Unicorn start/stop/restart script for Debian

unicorn.sh

#!/bin/sh

### BEGIN INIT INFO
# Provides:          unicorn-kk
# Required-Start:    $local_fs $remote_fs
# Required-Stop:     $local_fs $remote_fs
# Should-Start:      mysql memcached sphinx-kk
# Should-Stop:       mysql memcached sphinx-kk
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: unicorn kk
# Description:       unicorn kk
### END INIT INFO


set -u
set -e
# Example init script, this can be used with nginx, too,
# since nginx and unicorn accept the same signals

# Feel free to change any of the following variables for your app:
APP_ROOT=/var/www/app/current
PID=/var/www/app/shared/pids/unicorn.pid
ENV=production
CMD="/usr/bin/unicorn_rails -D -E $ENV -c config/unicorn.rb"

old_pid="$PID.oldbin"

cd $APP_ROOT || exit 1

sig () {
	test -s "$PID" && kill -$1 `cat $PID`
}

oldsig () {
	test -s $old_pid && kill -$1 `cat $old_pid`
}

case $1 in
start)
	sig 0 && echo >&2 "Already running" && exit 0
	$CMD
	echo >&2 "Started"
	;;
stop)
	sig QUIT && exit 0
	echo >&2 "Not running"
	;;
force-stop)
	sig TERM && exit 0
	echo >&2 "Not running"
	;;
reload)
	sig HUP && echo reloaded OK && exit 0
	echo >&2 "Couldn't reload"
	#$CMD
	;;
restart)
	sig USR2
	echo >&2 "Starting new master, waiting 10 sec..."
	sleep 10
	echo -n >&2 "Quiting old master... "
	oldsig QUIT
	echo >&2 "done"
	#echo >&2 "Couldn't upgrade, starting '$CMD' instead"
	#$CMD
	;;
rotate)
        sig USR1 && echo rotated logs OK && exit 0
        echo >&2 "Couldn't rotate logs" && exit 1
        ;;
*)
	echo >&2 "Usage: $0 <start|stop|reload|restart|rotate|force-stop>"
	exit 1
	;;
esac

TODO

• restart sleep time
• workers in config
• custom unicorn config
• option to disable current unicorn
• unset variables before run
• better output
• docs / examples
• move to github

This works great! I needed to add the -H option to sudo to be able to use rvm, though. Here's my /etc/unicorn/wsoacert-ci.conf:

RAILS_ENV=ci
RAILS_ROOT=/srv/www/wsoacert/current
USER=wsoaref
START_CMD="/home/wsoaref/.rvm/bin/rvm in $RAILS_ROOT do bundle exec unicorn"
UNICORN_CONFIG=$RAILS_ROOT/config/unicorn.rb

Without -H, the HOME environment variable is not set and RVM complains with Can't find rvm install!

Here's a script that supports RVM properly: https://github.com/knyar/unicorn-rvm-init

Thanks, this looks great.

@patrick-higgins - your code pasted in doesn't contain any "-H"...?