supervisord stopping child processes

Question

One of the problems, I face with supervisord is that when I have a command which in turn spawns another process, supervisord is not able to kill it.

For example I have a java process which when runs normally is like

 $ zkServer.sh start-foreground  $ ps -eaf | grep zk  user 30404 28280  0 09:21 pts/2    00:00:00 bash zkServer.sh start-foreground  user 30413 30404 76 09:21 pts/2    00:00:10 java -Dzookeeper.something..something 

The supervisord config file looks like:

[program:zookeeper] command=zkServer.sh start-foreground autorestart=true stopsignal=KILL 

These kind of processes which have multiple childs are not well handled by supervisord when it comes to stopping them from supervisorctl. So when I run this from the supervisord and try to stop it from supervisorctl, only the top level process gets killed but not the actual java process.

Answer 1

The same problem was encountered by Rick Hanlon II here: https://coderwall.com/p/4tcw7w

Option stopasgroup=true should be set in the program section for supervisord to stop not only the parent process but also the child processes.

The example is given as:

[program:some_django]  command=python manage.py runserver  directory=/dir/to/app  stopasgroup=true 

Also, have in mind that you may have an older package of supervisord that does not have "stopasgroup" functionality. I tried these Debian packages on Raspberry Pi:

• supervisor_3.0a8 does not work.
• supervisor_3.0b2-1 works as expected.

Answer 2

Doing the following early in the main bash script called by supervisord fixed the problem for me:

trap "kill -- -$$" EXIT 

This kills the entire process group when the main script exits, such as when it is killed by supervisord.