Comment 21 for bug 1745463

In this systemd github issue https://github.com/systemd/systemd/issues/5755 in particular is problematic darkstar states "the DNS servers are supposed to be exactly equivalent". But as far as I can tell systemd doesn't have any provision for temporarily falling back to a different nameserver if the main one is unavailable and reverting back when it becomes available again. Besides the scenario I listed in my previous comments, this also prevents using a local nameserver as the main nameserver but falling back to an external nameserver if the local one becomes unavailable, with recovery. In that case the two nameservers may not even return the same responses, but having a working nameserver that returns public records is better than no nameserver at all. Again, if there is a way to accomplish failovers with recovery with resolved, I'd love to know how to do it.

Maybe systemd-resolved will get functionality that supports these use cases, but right now ifaict it doesn't. And even when it does, will it get backported to LTS versions of ubuntu such as 18.04?