Is there a way to automatically shutdown a network-providing VM when its client VMs shut down?

General Discussion
1

Consider the following topology:

sys-net -> sys-firewall -> VPN-vm --> application-vm-1
                                  |-> application-vm-2
                                  L-> VPN-dispVM

If every application-vm and VPN-dispVM has shut down, there is no need to keep VPN-vm running. It is just wasting memory.

Is there a way to trigger an automatic shutdown of VPN-vm once there are no application-vms or VPN-dispVMs running, the way VPN-vm starts automatically as soon as any application-vm does?

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2

Not that I know of…

However, it’s trivial to set up a cron job running every 2 minutes (or 3… or 5… or even, 1 minute) to check if any qube is using your VPN-vm as its NETVM :slightly_smiling_face:

Along the lines of:
qvm-ls --running --fields netvm --raw-data | grep -q "VPN-vm" || qvm-shutdown --force --quiet "VPN-vm"

This will shut down VPN-vm if no qube uses it.
Note that I would personally run this every 5 minutes to avoid unnecessary shutdowns and re-starts of the VPN-vm when it’s unused for short periods of time.
Note2: it can be done in a more complicated way, with xl hooks, to touch a file which records the exact time when the last qube is shut down… but not worth the effort, imho.

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