This file is an Ubuntu init script for Unicorn

unicorn_init_script.sh

#!/bin/sh
#
# init.d script for single or multiple unicorn installations. Expects at least one .conf 
# file in /etc/unicorn
#
# Modified by jay@gooby.org http://github.com/jaygooby
# based on http://gist.github.com/308216 by http://github.com/mguterl
#
## A sample /etc/unicorn/my_app.conf
## 
## RAILS_ENV=production
## RAILS_ROOT=/var/apps/www/my_app/current
#
# This configures a unicorn master for your app at /var/apps/www/my_app/current running in
# production mode. It will read config/unicorn.rb for further set up. 
#
# You should ensure different ports or sockets are set in each config/unicorn.rb if
# you are running more than one master concurrently.
#
# If you call this script without any config parameters, it will attempt to run the
# init command for all your unicorn configurations listed in /etc/unicorn/*.conf
#
# /etc/init.d/unicorn start # starts all unicorns
#
# If you specify a particular config, it will only operate on that one
#
# /etc/init.d/unicorn start /etc/unicorn/my_app.conf

set -e

cmd () {

  case $1 in
    start)
      echo $DAEMON_OPTS
      start-stop-daemon --start --quiet --pidfile $PID \
                --exec $DAEMON -- $DAEMON_OPTS || true
      echo "Starting with config: $RAILS_ROOT/config/unicorn.rb"
      ;;  
    stop)
      start-stop-daemon --stop --quiet --pidfile $PID || true
      echo "Stopping with config: $RAILS_ROOT/config/unicorn.rb"
      ;;  
    restart|reload)
      start-stop-daemon --stop --quiet --pidfile $PID || true
      echo "Stopping with config: $RAILS_ROOT/config/unicorn.rb"
      sleep 1
      start-stop-daemon --start --quiet --pidfile $PID \
                --exec $DAEMON -- $DAEMON_OPTS || true
      echo "Starting with config: $RAILS_ROOT/config/unicorn.rb"
      ;;  
    *)  
      echo >&2 "Usage: $0 <start|stop|restart>"
      exit 1
      ;;  
    esac
}

setup () {

  export PID=$RAILS_ROOT/tmp/pids/unicorn.pid
  export OLD_PID="$PID.oldbin"

  DAEMON="`which unicorn_rails`"
  DAEMON_OPTS="-c $RAILS_ROOT/config/unicorn.rb -E $RAILS_ENV -D"
}

start_stop () {
  
  # either run the start/stop/reload/etc command for every config under /etc/unicorn
  # or just do it for a specific one

  # $1 contains the start/stop/etc command
  # $2 if it exists, should be the specific config we want to act on
  if [ $2 ]; then
    . $2
    setup
    cmd $1
  else
    for CONFIG in /etc/unicorn/*.conf; do
      # import the variables
      . $CONFIG
      setup

      # run the start/stop/etc command
      cmd $1
    done
   fi
}

ARGS="$1 $2"
start_stop $ARGS