Build your own Proxmox LXC Template

Start off in the Proxmox web GUI by creating a normal LXC container using one of the existing templates. I chose Debian 12 here.

Start it up and install/customise anything you want. I installed docker on mine since i use this a lot and it saves a step.

Once finished, shutdown the LXC container.

Go to your Proxmox node's shell.

Enter the following command where 250 is your container's ID in Proxmox

pct set 250 --delete net0

vzdump 250 --mode stop --compress gzip --dumpdir /tmp/

cd /tmp

Rename the image here

mv vzdump*.tar.gz my-custom-debian-lxc.tar.gz

I have an NFS share that I store my ISOs and templates on so I'm going to move it there

mv my-custom-debian-lxc.tar.gz /mnt/pve/ISOs/template/cache/

If you go to the ISOs volume in the Proxmox GUI and choose CT Templates you should now see your new image

You can then create containers using this image