Notice when an IP is set or changes

1

Hello everyone,

Initial situation, I have privileged containers that get an IPv4 and Ipv6 from my router at startup.

Now I am looking for an elegant way to execute a script every time the IP v4 or v6 changes.

Attempts with dhclient hooks have failed so far.

Has anyone ever had a similar requirement and an elegant solution for it?

I am looking forward to your feedback.

2

Hmm, dhclient hooks would definitely have been my go to solution there, assuming your container is in fact using dhclient (for networkd you’d need to use networkd-dispatcher).

You may be able to do something custom listening for netlink events, but running a daemon just for this seems a bit much.