Sending general signal to child process of supervisord

Question

I am using supervisord to manage a bunch of processes. Is it possible to use supervisorctl to send arbitrary signals to these processes without actually stopping them and setting stopsignal?

Answer 1

Until 3.2.0 (released November 2015), supervisorctl had no support for sending arbitrary signals to the processes it manages.

From 3.2.0 onwards, use supervisorctl signal:

signal <signal name> <name>     Signal a process
signal <signal name> <gname>:*      Signal all processes in a group
signal <signal name> <name> <name>  Signal multiple processes or groups
signal <signal name> all        Signal all processes

so

supervisorctl signal HUP all

would send SIGHUP to all processes managed by supervisor.

Until 3.2.0, you instead could use supervisorctl status to list the pids of the managed processes. Then use kill to send signals to those pids. With a little sed magic, you can even extract those pids to be acceptable as input to the kill command:

kill -HUP `bin/supervisorctl status | sed -n '/RUNNING/s/.*pid \([[:digit:]]\+\).*/\1/p'`

would also send SIGHUP to all active processes under supervisord control.

Answer 2

As of 3.2.0, you CAN now send arbitrary signals to processes!

$ supervisord --version
3.2.0


$ supervisorctl signal help
Error: signal requires a signal name and a process name
signal <signal name> <name>     Signal a process
signal <signal name> <gname>:*      Signal all processes in a group
signal <signal name> <name> <name>  Signal multiple processes or groups
signal <signal name> all        Signal all processes


$ supervisorctl signal HUP gateway
gateway: signalled