Force (command) to resize root partition

The command force root-partition-auto-resize resizes the root partition automatically to the maximum available space on the disk on system boot.

Total 9.1GB is allocated to the root partition in VyOS VM:

vyos@vyos:~$ df -kh
Filesystem Size Used Avail Use% Mounted on
udev 982M 0 982M 0% /dev
tmpfs 200M 6.1M 194M 4% /run
/dev/sda1 9.1G 364M 8.3G 5% /usr/lib/live/mount/persistence
/dev/loop0 306M 306M 0 100% /usr/lib/live/mount/rootfs/1.3.5.squashfs
tmpfs 998M 0 998M 0% /usr/lib/live/mount/overlay
overlay         9.1G  364M  8.3G   5% /
tmpfs           998M   84K  998M   1% /dev/shm

Now execute the below command followed by reboot to allocate the available free disk space to root partition:

vyos@vyos:~$ force root-partition-auto-resize
vyos@vyos:~$ reboot now

Post reboot, the total available space is 20 GB.

vyos@vyos:~$ df -kh
Filesystem      Size  Used Avail Use% Mounted on
udev            982M     0  982M   0% /dev
tmpfs           200M  3.5M  197M   2% /run
/dev/sda1        20G  365M   19G   2% /usr/lib/live/mount/persistence
/dev/loop0      306M  306M     0 100% /usr/lib/live/mount/rootfs/1.3.5.squashfs
tmpfs           998M     0  998M   0% /usr/lib/live/mount/overlay
overlay          20G  365M   19G   2% /
tmpfs           998M   84K  998M   1% /dev/shm