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Im looking for something better than sudo restart projectname every time I issue a git pull origin master, which pulls down my latest changes to a Django project. This restart command, I believe, is related to Upstart, which I use to start/top my Gunicorn server process.
This restart causes a brief outage. Users hitting the web server (nginx) will get a 500, because Gunicorn is still restarting. In fact, it seems to restart instantly, but it takes a few seconds for pages to load.
Any ideas on how to make this seamless? Ideally, I'd like to issue my git pull and Gunicorn reloads automatically.
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If you update your Django application, you can restart the Gunicorn process to pick up the changes by typing: sudo systemctl restart gunicorn.
If you are running gunicorn on a port rather than a socket, you can find the process id (pid) of gunicorn using fuser command. Then force gunicorn to reload the code by sending a HUP signal. The command fuser 8000/tcp will list the process ids of all processes using tcp port 8000.
You can tell Gunicorn to reload gracefully using the HUP signal like so:
kill -HUP <pid> (see the FAQ for details)
I use Supervisor to control my Gunicorn server, which allows me to use this (slightly hacky) way of reloading Gunicorn after a deploy:
supervisorctl status gunicorn | sed "s/.*[pid ]\([0-9]\+\)\,.*/\1/" | xargs kill -HUP You could obviously achieve something similar with pidof, or ps.
This is actually run from a Fabric script, so I don't even have to logon to the server at all.
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For those not using supervisord: what Rob said, it works with ps as well,
ps aux |grep gunicorn |grep projectname | awk '{ print $2 }' |xargs kill -HUP If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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