Supervisor HTTP Server Port Issue

Question

I have supervisor setup to manage a few processes. It works perfectly fine when I boot my server, however when I stop it and try to start it again it fails and give's me this error msg:

 * Starting Supervisor daemon manager...
Error: Another program is already listening on a port that one of our HTTP servers is configured to use.  Shut this program down first before starting supervisord.
For help, use /usr/bin/supervisord -h
   ...fail!

I'm running nginx on port 80 and 4 web servers on ports 8000, 8001, 8002, 8003

Does anyone have any idea of what is going on?

When I reboot everything works fine.

Answer 1

Just ran into this as well. I fixed it by doing:

sudo unlink /tmp/supervisor.sock

This .sock file is defined in /etc/supervisord.conf's [unix_http_server]'s file config value (default is /tmp/supervisor.sock).

Hope this helps someone in the future.

Answer 2

I'd use lsof to find out what process is listening on those ports.

lsof -i tcp | grep LISTEN

Once you've worked out what process it is, that's half the battle.