Shutting down Docker containers via supervisor

Question

I\'m unable to shut down Docker containers that were launched by supervisor through supervisorctl stop all. Even through supervisorctl status shows the

Answer 1

I think I found the problem. I didn't realise it, but there's multiple ways of starting a program when a docker container is fired up.

Apparently CMD myexec param1 param2 starts a shell which in turn starts myexec (in fact these two processes are visible in the container with /bin/sh -c myexec... at PID 1. A better way is to start the program directly (in my case supervisord).

On the other hand, CMD ["/usr/bin/python", "/usr/local/bin/supervisord", "-c", "/root/supervisord.conf", "--nodaemon"] worked fine. I am now able to start and stop the docker container through supervisor.

Here's the relevant section in the docker docs:

The CMD instruction has three forms:

CMD ["executable","param1","param2"] (exec form, this is the preferred form)

CMD ["param1","param2"] (as default parameters to ENTRYPOINT)

CMD command param1 param2 (shell form)

Update

Example supervisor file (inside Docker container):

[program:app]
command=python run_web_server.py
stdout_logfile=/var/log/app/app.log
directory=/opt/app
autostart=true
autorestart=false
stopsignal=INT
redirect_stderr=true
startretries=0
stopasgroup=true
killasgroup=true


[unix_http_server]
file=/var/run/supervisor.sock
chmod=0700

[supervisord]
logfile=/var/log/supervisor/supervisord.log
pidfile=/var/run/supervisord.pid
childlogdir=/var/log/supervisor

[rpcinterface:supervisor]
supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface

[supervisorctl]
serverurl=unix:///var/run/supervisor.sock

The mako template to generate the Docker (outside) supervisor file:

[program:container]
command=docker run --rm --name ${name} \
% if container_links is not UNDEFINED:
% for host in container_hosts:
--add-host ${host['name']}:${host['ip']} \
% endfor
% endif
% if container_links is not UNDEFINED:
% for link in container_links:
--link ${link}:${link} \
% endfor
% endif
% if port_mappings is not UNDEFINED:
% for ext in port_mappings:
-p ${ext}:${port_mappings[ext]} \
% endfor
% endif
-e "INSTANCE_NAME=${name}" \
-e "TZ=${timezone}" \
% if environ is not UNDEFINED:
% for k in environ:
-e "${k}=${environ[k]}" \
% endfor
% endif
-v ${deployment_dir}/tmp:${deployment_dir}/app/tmp \
... more -v
-i foo/app-${version}:${type}
stdout_logfile=${deployment_dir}/log/${name}.log
redirect_stderr=true
autostart=false
autorestart=false
% if priority is not UNDEFINED:
priority=${priority}
% endif
startretries=0
# stopasgroup=true
# killasgroup=true