Comment 17 for bug 1749425

You described a lot of issues in comment #14:

* Missing interfaces inside qrouter namespaces (OVS taps)
* Missing iptables rules
* Missing floating IP aliases on OVS interfaces inside the qrouter namespaces

Some of those might be fixed in master, especially the iptables one, and should have been cherry-picked to the stable branches but probably only to Ocata. The "add floating ip" path should re-queue the message and retry in a second or two, if it doesn't then please see if there is a trackback and put the info here or another bug.

There could also be something happening with keepalived where it's not getting things done, since it is managing the VIPs when HA is enabled.

Finally, regarding the traceback, I've never seen that before. My first thought is to sprinkle "if instance" in all those code paths, but maybe there's something else going on here that we should figure out. For example, if the initial creation of the instance failed, then a message came to add a floating IP, returning without doing anything (not instance case) isn't what we want to do. This would require some log examination to figure out what exactly happened.