How to add a delay to supervised process in supervisor - linux

Question

I added a bottle server that uses python's cassandra library, but it exits with this error:
Bottle FATAL Exited too quickly (process log may have details)
log shows this:
File "/usr/local/lib/python2.7/dist-packages/cassandra/cluster.py", line 1765, in _reconnect_internal raise NoHostAvailable("Unable to connect to any servers", errors)

So I tried to run it manually using supervisorctl start Bottle ,and then it started with no issue. The conclusion= Bottle service starts too fast (before the needed cassandra supervised service does): a delay is needed!

Solution 1

Not happy enough with the sleep hack I created a startup script and launched supervisorctl start processname from there.

[program:startup]
command=/startup.sh
startsecs = 0
autostart = true
autorestart = false
startretries = 1
priority=1

[program:myapp]
command=/home/website/venv/bin/gunicorn /home/website/myapp/app.py
autostart=false
autorestart=true
process_name=myapp

startup.sh

#!/bin/bash
sleep 5
supervisorctrl start myapp

This way supervisor will fire the startup script once and this will start myapp after 5 seconds, mind the autostart=false and autorestart=true on myapp.

Solution 2

This is what I use:

[program:uwsgi]
command=bash -c 'sleep 5 && uwsgi /etc/uwsgi.ini'

Comments

[Slotos]

command=bash -c "sleep 5 && exec uwsgi /etc/uwsgi.ini": exec will replace bash with uwsgi, double quotes will ensure that enclosed string will be sent to bash as a single argument.

[kgreenek]

When I do this, the process keeps running in the background after i do "supervisorctl stop"

[Torsten Bronger]

@kgreenek Yes, and the previous comment will fix that. Unless your actual program is broken.