Increasing free disk space in Ubuntu VM

Increase disk size under Storage section in XenCenter.

Boot up the VM & log into it.

Verify Disk Space:

df -h

Check the partition layout

sudo fdisk -l /dev/xvda

To create new partitions, all old partiotions have to be deleted. To be able to delete the swap partitions the swap has to be turned off.

Verify Swap usage:

free -m

Turn off Swap disk

sudo swapoff -a

Now delete all partitions

sudo fdisk /dev/xvda

Command (m for help): d
Partition number (1-5): 1

Command (m for help): d
Partition number (1-5): 2

Now Create new partition and the Swap partition:

Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-31457279, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-31457279, default 31457279): 30410751

Command (m for help): n
Partition type:
p primary (1 primary, 0 extended, 3 free)
e extended
Select (default p): p
Partition number (1-4, default 2):
Using default value 2
First sector (30410752-31457279, default 30410752):
Using default value 30410752
Last sector, +sectors or +size{K,M,G} (30410752-31457279, default 31457279):
Using default value 31457279

The primary partition is now correct but the swap partition is not.
The type of the partition should not be “83” but “82” (marking it as a partition for the Linux swap)

Command (m for help): p

Device Boot          Start         End      Blocks   Id  System
/dev/xvda1            2048    30410751    15204352   83  Linux
/dev/xvda2        30410752    31457279      523264   83  Linux
 
Command (m for help): t
Partition number (1-4): 2
Hex code (type L to list codes): 82
Changed system type of partition 2 to 82 (Linux swap / Solaris)
 
Command (m for help): w
The partition table has been altered!

Now reboot the VM:

shutdown -r now

The swap partition will be mounted using an UUID identifier. After creating a new partition for swap the UUID will not match and upon reboot, no swap will be available.

Note the UUID of Swap Partition

awk '/swap/ { print $1 }' /etc/fstab
UUID=8bb62351-4436-47df-92fe-af2865f03461

Turn off the Swap

sudo swapoff -a

Confirm if the SWAp disk size is zero now:

free -m

To make sure that there is no data (usable by the kernel) at the beginning of the partition use DD (Carefully)

root@ubuntu:~# dd if=/dev/zero of=/dev/xvda2
dd: writing to `/dev/xvda2': No space left on device

Now change the UUID of the Swap disk to match the fstab:

mkswap -U 8bb62351-4436-47df-92fe-af2865f03461 /dev/xvda2

Turn on the Swap again

swapon -a

Confirm if swap size is non zero now

free -m

Now resize the filesystem

resize2fs /dev/xvda1

Now confirm if the changes have taken effect:

df -h

References

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