Supervisor

Links

http://supervisord.org/ Supervisor is a client/server system that allows its users to monitor and control a number of processes on UNIX-like operating systems.
Snippets - uwsgi

Install

Note: Better to install using apt-get rather than pip because then you get all the init.d scripts:

sudo apt-get install supervisor

Usage

sudo /etc/init.d/supervisor start

Test

To create a test application:

sudo vim /etc/supervisor/conf.d/foo.conf

[program:foo]
command=/bin/cat

Control

Start the shell (type help for help):

sudo supervisorctl

To list processes run status:

supervisor> status
uwsgi                            RUNNING    pid 15435, uptime 0:27:13

Reload

supervisor> reread
supervisor> update

# or...
supervisorctl update

Issues

Another program is already

Starting supervisor:
Error: Another program is already listening on a port that one of our HTTP
servers is configured to use.

To solve this issue:

sudo unlink /var/run/supervisor.sock

Weird/repeating errors

I think supervisor caches the contents of the config file. I had an issue where I updated my python path to use a virtualenv and it couldn’t import packages which had been installed.

To solve the issue make sure the config file is reread, reload, update (or something)…