Docker, Supervisord and logging - how to consolidate logs in docker logs?

supervisor-stdout requires to install python-pip, which downloads ~150mb, for a container I think is a lot just for install another tool.

Redirecting logfile to /dev/stdout works for me:

stdout_logfile=/dev/stdout
stdout_logfile_maxbytes=0

http://veithen.github.io/2015/01/08/supervisord-redirecting-stdout.html

I agree, not using the daemon mode sounds like the best solution, but I would probably employ the same strategy you would use when you had actual physical servers or some kind of VM setup: centralize logging.

You could use something self-hosted like logstash inside the container to collect logs and send it to a central server. Or use a commercial service like loggly or papertrail to do the same.

I accomplished this using .

Install supervisor-stdout in your Docker image:

RUN apt-get install -y python-pip && pip install supervisor-stdout

Supervisord Configuration

Edit your supervisord.conf look like so:

[program:myprogram]
command=/what/ever/command
stdout_events_enabled=true
stderr_events_enabled=true

[eventlistener:stdout] 
command = supervisor_stdout 
buffer_size = 100 
events = PROCESS_LOG 
result_handler = supervisor_stdout:event_handler

Docker container is like a kleenex, you use it then you drop it. To be "alive", Docker needs something running in foreground (whereas daemons run in background), that's why you are using Supervisord.

So you need to "redirect/add/merge" process output (access and error) to Supervisord output you see when running your container.

As Drew said, everyone is using https://github.com/coderanger/supervisor-stdout to achieve it (to me this should be added to supervisord project!). Something Drew forgot to say, you may need to add

stdout_logfile=/dev/stdout
stdout_logfile_maxbytes=0

To the supervisord program configuration block.

Something very usefull also, imagine your process is logging in a log file instead of stdout, you can ask supervisord to watch it:

[program:php-fpm-log]
command=tail -f /var/log/php5-fpm.log
stdout_events_enabled=true
stderr_events_enabled=true

This will redirect php5-fpm.log content to stdout then to supervisord stdout via supervisord-stdout.