    Modulus (bits 2048):
                    Exponent (bits 24):
                    Basic Constraints (critical):
                            Certificate Authority (CA): TRUE
                    Key Purpose (not critical):
                            Time stamping.
                    Key Usage (critical):
                            Certificate signing.
                    Subject Key Identifier (not critical):
    Other Information:
            Public Key ID:
            Public key's random art:
                    +--[ RSA 2048]----+
                    |                 |
                    |     . .         |
                    |    . . .        |
                    |   o .   .       |
                    | . .+.  S o      |
                    |  =o..o. + . .   |
                    | o.o= .oo . o o  |
                    | oo+.  .o  o o   |
                    |o...  E+   .o    |
    Is the above information ok? (y/N): y
    Signing certificate...
    • Add the Example LTD Internal ROOT CA as trusted in ca-certificates:

      mkdir /usr/share/ca-certificates/extra
      cp /usr/share/ca-certificates/extra
      dpkg-reconfigure ca-certificates

      Add the extra/ CA as a trusted CA.

      • Configure slapd:
      dpkg-reconfigure slapd
      • Omit OpenLDAP server configuration? No
      • DNS domain name:
      • Organization name: Example LTD
      • Administrator password: ***************
      • Verify password: *************
      • Database backend to use: MDB
      • Do you want the database to be removed when slapd is purged? No
      • Move old database? Yes
      • Allow LDAPv2 protocol? No
    • Configure TLS on LDAP:

    • Create a key for

      certtool --generate-privkey --outfile
      Generating a 2048 bit RSA private key...

    • Create a certificate for
    certtool --generate-certificate --load-privkey --outfile --load-ca-certificate --load-ca-privkey
    Generating a signed certificate...
    Please enter the details of the certificate's distinguished name. Just press enter to ignore a field.
    Common name:
    Organizational unit name: IT
    Organization name: Example LTD
    Locality name: Limassol
    State or province name: Limassol
    Country name (2 chars): CY
    Enter the subject's domain component (DC): 
    This field should not be used in new certificates.
    Enter the certificate's serial number in decimal (default: 6295762607454361711):
    Activation/Expiration time.
    The certificate will expire in (days): 3650
    Does the certificate belong to an authority? (y/N): 
    Is this a TLS web client certificate? (y/N): 
    Will the certificate be used for IPsec IKE operations? (y/N): 
    Is this a TLS web server certificate? (y/N): 
    Enter a dnsName of the subject of the certificate: 
    Enter a URI of the subject of the certificate: 
    Enter the IP address of the subject of the certificate: 
    Enter the e-mail of the subject of the certificate: 
    Will the certificate be used for signing (required for TLS)? (Y/n): 
    Will the certificate be used for encryption (not required for TLS)? (Y/n):
    X.509 Certificate Information:
            Version: 3
            Serial Number (hex): 575f0abc2f81186f
                    Not Before: Mon Jun 13 19:35:45 UTC 2016
                    Not After: Thu Jun 11 19:36:29 UTC 2026
            Subject:,OU=IT,O=Example LTD,L=Limassol,ST=Limassol,C=CY,
            Subject Public Key Algorithm: RSA
            Algorithm Security Level: Medium (2048 bits)
                    Modulus (bits 2048):
                    Exponent (bits 24):
                    Basic Constraints (critical):
                            Certificate Authority (CA): FALSE
                    Key Usage (critical):
                            Digital signature.
                            Key encipherment.
                    Subject Key Identifier (not critical):
                    Authority Key Identifier (not critical):
    Other Information:
            Public Key ID:
            Public key's random art:
                    +--[ RSA 2048]----+
                    |                 |
                    |                 |
                    |        .        |
                    |       . +       |
                    |        A =      |
                    |       +Y= .     |
                    |      oo+kk+     |
                    |      iii==o*    |
                    |       .=B**o.   |
    Is the above information ok? (y/N): y
    Signing certificate...
    • Enable LDAPS in /etc/default/slapd:

      SLAPD_SERVICES="ldap:/// ldapi:/// ldaps:///"
      • Copy the certficate and apply permissions
        mkdir /etc/ldap/ssl
        cp /etc/ldap/ssl
        cp /etc/ldap/ssl
        chown -R openldap:openldap /etc/ldap/ssl    /
      • Create an olcSSL.ldif file:
    mkdir /etc/ldap/custom_ldifs/
    cd /etc/ldap/custom_ldifs/<br />
    cat > olcSSL.ldif < < EOF
    dn: cn=config
    changetype: modify
    add: olcTLSCACertificateFile
    olcTLSCACertificateFile: /etc/ssl/certs/ca-certificates.crt
    add: olcTLSCertificateKeyFile
    olcTLSCertificateKeyFile: /etc/ldap/ssl/
    add: olcTLSCertificateFile
    olcTLSCertificateFile: /etc/ldap/ssl/
    • Import the TLS configuration:
    ldapmodify -Y EXTERNAL -H ldapi:/// -f olcSSL.ldif

    Verify with:

    slapcat -n0 | grep -i tls
    olcTLSCACertificateFile: /etc/ssl/certs/ca-certificates.crt
    olcTLSCertificateFile: /etc/ldap/ssl/
    olcTLSCertificateKeyFile: /etc/ldap/ssl/
    • Restart and verify slapd:
      systemctl restart slapd
      netstat -lnptu | grep slapd
      tcp        0      0   *               LISTEN      27665/slapd     
      tcp        0      0   *               LISTEN      27665/slapd     
      tcp6       0      0 :::636                  :::*                    LISTEN      27665/slapd     
      tcp6       0      0 :::389                  :::*                    LISTEN      27665/slapd 

    Setup Apache

    • Install Apache with PHP:
      apt -y install apache2 libapache2-mod-php5 php5-ldap php5-mcrypt php5-intl php-pear

    Setup Let’s Encrypt:

    NOTE: this step is only necessary if you have a public facing service

    • Setup Debian jessie backports:
    cat >> /etc/apt/sources.list < < EOF
    # jessie backports
    deb jessie-backports main
    deb-src jessie-backports main
    • Run apt update
    • Install Let’s Encrypt utility, certbot:
      apt -y install python-certbot-apache -t jessie-backports
    • Generate a certificate for all the domain
      certbot run -d

      In the TUI add the email and agree to the ToS. Use 000-default.conf for now.

  • Download and trust all Let’s Encrypt Root and Intermediate CA certificates:

    for i in {1..4}; do wget$i-cross-signed.pem; done
    cp *.pem /usr/share/ca-certificates/extra/
    for f in *.pem; do cp -- "$f" "/usr/share/ca-certificates/extra/${f%.pem}.crt"; done
    dpkg-reconfigure ca-certificates # Select all the newlly added CA certs

  • Setup FusionDirectory

    • Setup Fusiondirectory Repo:
      gpg --keyserver --recv-key 62B4981F 
      gpg --export -a "Fusiondirectory Archive Manager <contact>" > FD-archive-key
      apt-key add FD-archive-key
      echo '# fusiondirectory repository' > /etc/apt/sources.list.d/fusiondirectory.list
      echo 'deb jessie main' >> /etc/apt/sources.list.d/fusiondirectory.list
      echo 'deb-src jessie main' >> /etc/apt/sources.list.d/fusiondirectory.list
      apt update
    • Install FusionDirectory:
      apt -y install fusiondirectory fusiondirectory-schema
    • Insert core FusionDirectory schemas into *slapd


      fusiondirectory-insert-schema -l
    • Create a Fusiondirectory Apache vhost (/etc/apache2/sites-available/
      <virtualhost *:80>
          Redirect "/" ""
          ErrorLog ${APACHE_LOG_DIR}/ldap-error.log
          CustomLog ${APACHE_LOG_DIR}/ldap-access.log combined
      <ifmodule mod_ssl.c>
          <virtualhost *:443>
                  DocumentRoot /usr/share/fusiondirectory/html
                  ErrorLog ${APACHE_LOG_DIR}/ldap-error.log
                  CustomLog ${APACHE_LOG_DIR}/ldap-access.log combined
                  SSLEngine on
                  SSLCertificateFile      /etc/letsencrypt/live/
                  SSLCertificateKeyFile   /etc/letsencrypt/live/
                  <filesmatch "\.(cgi|shtml|phtml|php)$">
                                  SSLOptions +StdEnvVars
                  <directory /usr/lib/cgi-bin>
                                  SSLOptions +StdEnvVars
                  BrowserMatch "MSIE [2-6]" \
                                  nokeepalive ssl-unclean-shutdown \
                                  downgrade-1.0 force-response-1.0
                  BrowserMatch "MSIE [17-9]" ssl-unclean-shutdown
                  <ifmodule mod_php5.c>
                      php_admin_flag engine on
                      php_admin_flag register_globals off
                      php_admin_flag allow_call_time_pass_reference off
                      php_admin_flag expose_php off
                      php_admin_flag zend.ze1_compatibility_mode off
                      php_admin_flag register_long_arrays off
                      php_admin_value upload_tmp_dir /var/spool/fusiondirectory/
                      php_admin_value session.cookie_lifetime 0
                      #Include /etc/fusiondirectory/fusiondirectory.secrets
                  <directory /usr/share/fusiondirectory/html></directory>
                      Order Allow,Deny
                      # Insert your public IPs here
                      Allow from
                      Allow from
    • Enable mod_ssl, and disable 000-default and default-ssl:
      a2enmod ssl
      a2dissite default-ssl
      a2dissite 000-default
      systemctl restart apache2
    • Setup FusionDirectory:
      • Install optional prerequisities:
        apt -y install php-mdb2
      • Point your Browser to:
      • Create a temporary token for the setup (taken from the first setup webpage):
        echo -n r9l1srnu0rvdeca4k826nq4e05 > /var/cache/fusiondirectory/fusiondirectory.auth 

        Click ‘Next’

      • In the ‘Language setup’ select ‘English’ and press ‘Next’.

      • If everything is ‘OK'(Green) on the ‘Installation check’ click ‘Next’

      • On the ‘LDAP connection setup’:

        • Location name: default
        • Connection URI: ldap://
        • TLS connection: Yes
        • Admin DN: cn=admin(,dc=example,dc=com)
        • Admin password: *************************
        • LDAP schema check:
          • Enable schema validation when logging in: Yes
      • Keep defaults in ‘Look and feel’ except ‘Timezone’:
        • Timezone: America/Los_Angeles
      • Keep all the defaults in ‘Password settings’ except this:
        • Password minimum length: 8
      • In the ‘SSL’ field use these:
        • Key path: /etc/ldap/ssl/
        • Certificate path: /etc/ldap/ssl/
        • CA certificate path: /etc/ssl/certs/ca-certificates.crt

        Click ‘Next’ when done.

      • In the ‘LDAP inspection’ page:

        • Press ‘Migrate’ (twice) in the ‘Inspecting object classes in root object’ option
      • Press ‘Create’ in the ‘Checking for super administrator’ option’, fill the fields, and ‘Apply’ when done:

        • User ID: ldapadmin
        • Password: ***************
        • Password (again): ***************
      • In the ‘Checking for default ACL roles and groups’ field, press ‘Migrate’
    • From the ‘Finish – write the configuration file’, download the configuration file on your PC

    • Copy the configuration file from your PC to

      scp fusiondirectory.conf

    • Apply the correct permissions to the /etc/fusiondirectory/fusiondirectory.conf file:
    fusiondirectory-setup --check-config
    Checking FusionDirectory's config file
    /etc/fusiondirectory/fusiondirectory.conf exists…
    /etc/fusiondirectory/fusiondirectory.conf is not set properly, do you want to fix it ?:  [Yes/No]?
    • Click ‘Next’ when done.
  • Use encrypted passwords in fusiondirectory.conf:

    • Enable the headers module in Apache:
      a2enmod headers
      systemctl restart apache2
    • Encrypt passwords in fusiondirectory.conf:
      fusiondirectory-setup --encrypt-passwords
    • Uncomment the following line in /etc/apache2/sites-available/
      Include /etc/fusiondirectory/fusiondirectory.secrets
    • Restart Apache:
      systemctl restart apache2
    • If everything works as expected remove /etc/fusiondirectory/fusiondirectory.conf.orig
      rm /etc/fusiondirectory/fusiondirectory.conf.orig
  • Allow ‘.’ (dot) in usernames:
    • After everything is set, login as ldapadmin
    • Go to ‘Configuration’
    • Press the ‘Edit’ button at the bottom of the page
    • Un-tick the ‘Strict naming policy’ option and save.
  • Installing essential FusionDirectory plugins

    • Setup LDAP related plugins:
      apt -y install fusiondirectory-plugin-ldapdump fusiondirectory-plugin-ldapmanager
    • Setup the DSA plugin for managing service accounts:
      apt -y install fusiondirectory-plugin-dsa fusiondirectory-plugin-dsa-schema
      fusiondirectory-insert-schema -i /etc/ldap/schema/fusiondirectory/dsa-fd-conf.schema
      • Allow the service accounts to read and write the password. First create the ACL definition:
    cat > /etc/ldap/custom_ldifs/service_accounts_acl.ldif < < EOF
    dn: olcDatabase={1}mdb,cn=config
    changetype: modify
    delete: olcAccess
    add: olcAccess
    olcAccess: {0}to dn.subtree="dc=example,dc=com" attrs=userPassword
      by self write
      by dn.base="cn=admin,dc=example,dc=com" write
      by dn.children="ou=dsa,dc=example,dc=com" write
      by anonymous auth
      by * none
    add: olcAccess
    olcAccess: {1}to dn.subtree="ou=people,dc=example,dc=com"
      by self read
      by dn.base="uid=test.user,ou=people,dc=example,dc=com" write
      by dn.base="cn=admin,dc=example,dc=com" write
      by dn.children="ou=dsa,dc=example,dc=com" read
      by anonymous auth
      by * none
    add: olcAccess
    olcAccess: {2}to attrs=userPassword,shadowLastChange
      by self write
      by anonymous auth
      by dn="cn=admin,dc=example,dc=com" write
      by * none
    add: olcAccess
    olcAccess: {3}to dn.subtree="dc=example,dc=com"
      by self read
      by dn.base="cn=admin,dc=example,dc=com" write
      by dn.children="ou=dsa,dc=example,dc=com" write
      by * none
    add: olcAccess
    olcAccess: {4}to dn.base=""
      by * none

    NOTE: Add two spaces before each ‘by‘ in the ldif above or you will spend endless hours in troubleshooting!

    • Apply the ACL
      ldapadd -c -Y EXTERNAL -H ldapi:/// -f /etc/ldap/custom_ldifs/service_accounts_acl.ldif
      • Setup the Systems plugin:
      apt -y install fusiondirectory-plugin-systems fusiondirectory-plugin-systems-schema
      fusiondirectory-insert-schema -i /etc/ldap/schema/fusiondirectory/service-fd.schema
      fusiondirectory-insert-schema -i /etc/ldap/schema/fusiondirectory/systems-fd-conf.schema
      fusiondirectory-insert-schema -i /etc/ldap/schema/fusiondirectory/systems-fd.schema
      • Setup a new server:
        • Name:
        • Description: Communications Server
        • Location: My Datacenter
        • Base: /
        • IP-address:

        • MAC-address: 04:01:05:d6:63:02
      • From the ‘Services’ tab setup an LDAP service on the server

    You are finished. You can now start connecting services to your LDAP setup like mail or asterisk.



    Building opendmarc for Debian Jessie

    I have been using Skelleton‘s guide1 to setup opendmarc on some mail server I am building.

    My problem is the version of opendmarc that comes with Debian is 1.3.0 and this version has a bug2 which fails to honor the IgnoreAuthenticatedClients directive.

    This is an attempt to build3 the newest version, 1.3.1, for Debian jessie.

    Prepare the environment

    • Install all necessary packages:
      $ sudo apt -y install pbuilder debootstrap devscripts packaging-dev debian-keyring
    • Prepare a Debian jessie build environment:
      $ sudo pbuilder create --debootstrapopts --variant=buildd --mirror --distribution jessie --architecture amd64 --components main --debbuildopts -mJohn Doe \<john\>

    Prepare the Debian environment for opendmarc 1.3.1

    • Download and extract the package:
      $ wget
      $ tar xvzf opendmarc-1.3.1.tar.gz
      $ cd opendmarc-1.3.1/
    • Prepare for Debian packaging:
      $ DEBFULLNAME="John Doe" DEBEMAIL="" dh_make -s -y --createorig
      • Rename the debian folder:
        $ mv debian debian.orig
    • Shamelessly copy *debian/** from the original:
      $ cd /tmp/
      $ apt-get source opendmarc
      $ cd opendmarc-1.3.1+dfsg/
      $ cp -a debian/ ~/opendmarc-1.3.1
    • Optional steps:
      • Change the Author name to yours in debian/control
      • Restore the debian/changelog file:

        $ cp debian.orig/changelog debian/

      • Get rid of the debian.orig folder:
        $ mv debian.orig/ ..
      • Edit the debian/changelog file with dch -e:
        opendmarc (1.3.1-1) unstable; urgency=medium<br />
          * Initial release: To fix the IgnoreAuthenticatedClients issue:
         -- John Doe </john><john>  Fri, 29 Apr 2016 13:43:22 +0300

    Build opendmarc 1.3.1

    • Run pdebuild:
      $ pdebuild
    • You cab find the resultant debs under /var/cache/pbuilder/result/:
      $ ls -la /var/cache/pbuilder/result/
      total 868
      drwxr-xr-x 2 root      root        4096 Απρ  29 13:54 .
      drwxr-xr-x 8 root      root        4096 Απρ  29 12:56 ..
      -rw-r--r-- 1 theodotos theodotos  38534 Απρ  29 13:54 libopendmarc2_1.3.1-1_amd64.deb
      -rw-r--r-- 1 theodotos theodotos  64210 Απρ  29 13:54 libopendmarc-dev_1.3.1-1_amd64.deb
      -rw-r--r-- 1 theodotos theodotos   2348 Απρ  29 13:54 opendmarc_1.3.1-1_amd64.changes
      -rw-r--r-- 1 theodotos theodotos  75890 Απρ  29 13:54 opendmarc_1.3.1-1_amd64.deb
      -rw-rw-r-- 1 theodotos theodotos    846 Απρ  29 13:54 opendmarc_1.3.1-1.dsc
      -rw-r--r-- 1 theodotos theodotos 663859 Απρ  29 13:54 opendmarc_1.3.1-1.tar.gz
      -rw-r--r-- 1 theodotos theodotos  17136 Απρ  29 13:54 rddmarc_1.3.1-1_all.deb

    You can now copy the debs over your mail server and test them.

    Update: I did this before I had discovered that opendmarc 1.3.1 is in Debian jessie backports4. But an interesting drill nevertheless.


    1. ↩︎
    2. ↩︎
    3. ↩︎
    4.</john> ↩︎

    Setup a new Ubuntu or Debian system on the Utilite

    This is a guide to setup a recent Ubuntu system on a Utilite ARM computer, to replace the official Ubuntu 12.04 OS.


    • You need to prepare a [kernel with cgroups](/?p=1073 "Building a new Linux kernel for your Utilite Computer") support.
    • An ARM bootable microSD or USB. You can use the official Ubuntu 12.04 [Linux Utilite Image]( "Linux Utilite Image") on the removable device.
    • Backup any data you have on the original system!


    1. Boot from microSD or USB.
    2. Update the system and install debootstrap:

      $ sudo apt-get update
      $ sudo apt-get install debootstrap

    3. Mount the SATA root filesystem on /mnt:
      $ sudo mount /dev/sda2 /mnt
    4. Clear the filesystem:

      Make sure you save any data you need, before doing this!.

      $ sudo rm -fr /mnt/*

    Installation of an Ubuntu or Debian base system

    1. Use debootstrap to install the Ubuntu base system:
      $ sudo debootstrap --foreign --arch=armhf trusty /mnt

      You can use vivid instead of trusty if you are feeling adventurous.

      For a Debian system use this command instead:

      $ sudo debootstrap --foreign --arch armhf jessie /mnt

      You can use stretch or sid instead of jessie if you are feeling lucky.

    2. Chroot into the new system:

      $ sudo mount -o bind /dev /mnt/dev
      $ sudo mount -o bind /dev/pts /mnt/dev/pts
      $ sudo mount -t sysfs /sys /mnt/sys
      $ sudo mount -t proc /proc /mnt/proc
      $ sudo cp /proc/mounts /mnt/etc/mtab
      $ sudo chroot /mnt

    3. Second stage debootstrap:

      After you enter the chroot jail, we need to complete the second stage of the base setup:

      # /debootstrap/debootstrap --second-stage

    Installing additional packages

    1. Setup the correct timezone:
      # dpkg-reconfigure tzdata
    2. Add repositories in /etc/apt/sources.list.
    • For Ubuntu:

      deb trusty main restricted universe multiverse
      deb trusty-security main restricted universe multiverse
      deb trusty-updates main restricted universe multiverse
      deb trusty-backports main restricted universe multiverse
      deb-src trusty main restricted universe multiverse
      deb-src trusty-security main restricted universe multiverse
      deb-src trusty-updates main restricted universe multiverse
      deb-src trusty-backports main restricted universe multiverse

    • For Debian:
      deb jessie main contrib non-free
      deb jessie-updates main contrib non-free
      deb jessie/updates main contrib non-free
      deb-src jessie main contrib non-free
      deb-src jessie-updates main contrib non-free
      deb-src jessie/updates main contrib non-free
    • Run update after adding the repositories:
      # apt-get update
    1. Install additional software.
    • We need to create a fake /sbin/initctl to prevent apt from breaking:
      # dpkg-divert --local --rename --add /sbin/initctl
      # ln -s /bin/true /sbin/initctl
    • Install the software you need:
      # apt-get -y install language-pack-en ssh isc-dhcp-client net-tools man lsof less
    • Remove the fake /sbin/initctl:
      # rm /sbin/initctl
      # dpkg-divert --local --rename --remove /sbin/initctl
    1. Setup users:
      # passwd root
      # useradd -m -s /bin/bash utilite
      # passwd utilite
      # usermod -a -G adm,cdrom,sudo,dip,plugdev utilite
    2. Setup a kernel:

      Now you need to deploy the [kernel we prepare earlier](/?p=1073#toc-deploy-the-tarball "Building a new Linux kernel for your Utilite Computer") and reboot.

    Choose a role for your system

    1. After you reboot you may find that networking is not working. If you are in a dhcp enabled network run dhclient to get an IP address:

      # dhclient

    2. Upgrade the system to the latest upgrades:
      # apt-get update
      # apt-get -y dist-upgrade
    3. Check the available roles
    • On Ubuntu you may want to install tasksel (already installed on Debian):

      # apt-get install tasksel

    • See the available roles on Ubuntu:

      # tasksel --list-tasks
      i server Basic Ubuntu server
      i openssh-server OpenSSH server
      u dns-server DNS server
      u lamp-server LAMP server
      u mail-server Mail server
      u postgresql-server PostgreSQL database
      u print-server Print server
      u samba-server Samba file server
      u tomcat-server Tomcat Java server
      u cloud-image Ubuntu Cloud Image (instance)
      u virt-host Virtual Machine host
      u ubuntustudio-graphics 2D/3D creation and editing suite
      u ubuntustudio-audio Audio recording and editing suite
      u edubuntu-desktop-gnome Edubuntu desktop
      u kubuntu-active Kubuntu Active
      u kubuntu-desktop Kubuntu desktop
      u kubuntu-full Kubuntu full
      u ubuntustudio-font-meta Large selection of font packages
      u lubuntu-desktop Lubuntu Desktop
      u lubuntu-core Lubuntu minimal installation
      u mythbuntu-frontend Mythbuntu frontend
      u mythbuntu-backend-master Mythbuntu master backend
      u mythbuntu-backend-slave Mythbuntu slave backend
      u ubuntustudio-photography Photograph touchup and editing suite
      u ubuntustudio-publishing Publishing applications
      u ubuntu-gnome-desktop Ubuntu GNOME desktop
      u ubuntu-desktop Ubuntu desktop
      u ubuntu-usb Ubuntu desktop USB
      u ubuntustudio-video Video creation and editing suite
      u xubuntu-desktop Xubuntu desktop
      u edubuntu-dvd-live Edubuntu live DVD
      u kubuntu-active-live Kubuntu Active Remix live CD
      u kubuntu-live Kubuntu live CD
      u kubuntu-dvd-live Kubuntu live DVD
      u lubuntu-live Lubuntu live CD
      u ubuntu-gnome-live Ubuntu GNOME live CD
      u ubuntustudio-dvd-live Ubuntu Studio live DVD
      u ubuntu-live Ubuntu live CD
      u ubuntu-usb-live Ubuntu live USB
      u xubuntu-live Xubuntu live CD
      u manual Manual package selection

    • See the available roles on debian:

      $ tasksel --list-tasks
      i desktop   Debian desktop environment
      u gnome-desktop GNOME
      u xfce-desktop  Xfce
      u kde-desktop   KDE
      u cinnamon-desktop  Cinnamon
      u mate-desktop  MATE
      i lxde-desktop  LXDE
      u web-server    web server
      u print-server  print server
      u ssh-server    SSH server
      u laptop    laptop

    1. Choose a role.

      If you would like a Desktop system, I suggest you choose something light like lubuntu-desktop or lxde-desktop.

    • Installing Lubuntu (Ubuntu):

      # tasksel --task-packages lubuntu-desktop | xargs apt-get -y install

      I prefer this method rather than the [TUI]( "Text-based User Interface") of tasksel, so as to have better overview and control of the process. Keep an eye on it every now and then, because it will ask you about keyboard-configuration and other questions. Select the default settings if you are unsure.

    • Installing LXDE Desktop (Debian):

      # apt-get install task-lxde-desktop network-manager

      For Desktop systems it may be a good idea to install network-manager as well.

    • Add the vivante GPU module on startup:

      # echo vivante >> /etc/modules

    After you finish you can reboot your system and start playing.



    Creating a new Debian package using pbuilder: gnujump

    Yet another practical packaging session, this ine on how to build a Debian package from scratch. This one too is based on the packaging tutorial and practical sessions of Lucas Nussbaum.

    We are going to download the source code of gnujump from upstream, and use the pbuilder tool to package it. The advantages of pbuider is that it creates a minimal chroot jail that helps you track any dependencies you might forgot to specify in debian/control. Also it gives you the opportunity to build Debian packages on Ubuntu and vice-versa. You can also build packages for releases other than your own.


    • A recent Debian or Ubuntu system.

    Preparation of the pbuilder jail

    Install pbuilder and relevant packages:

    $ sudo apt-get -y install pbuilder debootstrap devscripts packaging-dev debian-keyring ubuntu-archive-keyring

    NOTE: use ubuntu-keyring instead of ubuntu-archive-keyring if your build station is Ubuntu

    Prepare the target environment. For example for Ubuntu trusty use can use this setup:

    $ sudo pbuilder create --debootstrapopts --variant=buildd --mirror --distribution trusty --architecture amd64 --components main --debbuildopts -mJohn Doe <>

    Prepare the new package

    1. Download the source:
      $ wget
    2. Extract the archive and change into the source tree:
      $ tar xvzf gnujump-1.0.8.tar.gz
      $ cd gnujump-1.0.8/

    Prepare for debian packaging

    1. We are going to use the dh_make utility to prepare the debian directory and all the necessary files:
      $ DEBFULLNAME="John Doe" DEBEMAIL="" dh_make -s -y --createorig

      Check if all necessary files are there:

      $ find debian/

      Now Check the contents of the debian/changelog, debian/rules and debian/control files.

    2. We will need to make some changes in the debian/control file:

      Source: gnujump
      Section: games
      Priority: optional
      Maintainer: John Doe <john>
      Build-Depends: debhelper (>= 9), autotools-dev, libsdl1.2-dev, libsdl-image1.2-dev, libsdl-mixer1.2-dev
      Standards-Version: 3.9.5

      The libsdl1.2-dev, libsdl-image1.2-dev and libsdl-mixer1.2-dev have been discovered by repeatedly compiling and failing until you get it right. The you can use the apt-cache search and apt-file search commands to discover the packages corresponding to the missing dependencies.

    3. Edit the debian/rules file to look like this:

      DH_VERBOSE = 1
      include /usr/share/dpkg/
      export DEB_BUILD_MAINT_OPTIONS = hardening=+all
      export DEB_CFLAGS_MAINT_APPEND  = -Wall -pedantic
      export DEB_LDFLAGS_MAINT_APPEND = -Wl,--as-needed
              dh $@  --with autotools-dev
      CFLAGS += -lm

    4. Edit the debian/changelog, with dch -e, to look like this:
      gnujump (1.0.8-1) unstable; urgency=low
        * Initial release
       -- John Doe</john><john>  Mon, 22 Jun 2015 17:41:22 +0300

    Build the package

    Run this command from the source tree:

    $ pdebuild

    Give your password when asked. pdebuild will download and install all dependencies in the pbuilder jail and then build the package. Changes will be lost from the jail, the next time you use it but if all goes well, you should see these files under /var/cache/pbuilder/result:

    $ ls -la /var/cache/pbuilder/result/
    total 5776
    drwxr-xr-x 2 root      root         4096 Ιούν 22 17:52 .
    drwxr-xr-x 9 root      root         4096 Ιούν 22 11:26 ..
    -rw-r--r-- 1 john john    1449 Ιούν 22 17:52 gnujump_1.0.8-1_amd64.changes
    -rw-r--r-- 1 john john 1560574 Ιούν 22 17:52 <strong>gnujump_1.0.8-1_amd64.deb</strong>
    -rw-rw-r-- 1 john john    9228 Ιούν 22 17:52 gnujump_1.0.8-1.debian.tar.xz
    -rw-rw-r-- 1 john john     885 Ιούν 22 17:52 gnujump_1.0.8-1.dsc
    -rw-rw-r-- 1 john john 2508641 Ιούλ 24  2012 gnujump_1.0.8.orig.tar.gz
    -rw-rw-r-- 1 john john 1814056 Ιούν 22 17:41 gnujump_1.0.8.orig.tar.xz

    Checking the result

    1. View the information related to the package file:
      $ dpkg -I /var/cache/pbuilder/result/gnujump_1.0.8-1_amd64.deb
      new debian package, version 2.0.
      size 1560574 bytes: control archive=5550 bytes.
          419 bytes,    11 lines      control              
        18390 bytes,   233 lines      md5sums              
      Package: gnujump
      Version: 1.0.8-1
      Architecture: amd64
      Maintainer: John Doe </john><john>
      Installed-Size: 2355
      Depends: libc6 (>= 2.14), libgl1-mesa-glx | libgl1, libsdl-image1.2 (>= 1.2.10), libsdl-mixer1.2, libsdl1.2debian (>= 1.2.11)
      Section: games
      Priority: optional
      Description: <insert up to 60 chars description>
       </insert><insert long description, indented with spaces>

    As you can see our work is not finished. We need to add a description in debian/control and rebuild it.

    1. Check the contents of the package file:
      $ dpkg -I /var/cache/pbuilder/result/gnujump_1.0.8-1_amd64.deb

    Install the package

    Now we can install the package:

    $ sudo dpkg -i /var/cache/pbuilder/result/gnujump_1.0.8-1_amd64.deb

    Now run the gnujump software and check if it works.

    This is not the whole story of course. You have to check the package against Lintian to see if it complies with the Debian Policy. And if it’s not compliant, you may need to use Quilt to patch it. You will need to fill debian/watch so you can track updates on the upstream with uscan. The work of a Debian packager never ends.