Category: Linux

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Linux

Increasing the disk size of a Linux VM

In this guide we examine how to increase the disk size of a linux VM, when the need arises.

Note
Make sure you backup everything you have on your system, before trying this guide. This is an advanced HOWTO and it can break your system, irrecoverably, if you make a critical mistake!

This guide assumes that you are using the Linux Logical Volume Manager (LVM) to manage your storage. If you are new to the concept of LVM you can study the excellent LVM HOWTO from The Linux Documentation Project website.

Even though it may be possible to resize a Linux system without using LVM, an LVM setup is highly recommended. No matter if you are working on a physical or virtual machine, LVM is the preferred method of storage management in Linux, since it simplifies tasks related to storage, including volume resizing.

Another assumption is that the disk is using the legacy MBR partition table format. But the guide can easily be adapted to disks using a GPT format.

Increasing the size of the virtual disk

In this guide we are using VMware but this section can be easily adapted to different virtualization systems.

  1. Before increasing the disk size, it is a good idea to consolidate the snapshots of your VM. Right click and go to: <br />Snapshots -> Consolidate:

    Consolidate Snapshots

  • Press ‘OK’ when asked to do so. When the confirmation dialog appears, press ‘Yes’:

    Confirm Consolidate
    When the operation is completed (Check the ‘Recent Tasks’ pane) move to the next step.

  1. Right click on the VM again and go to Edit Settings. From here, choose the disk you wish to enlarge:

    Enlarge Disk
    Change the size to your desired size and press OK. In my case I will change a 10G size hard disk to 65G. Press ‘OK’ when done.

Now we should move to our linux system.

Force Linux to detect the changes in the disk size

  1. Check the detected disk size: 
    # cat /proc/partitions
major minor  #blocks  name

  8        0   10485760 sda
  8        1     248832 sda1
  8        2          1 sda2
  8        5   10233856 sda5
 11        0    1048575 sr0
254        0    9760768 dm-0
254        1     471040 dm-1

    As you can see the primary disk (sda) has a size of 10485760KB, which translates to 10GB:

    # echo '10485760/1024/1024' | bc -l
10.00000000000000000000
  2. Find the SCSI subsystem buses: 
    # ls /sys/class/scsi_device/
0:0:0:0  2:0:0:0

    0:0:0:0 is the primary bus.

  • Rescan for disk changes:

    # echo 1 > /sys/class/scsi_device/0\:0\:0\:0/device/rescan

  • Check the new size: 
    # cat /proc/partitions
major minor  #blocks  name

  8        0   68157440 sda
  8        1     248832 sda1
  8        2          1 sda2
  8        5   10233856 sda5
 11        0    1048575 sr0
254        0    9760768 dm-0
254        1     471040 dm-1

    The size is now 65G:

    # echo '68157440/1024/1024' | bc -l
65.00000000000000000000

    • Resize the partition used by the LVM Physical Volume (PV)

    1. Check which partition is used by the PV: 
      # pvs
 PV         VG         Fmt  Attr PSize PFree
 /dev/sda5  myvgroup   lvm2 a--  9,76g    0

      So only the /dev/sda5 partition is used by LVM.

    2. Backup the partition table:

      # sfdisk -d /dev/sda > sda-part.mbr

      Now you need to save that file elsewhere because when if partition table goes down the drain, you will have no way to access the partition table backup file. You could use scp to transfer the file on another system:

      # scp sda-part.mbr user@another-server:

      If you need to restore the partition table you can use a recovery/live cd or usb like this:

      # scp user@another-server:sda-part.mbr
# sfdisk /dev/sda < sda-part.mbr

      Note
      You can use sgdisk for disks with GPT tables.
      Backup:       sgfdisk -b sda-part.gpt /dev/sda.
      Restore: sgfdisk -l sda-part.gpt /dev/sda

    3. Resize the partition used by the PV.

    • Check the size of the partition:

      # sfdisk -d /dev/sda
Warning: extended partition does not start at a cylinder boundary.
DOS and Linux will interpret the contents differently.
# partition table of /dev/sda
unit: sectors

/dev/sda1 : start=     2048, size=   497664, Id=83, bootable
/dev/sda2 : start=   501758, size= 20467714, Id= 5
/dev/sda3 : start=        0, size=        0, Id= 0
/dev/sda4 : start=        0, size=        0, Id= 0
/dev/sda5 : start=   501760, size= 20467712, Id=8e

    • Mark down the details of the sda2 and sda5 partitions in the following table:
      Partition Start Sector size in KB size in Sectors
      sda2 501758 10233857 20467714
      sda5 501760 10233856 20467712

      Note
      Each Sector is 512 bytes. So the number of Sectors is double the number of KBytes (1024 Bytes). The logical sda5 partition is 1KB (or 2 Sectors) smaller than the extended sda2 partition.*

    • Calculate the sizes of the new partitions:

      The total size of the sda disk is 68157440KB which translates to 136314880 Sectors. So the new size (in Sectors) of sda2 would be:

      # echo 136314880-501758 | bc -l
135813122

      The size, in sectors, of sda5 would be:

      # echo 136314880-501760 | bc -l
135813120

      According to the calculations above, the new table with the partition details would be:

      Partition Start Sector size in KB size in Sectors
      sda2 501758 67906561 135813122
      sda5 501760 67906560 135813120
    • Resize the sda2 (extended) and sda5 partitions.

      Copy the sda-part.mbr file to sda-part-new.mbr and make the following changes to sda-part-new.mbr:

      # partition table of /dev/sda
unit: sectors
/dev/sda1 : start=     2048, size=    497664, Id=83, bootable
/dev/sda2 : start=   501758, size= 135813122, Id= 5
/dev/sda3 : start=        0, size=         0, Id= 0
/dev/sda4 : start=        0, size=         0, Id= 0
/dev/sda5 : start=   501760, size= 135813120, Id=8e

      Now apply these changes to the MBR using sfdisk:

      # sfdisk --no-reread /dev/sda < sda-part-new.mbr

      Ignore any warnings for now.

    • Verify the new partition table:

      # sfdisk -d /dev/sda
Warning: extended partition does not start at a cylinder boundary.
DOS and Linux will interpret the contents differently.
# partition table of /dev/sda
unit: sectors

/dev/sda1 : start=     2048, size=   497664, Id=83, bootable
/dev/sda2 : start=   501758, size=135813122, Id= 5
/dev/sda3 : start=        0, size=        0, Id= 0
/dev/sda4 : start=        0, size=        0, Id= 0
/dev/sda5 : start=   501760, size=135813120, Id=8e

      It looks correct.

    • Verify that the linux kernel has been notified of the changes:

      # cat /proc/partitions 
major minor  #blocks  name

   8        0   68157440 sda
   8        1     248832 sda1
   8        2          1 sda2
   8        5   10233856 sda5
  11        0    1048575 sr0
 254        0    9760768 dm-0
 254        1     471040 dm-1

      It looks like the system still sees the old partition size. You could use a utility like partprobre, kpartx or even sfdisk to force the kernel to re-read the new partition table:

      # sfdisk -R /dev/sda
BLKRRPART: Device or resource busy
This disk is currently in use.

      Alas if the partition is in use, the kernel will refuse to re-read the partition size. In that case just schedule a reboot and try again.

      After the system reboot:

      # cat /proc/partitions
major minor  #blocks  name

   8        0   68157440 sda
   8        1     248832 sda1
   8        2          1 sda2
   8        5   67906560 sda5
  11        0    1048575 sr0
 254        0    9760768 dm-0
 254        1     471040 dm-1

      So the new size of the sda5 partition is 64,76GB:

      # echo '67906560/1024/1024' | bc -l
64.76074218750000000000

      If the partition size has increased, we can move on to the next step.

    Resize the Physical Volume (PV).

    1. Check the size of the Physical Volume:

      # pvs
 PV         VG        Fmt  Attr PSize PFree
 /dev/sda5  ubuntu-vg lvm2 a--  9,76g    0

      So the size of the PV is still 9,76GB.

    2. Resize the PV:

      # pvresize /dev/sda5
 Physical volume "/dev/sda5" changed
 1 physical volume(s) resized / 0 physical volume(s) not resized

    3. Verify that the size is resized: 
      # pvs
 PV         VG        Fmt  Attr PSize  PFree 
 /dev/sda5  ubuntu-vg lvm2 a--  64,76g 55,00g

      So the new size of the PV is 64,8GB.

    Resize the logical volume.

    1. Check the current size of the logical volume (used for the root filesystem):

      # lvs
 LV     VG        Attr     LSize   Pool Origin Data%  Move Log Copy%  Convert
 root   ubuntu-vg -wi-ao--   9,31g
 swap_1 ubuntu-vg -wi-ao-- 460,00m

      The root volume is still at 9,3GB.

    2. Check the free space:

      # vgs
 VG        #PV #LV #SN Attr   VSize  VFree 
 ubuntu-vg   1   2   0 wz--n- 64,76g 55,00g

    3. Resize the root logical volume: 
      # lvresize -L +55,00g /dev/mapper/ubuntu-vg-root
 Extending logical volume root to 64,31 GiB
 Logical volume root successfully resized
    4. Verify LV resize: 
      # lvs
LV     VG        Attr     LSize   Pool Origin Data%  Move Log Copy%  Convert
root   ubuntu-vg -wi-ao--  64,31g
swap_1 ubuntu-vg -wi-ao-- 460,00m

      The root logical volume size is now at 65,3GB

    Resize the root filesystem.

    1. Check the current size of the root filesystem:

      # df -hT
Filesystem                  Type      Size  Used Avail Use% Mounted on
rootfs                      rootfs    9,2G  2,2G  6,6G  25% /
udev                        devtmpfs   10M     0   10M   0% /dev
tmpfs                       tmpfs     101M  204K  101M   1% /run
/dev/mapper/ubuntu-vg-root  ext4      9,2G  2,2G  6,6G  25% /
tmpfs                       tmpfs     5,0M     0  5,0M   0% /run/lock
tmpfs                       tmpfs     201M     0  201M   0% /run/shm
/dev/sda1                   ext2      228M   18M  199M   9% /boot

      So the root filesystem is still at 9,2GB.

    2. Resize the file system:

      # resize2fs /dev/mapper/ubuntu-vg-root
resize2fs 1.42.5 (29-Jul-2012)
Filesystem at /dev/mapper/ubuntu-vg-root is mounted on /; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 5
Performing an on-line resize of /dev/mapper/ubuntu-vg-root to 16858112 (4k) blocks.
The filesystem on /dev/mapper/ubuntu-vg-root is now 16858112 blocks long.

    3. Verify that the filesystem has been resized: 
      # df -hT
Filesystem                  Type      Size  Used Avail Use% Mounted on
rootfs                      rootfs     64G  2,2G   58G   4% /
udev                        devtmpfs   10M     0   10M   0% /dev
tmpfs                       tmpfs     101M  204K  101M   1% /run
/dev/mapper/ubuntu-vg-root  ext4       64G  2,2G   58G   4% /
tmpfs                       tmpfs     5,0M     0  5,0M   0% /run/lock
tmpfs                       tmpfs     201M     0  201M   0% /run/shm
/dev/sda1                   ext2      228M   18M  199M   9% /boot

    So now you have 55GB of additional storage on your root partition, to satisfy your increasing storage needs.

    References

    • https://ma.ttias.be/increase-a-vmware-disk-size-vmdk-formatted-as-linux-lvm-without-rebooting/
    • http://gumptravels.blogspot.com/2009/05/using-sfdisk-to-backup-and-restore.html
    • http://askubuntu.com/questions/57908/how-can-i-quickly-copy-a-gpt-partition-scheme-from-one-hard-drive-to-another
    Categories
    Linux

    Defending against Internet attacks for your Ubuntu Server (14.04 LTS)

    The Ubuntu Server Edition LTS is a highly reliable server system and comes with reasonable security defaults. Still there are additional steps to take if we want to enhance its security.

    Note
    These steps will only help make your server more secure but they will not make it bulletproof! Security is an evergoing process and you should always be alert for new security issues.

    Prerequisites

    1. Install a fresh Ubuntu Server 14.04 (Preferable 64 bit).

    2. Use the following command to install SSH, if not already installed:

      $ sudo apt-get -y install openssh-server

    3. Make sure you have a sudo enabled user: 
      $ id | grep sudo
uid=1000(theoadm) gid=1000(theoadm) groups=1000(theoadm),4(adm),24(cdrom),27(<strong>sudo</strong>),30(dip),46(plugdev),116(lpadmin),117(sambashare),1006(gitusers)

      If the above is not true, you will have to login as root with su – and execute all the commands as the root user.

    Secure SSH

    1. Block remote logins as root. Set the value of the PermitRootLogin keyword, in /etc/ssh/sshd_config, to without-password or no. This will disable password based authentication for the user root and only allow Public Key Authentication.

    • First check what is the value of the PermitRootLogin keyword:

      $  grep PermitRootLogin /etc/ssh/sshd_config
PermitRootLogin without-password

    • If the value is yes, it is considered a very bad practice, especially on a public server. Use your favorite editor or the following command to change it: 
      $ sudo sed -i 's/^\(PermitRootLogin\s\)[yY][eE][sS]/\1without-password/' /etc/ssh/sshd_config
    • Don’t forget to restart SSH: 
      $ sudo service ssh restart
    1. Change the SSH listening port from 22 to something else. This is not the ultimate security measure but, since most ssh attack bots target the default port, it will largely minimize the attacks.
    • First select a port not used by a well known service. Let’s assume that we decided to use port 4547: 
      $  grep 4547 /etc/services ; echo $?
  1

      A return value of 1 indicates that no well known service is using that port.

    • Then change the value of the Port keyword to 4547. Use your favorite editor or the following sed command to do so:

        $  sudo sed -i 's/^\(Port\s\)22/\14547/' /etc/ssh/sshd_config

    • Restart your SSH server: 
      $ sudo service ssh restart
    • Verify that the port has been changed: 
      $ sudo netstat -lnpt | grep ssh
  tcp     0    0 0.0.0.0:4547   0.0.0.0:*   LISTEN   11979/sshd
  tcp6    0    0 :::<strong>4547</strong>        :::*        LISTEN   11979/sshd

    Enable Filtering

    1. Enable the firewall functionality. We will be using the pre-installed Uncomplicated Firewall (ufw) which is just a front-end to the, more complicated, iptables.
    • First allow port 4547. Make sure you type the correct port or you will be locked out of your server! Use the following command to allow traffic to our chosen port: 
      $ sudo ufw allow 4547/tcp
    • Then enable the firewall: 
      $ sudo ufw enable
    • Verify that is working: 
      $ sudo ufw status
Status: active

To                         Action      From
--                         ------      ----
4547/tcp                   ALLOW       Anywhere
4547/tcp (v6)              ALLOW       Anywhere (v6)
    1. Setup the Fail2ban intrusion prevention software. [Fail2ban](http://www.fail2ban.org/wiki/index.php/Main_Page "Fail2ban") is an excellent tool to block attacks against SSH and many other services.
    • Install fail2ban: 
      $ sudo apt-get -y install fail2ban
    • SSH protection is enabled by default but we need to reconfigure the ssh port to 4547. In the file /etc/fail2ban/jail.conf change the port = ssh value to 4547: 
      [ssh]

enabled  = true
port     = <strong>4547</strong>
filter   = sshd
logpath  = /var/log/auth.log
maxretry = 6
    • Enable protections against distributed attacks. Edit the [ssh-ddos] section in /etc/fail2ban/jail.conf: 
      [ssh-ddos]

enabled  = yes
port     = 4547
filter   = sshd-ddos
logpath  = /var/log/auth.log
maxretry = 6

    Unattended upgrades

    Enabling unattended upgrades may not be a very good idea on mission critical servers. On such scenarios you may want to test the upgrades on a test server before you apply them on the production. Nevertheless it may be a good practice to enable this functionality on machines that are expected to run unattended for long periods of time. This will help to automatically patch vulnerabilities of your machine. Note, however, that patches do not automatically apply on the Linux kernel or the glibc library, because a restart is needed in these cases. So even on mostly unattended scenarios, you still need to check occasionally whether your machine needs a restart.

    1. Make sure that the unattended-upgrades package is installed. It is usually pre-installed but if not, you can use the following command to install it: 
      $ sudo apt-get -y install unattended-upgrades
    2. Then we must configure automatic upgrades. Answer Yes when asked in the following command: 
      $ sudo dpkg-reconfigure updates unattended-upgrades

      Alternatively you can edit the /etc/apt/apt.conf.d/20auto-upgrades configuration file as follows:

      APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Unattended-Upgrade "1";

    Further Reading

    As we said earlier, security is an ongoing process. Some further info to make your site more secure:

    • Hardening Ubuntu:
      http://hardenubuntu.com/
    • Applied Crypto Hardening: Don’t forget to read the OpenSSH section of the [Better Crypto](https://bettercrypto.org/ "bettercrypto.org") draft paper: https://bettercrypto.org/static/applied-crypto-hardening.pdf
    • Block port scanning: The article below explains how to use Fail2ban to block port scanning.
      http://www.irrexpr.com/2013/06/using-iptables-logging-and-fail2ban-to.html
    • [4] Port knocking: Port knocking is another interesting technique where you can open your SSH ports, or ports for other services, on demand. Strictly for paranoids!
    Categories
    Linux

    How to set up your own LAMP server on Ubuntu 14.04 (aka Trusty Tahr)

    You sail with no lights in the midnight dark.

    Afraid of betrayal by lights from the land,

    alone and thoughtful, you walk the deck,

    clutching Aladdin’s lamp in your hand.

    ~ Nikos Kavvadias ~

    In this guide we are setting up an Ubuntu/Linux based webserver with a database backend and using the PHP scripting language. The term LAMP is not related to lighting, nor Middle Eastern tales but refers to the combination of Linux, Apache, MySQL MariaDB and PHP.

    Traditionally we have been using MySQL for this task but since Ubuntu 14.04, MariaDB is available from the stock Ubuntu repos. It is recommended to  use MariaDB over the beloved MySQL, because the future of the latter is not so promising after the purchase from Oracle.

    We will also be using VirtualBox to install Ubuntu Server on a virtual machine but you can follow this guide on an actual computer or on your cloud/hosting provider.

    To complete this guide you will need to download a copy of the latest Ubuntu Server ISO image (current version 14.04.2)

    Setting up the Virtual Machine

    1. Install VirtualBox:
      Make sure you have VirtualBox installed. If not, you can download it from your package manager or from command line (works for Ubuntu and Debian based systems):

      $ sudo apt-get -y install virtualbox

      If you are using a Windows PC you will need to go to the
      VirtualBox website and download it.

    2. Start VirtualBox:VBox-1
      Click on the New icon to create a new virtual machine.
    3. Setup the VM name:
      VBox-2
      Type Ubuntu-server in the Name and click ‘Next’.
    4. Setup the memory size.
      VBox-3
      The default 512 MB is enough but you may use 1024 if you have memory to spare.
    5. Setup the Virtual Hard Drive:
      • Create the Virtual Hard Drive:
        VBox-4
      • Select the format of the Hard Drive:
        VBox-5
        VDI is the default for VirtualBox.
      • Select the type of the Hard Drive:
        VBox-6
        Fixed size is supposedly better for performance but it will occupy space equal to its size on your disk. For testing purposes choose Dynamically allocated.
      • Select the size of your disk:
        VBox-7
        If you have chosen Dynamically allocated before, then your Hard Drive can be as large as 2,00 TB without actually occupying that much space on the physical  disk. 40,00 GB is more than enough.
    6. Setup Networking:
      The default network mode for newly created VirtualBox machines is NAT.  This mode is not very convinient if you want to access your VM from the physical host so we are changing that to Bridged Adapter.
      Warning: in some enterprise environments this could trigger the security defences of your network and lock you out! Please consult with you network administrator before enabling this at work!

      You can find more information about the VirtualBox networking modes here:
      VirtualBox Networking Modes

      • To setup Bridged Networking press the Settings icon:VBox-Net-1
      • The default mode in the Attached to: field is NAT:
        VBox-Net-2
      • Change NAT to Bridged Adapter:
        VBox-Net-3
        If you have more than one ethernet interfaces you will need to choose the correct one in the Name field. Usually the correct value is eth0 but this is not always the case. Press OK and you are done with networking.
    7. Start your VM:
      • Press the Start icon:
        VBox-8
      • Boot the Ubuntu ISO:
        VBox-9
        Click on the little folder icon on the right side.
      • Select the Ubuntu ISO file you downloaded earlier:
        VBox-10
      • Press Start to begin the installation:
        VBox-11

    The above procedure is for those that do not have a spare computer for testing. Building a VM is the safest way to experiment with all kind of setups without breaking your working computer.

    Now if you do have a spare computer you can skip the steps above and go straight to the steps below. On a physical computer you will need to burn the ISO file on a CD/DVD or write it on a USB stick, using the usb-creator on Ubuntu or UNetbootin  for other systems. You will need to setup your BIOS/UEFI to boot from the CD or USB first. On Windows 8 systems you may need to disable the abomination called Secure Boot.

    Setting up Ubuntu Server 14.04 (Trusty Tahr)

    Now prepare your pain-killers as this will take some time.

    1. Select the Language for the setup process:
      Ubuntu-Server-1
      This is the language during the installation. Choose English or whatever language you feel comfortable with. If you haven’t figured it out already, the mouse will not work here. Use the arrow keys to select the language and press ‘Enter’ to go to the next step. In case Virtualbox captures your mouse you can press the right Ctrl button to release it.
    2. Start the installation:
      Ubuntu-Server-2
      Select Install Ubuntu Server and press ‘Enter’.
    3. Select the system Language:
      Ubuntu-Server-3 Again select whatever language you need. This is the language for the system, after the installation is finished.
    4. Select your location:
      Ubuntu-Server-4
      If your location is not listed here choose Other and press ‘Enter’.
    5. Select your location now:
      Ubuntu-Server-5
    6. Select your country:
      Ubuntu-Server-6
    7. Select your Locale:
      Ubuntu-Server-7
      If you selected English before you will get a list of English speaking countries to choose from.
    8. Detect keyboard layout:
      Ubuntu-Server-8
      Select Yes if you are unsure of your keyboard layout. No is usually safe unless you have a weird keyboard.
    9. Choose the basic keyboard layout:
      Ubuntu-Server-9
    10. Select specific keyboard layout:
      Ubuntu-Server-10
      Select the first if you are unsure.

      • Wait for the setup to load all necessary components for the installation. If you are not connected to a DHCP enabled network, you will be prompted to give your network settings. Ask your network administrator for assistance.
    11. Select the hostname of your server:
      Ubuntu-Server-11
      Press ‘Tab’, select Continue and then ‘Enter’.
    12. Enter your name:
      Ubuntu-Server-12
      Nobody forces you to enter your actual name :).
    13. Enter your username:
      Ubuntu-Server-13
    14. Select your password:
      Ubuntu-Server-14
      This is a privileged account (using the sudo command) so you better choose a hard to guess password.
    15. Verify your password again:
      Ubuntu-Server-15
    16. Encrypt your home directory:
      Ubuntu-Server-16
      This will protect your personal files if you are paranoid. For testing it’s OK to choose No.
    17. Confirm your timezone:
      Ubuntu-Server-17
      If the time zone is correct select Yes otherwise No.
    18. Select the partitioning method:
      Ubuntu-Server-18The first option is simpler and probably OK for testing. But on a production server you may need to resize the partitions, create new ones and add more disks, so the LVM method is the recommended.
    19. Select the hard drive for the installation:
      Ubuntu-Server-19
    20. Confirm if you want to write to this hard drive:
      Ubuntu-Server-20
      Select Yes and press ‘Enter’. Make sure you don’t have any data you need on this drive!
    21. Select Disk Size for the system:
      Ubuntu-Server-21
      It’s OK to give all available disk size on a test machine.
    22. Write changes to disk:
      Ubuntu-Server-22
      Select Yes and press ‘Enter’.

      • Wait for the Base system installation to complete
    23. Setup your proxy server:
      Ubuntu-Server-23
      If you do not use a proxy server leave this field blank.
    24. Method to manage upgrades:
      Ubuntu-Server-24
      This is a tricky dilemma. If you choose No automatic updates you may forgot to apply updates and render your system vulnerable to attacks. If you choose Install security features automatically your system could break after an update. Choose wisely!
    25. Choose additional software to install:
      Ubuntu-Server-25
      It is a good idea to enable the OpenSSH server so you can access your machine remotely. There is also a LAMP option here but this will install the MySQL server  instead of MariaDB and you may wish to avoid that.

      • Wait for the additional software to be installed.
    26. Install the boot loader:
      Ubuntu-Server-26
      Select Yes here.
    27. Restart your machine:
      Ubuntu-Server-27
      Press Continue to restart the system.
    28. Welcome to your newly created Ubuntu server:
      Ubuntu-Server-28
      Congratulations if you have reached so far! You have just installed a fresh Ubuntu server ready to rock!

    Installing the LAMP stack

    Installing a LAMP environment is easy.  We will need to install the Apache webserver, the MariaDB relational database, PHP and the Apache PHP module.

    1.  Before we proceed with the LAMP stack installation it is a good idea to update/upgrade our system.The command below will download the lists containing the most fresh version of available packages. 
      $ sudo apt-get update

      The following command will download the packages to be upgraded, remove obsolete packages and download new ones:

      $ sudo apt-get -y dist-upgrade
    2. Installing necessary packages: 
      $ sudo apt-get -y install apache2 libapache2-mod-php5 mariadb-server php5-mysql
    3. Set the root password for MariaDB:
      MariaDB-1
    4. Verify root password:
      MariaDB-2
    5. Accept the warning:
      MariaDB-3

    After the packages installation is finished we should be ready to go!

    Testing your web server

    Before testing we need to determine the IP address of the server. Run this command on the terminal of your webserver:

    $ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default 
 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
 inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
 inet6 ::1/128 scope host 
 valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
 link/ether 08:00:27:5a:6e:a9 brd ff:ff:ff:ff:ff:ff
 inet 192.168.56.101/24 brd 192.168.56.255 scope global eth0
 valid_lft forever preferred_lft forever
 inet6 fe80::a00:27ff:fe5a:6ea9/64 scope link 
 valid_lft forever preferred_lft forever

    The IP of your server is 192.168.56.101

    1. Testing your ssh connection:
      First lets check if ssh works on your server. Type the following command from the terminal of your PC:

      me@PC:~$ ssh user@192.168.56.101
The authenticity of host '192.168.56.101 (192.168.56.101)' can't be established.
ECDSA key fingerprint is e4:e7:ac:6c:68:ea:71:90:29:03:bc:92:8e:23:f7:0e.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.56.101' (ECDSA) to the list of known hosts.
user@192.168.56.101's password: 
Welcome to Ubuntu 14.04.1 LTS (GNU/Linux 3.13.0-35-generic x86_64)

 * Documentation: https://help.ubuntu.com/

 System information as of Mon Sep 15 11:36:04 EEST 2014

 System load: 0.09 Processes: 84
 Usage of /: 4.5% of 38.02GB Users logged in: 0
 Memory usage: 13% IP address for eth0: 192.168.56.101
 Swap usage: 0%

 Graph this data and manage this system at:
 https://landscape.canonical.com/

Last login: Mon Sep 15 11:36:04 2014
user@webserver:~$

      The first time you connect to any ssh system you get the warning that The authenticity of host ‘<myhost(myip)>’ can’t be established. This happens only the first time and it is a safe-guard against MITM attacks. Type yes (not y!) here.

      Then it will ask for your password. You will see nothing as you type it! That’s normal.

      If you password is correct you will be greeted by the system information in the command prompt.

    2. Testing your Apache webserver:
      Fire up your browser and type this URL in the address bar:
      http://192.168.56.101
      Test-Apache
      If you can see the above page in your browser, it means that your Apache webserver is up and running.
    3. Testing PHP:
      You need to create the following file under the Apache
      DocumentRoot (/var/www/html):
      Type the following commands on your server terminal:

      $ sudo -i
[sudo] password for user:
# cat > /var/www/html/phpinfo.php << EOF
> <?php phpinfo(); ?>
> EOF
# exit
$

      The command sudo -i will give you access as the super-privileged root user. Notice how the prompt changes frpm $ to #.

      The command cat … will create a new file /var/www/html/phpinfo.php with the content <?php phpinfo(): ?>. This is a nice way to test your PHP setup and get some basic information about your LAMP setup.

      The command exit will take you back to your normal user account. It is not considered a good practice to be logged in as root for too long.

      Finally direct your browser to http://192.168.56.101/phpinfo.php and expect to see something like this:
      Test-php-1
      If you scroll further down you will see that mysql is enabled too:
      Test-php-2
      For security reasons it may be a good idea to delete the
      phpinfo.php file afterwards:

      $ sudo rm /var/www/html/phpinfo.php
    4. Install phpMyAdmin (optional): 
      $ sudo apt-get -y install phpmyadmin
    5. Let the package management system handle phpMyAdmin configuration:
      phpMyAdmin-1
    6. Type the MariaDB root password:
      phpMyAdmin-2
    7. Set the phpMyAdmin database password:
      phpMyAdmin-3
    8. Verify the password:
      phpMyAdmin-4
    9. Choose the correct webserver (apache2):
      phpMyAdmin-5
    10. Visit the phpMyAdmin URL:
      (http://192.168.56.101/phpmyadmin):
      phpMyAdmin-6
      Use the username root and the MariaDB root password to login.
    11. Now you can manage MariaDB through phpMyAdmin:
      phpMyAdmin-7

    This was the final test that ensures everything works as expected. Now you can start developing your PHP website or install a PHP application like WordPress or ownCloud.