How to automatically resize virtual box disk with vagrant

Background

I’m using vagrant on Windows with virtual box and CentOS 7 image. The vagrant box image I didn’t build it myself but get from people’s image here. The size of OS disk depends on its image. It’s configured at the the time when the image is created. I want in increase root partition from 10GB to 20GB. This guide won’t fit you if you build image yourself.

[root@node06 ~]# lsblk
NAME                         MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda                            8:0    0  9.8G  0 disk
├─sda1                         8:1    0  500M  0 part /boot
└─sda2                         8:2    0  9.3G  0 part
  ├─centos-root              253:0    0  8.3G  0 lvm  /
  └─centos-swap              253:1    0 1000M  0 lvm  [SWAP]

Test it

Let’s do it manually first. Test with hand then automate later. First we need to install the vagrant plugin that manage disk resizing by running> vagrant plugin install vagrant-disksize . Then set the disk size you wan in Vagrant file. For example

Vagrant.configure(2) do |config|
   config.vm.box = "centos/7"
   config.disksize.size = '20GB'
end

Run vagrant up . You’ll see the output as below. That means physical disk has been resized to 20GB.

Later, you need to resize partition table and file system which the command might be different depends on your environment (OS, file system ,etc…).

The image I use, mount root partition as LVM with xfs type. Below steps are how I extend root partition with parted command. Later I’ll use these steps in vagrant file to auto extend root mount point when run vagrant up.

1. Check the physical disk size. Now it’s 20GB.

[root@node06 ~]# lsblk
NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda               8:0    0   20G  0 disk
├─sda1            8:1    0  500M  0 part /boot
└─sda2            8:2    0  9.3G  0 part
  ├─centos-root 253:0    0  8.3G  0 lvm  /
  └─centos-swap 253:1    0 1000M  0 lvm  [SWAP]

2. Change partition table using parted. Require version 3.1.29 above for a resize option.

### Check free size
$  sudo parted /dev/sda print free
Model: ATA VBOX HARDDISK (scsi)
Disk /dev/sda: 21.5GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number  Start   End     Size    Type     File system  Flags
        32.3kB  1049kB  1016kB           Free Space
 1      1049kB  525MB   524MB   primary  xfs          boot
 2      525MB   10.5GB  9960MB  primary               lvm
        10.5GB  21.5GB  11.0GB           Free Space
### Resize to 100%
$ sudo parted /dev/sda resizepart 2 100%
### Check again
$ sudo parted /dev/sda print free
Model: ATA VBOX HARDDISK (scsi)
Disk /dev/sda: 21.5GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number  Start   End     Size    Type     File system  Flags
        32.3kB  1049kB  1016kB           Free Space
 1      1049kB  525MB   524MB   primary  xfs          boot
 2      525MB   21.5GB  20.9GB  primary               lvm

3. Extend physical volume. You’ll see volume group has free PE.

$ sudo pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               centos
  PV Size               9.28 GiB / not usable 3.00 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              2374
  Free PE               10
  Allocated PE          2364
$ sudo pvresize /dev/sda2
Physical volume "/dev/sda2" changed
1 physical volume(s) resized / 0 physical volume(s) not resized

$ sudo pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               centos
  PV Size               19.51 GiB / not usable 2.00 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              4994
  Free PE               2630
  Allocated PE          2364
$ sudo vgdisplay
  --- Volume group ---
  VG Name               centos
...
...
  VG Size               19.51 GiB
  PE Size               4.00 MiB
  Total PE              4994
  Alloc PE / Size       2364 / 9.23 GiB
  Free  PE / Size       2630 / 10.27 GiB

4. Extend logical group.

$ sudo lvdisplay
  --- Logical volume ---
  LV Path                /dev/centos/root
  LV Name                root
  VG Name                centos
...
  LV Size                8.26 GiB
  Current LE             2114
...
$ sudo lvextend -l +100%FREE /dev/centos/root
  Size of logical volume centos/root changed from 8.26 GiB (2114 extents) to 18.53 GiB (4744 extents).
  Logical volume root successfully resized.

5. Resize root file system online. Now root mount point have the new size.

$ sudo xfs_growfs /dev/centos/root
$ lsblk
NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda               8:0    0   20G  0 disk
├─sda1            8:1    0  500M  0 part /boot
└─sda2            8:2    0 19.5G  0 part
  ├─centos-root 253:0    0 18.5G  0 lvm  /
  └─centos-swap 253:1    0 1000M  0 lvm  [SWAP]

Automate Part

Put all previous steps to Vagrant file. For me, I use the script inline method. Run vagrant up, have a cup of coffee then check the result. :)

Vagrant.configure(2) do |config|
  common = <<-SCRIPT
  sudo parted /dev/sda resizepart 2 100%
  sudo pvresize /dev/sda2
  sudo lvextend -l +100%FREE /dev/centos/root
  sudo xfs_growfs /dev/centos/root
  SCRIPT
  config.vm.define "node01" do |node1|
    node1.vm.hostname = "node01"
    node1.vm.network "private_network", ip: "192.168.56.121"
    config.vm.provision :shell, :inline => common
  end
end