vrouter-agent crashes and can't start again

[Soren Hansen]

I was trying to get LBaaS working so I added this to my vrouter-agent config:

[SERVICE-INSTANCE]
netns_command=/usr/bin/opencontrail-vrouter-netns

At this point, I'd often find the vrouter-agent having crashed and unable to return to life, because a python process ("/usr/bin/python /usr/bin/opencontrail-vrouter-netns create loadbalancer [...]") was already listening on port 9090, causing vrouter-agent to refuse to start. I waited 10-15 minutes for the python process to die, but it never did. strace just showed waiting in a recvfrom syscall.

I'm not sure why that process would be listening on port 9090, but "netstat -lp" was pretty clear.

If neither vrouter-agent nor opencontrail-vrouter-netns were running and I tried running the "/usr/bin/opencontrail-vrouter-netns create loadbalancer [...]" command line, it would complain that it couldn't connect to localhost:9090.

I'm sorry about the lack of details, but I figured it'd be better to report it with few details than not report it at all.

I removed the SERVICE-INSTANCE section from my vrouter config and now everything works again (albeit without lbaas). I'm setting up a separate environment where I can recreate this and provide more information if needed.