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#!/bin/bash
### BEGIN INIT INFO
# Provides: APPLICATION
# Required-Start: $all
# Required-Stop: $network $local_fs $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Start the APPLICATION unicorns at boot
# Description: Enable APPLICATION at boot time.
### END INIT INFO
#
# Use this as a basis for your own Unicorn init script.
# Change APPLICATION to match your app.
# Make sure that all paths are correct.
 
set -u
set -e
 
# Change these to match your app:
APP_NAME=APPLICATION
APP_ROOT="/srv/$APP_NAME/current"
PID="/srv/$APP_NAME/shared/pids/unicorn.pid"
ENV=production
 
GEM_HOME="/home/unicorn/.rvm/gems/ruby-1.9.2-head"
 
UNICORN_OPTS="-D -E $ENV -c $APP_ROOT/config/unicorn.rb"
 
SET_PATH="cd $APP_ROOT; rvm use 1.9.2-head; export GEM_HOME=$GEM_HOME"
CMD="$SET_PATH; $GEM_HOME/bin/unicorn $UNICORN_OPTS"
 
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 ${1-help} in
start)
sig 0 && echo >&2 "Already running" && exit 0
su - unicorn -c "$CMD"
;;
stop)
sig QUIT && exit 0
echo >&2 "Not running"
;;
force-stop)
sig TERM && exit 0
echo >&2 "Not running"
;;
restart|reload)
sig HUP && echo reloaded OK && exit 0
echo >&2 "Couldn't reload, starting '$CMD' instead"
su - unicorn -c "$CMD"
;;
upgrade)
sig USR2 && exit 0
echo >&2 "Couldn't upgrade, starting '$CMD' instead"
su - unicorn -c "$CMD"
;;
rotate)
sig USR1 && echo rotated logs OK && exit 0
echo >&2 "Couldn't rotate logs" && exit 1
;;
*)
echo >&2 "Usage: $0 <start|stop|restart|upgrade|rotate|force-stop>"
exit 1
;;
esac

Add the script to /etc/init.d/APP_NAME and run the following commands to get it to run on boot:

sudo chmod +x /etc/init.d/APP_NAME

sudo update-rc.d APP_NAME defaults

And that should do it…

출처(Reference) : http://blog.kiskolabs.com/post/722322392/unicorn-init-scripts

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