Expanding VM Disk Size on LXD
In this blog post, we’ll be discussing a simple and straightforward way to expand the disk size of a Virtual Machine (VM) on LXD using a cloud-init image. The image will auto-expand once we pass the appropriate configuration.
Initial VM Disk Status
Initially, the VM disk size looks like this:
ubuntu@umbrel:~$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 9.3G 9.3G 0G 100% /
As you can see, the /dev/sda2 filesystem is fully utilized.
Expanding VM Disk Size from the Host
To expand the disk size, we first shut down the VM then override the root device size from the host:
> $ lxc config device override myvm root size=20GiB
Device root overridden for myvm
Then, we start the VM:
> $ lxc start umbrel
Verifying the New VM Disk Size
Once the VM has started, we can verify the new size of the VM disk:
ubuntu@umbrel:~$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 20G 9.3G 10G 49% /
As you can see, the /dev/sda2 filesystem has now expanded to 20GB, with 10GB available.
In conclusion, expanding the disk size of a VM on LXD is a straightforward process when using a cloud-init image. By passing the appropriate configuration, the image will auto-expand, allowing you to easily manage your VM’s disk space.
Remember to always keep an eye on your disk usage to ensure optimal performance of your VMs.
Happy coding!