init script for unicorn on RHEL, Cent OS, Scientific Linux way

etc init.d unicorn-redmine

#!/bin/sh
#
# unicorn_redmine        Startup script for unicorn for redmine
#
# chkconfig: - 86 14
# processname: unicorn_rails
# pidfile: /opt/redmine/tmp/pids/unicorn.pid
# description: Rails application server for Redmine
#
### BEGIN INIT INFO
# Provides: unicorn_redmine
# Required-Start: $local_fs $remote_fs $network
# Required-Stop: $local_fs $remote_fs $network
# Default-Start: 3
# Default-Stop: 0 1 2 4 5 6
# Short-Description: start and stop unicorn
### END INIT INFO

# Source function library.
. /etc/rc.d/init.d/functions

prog=unicorn
#ruby_home=/opt/ruby-enterprise-1.8.7-2012.02
RAILS_ROOT=/opt/redmine
UNICORN_CONF=$RAILS_ROOT/config/unicorn.rb
lockfile=${LOCKFILE-/var/lock/subsys/unicorn}
pidfile=$RAILS_ROOT/tmp/pids/unicorn.pid
SLEEPMSEC=100000
RETVAL=0
ENV=production
SUB_PATH=/redmine

start() {
    echo -n $"Starting $prog: "
    cd $RAILS_ROOT
#    $ruby_home/bin/unicorn_rails -c $UNICORN_CONF -E production -D --path /redmine
    /usr/bin/bundle exec unicorn_rails -c $UNICORN_CONF -E $ENV -D --path $SUB_PATH
    RETVAL=$?
    echo
    [ $RETVAL = 0 ] && touch ${lockfile}
    return $RETVAL
}

stop() {
    echo -n $"Stopping $prog: "
    killproc -p ${pidfile} ${prog} -QUIT
    RETVAL=$?
    echo
    [ $RETVAL = 0 ] && rm -f ${lockfile} ${pidfile}
}

restart() {
    echo -n $"Restarting $prog: "
    killproc -p ${pidfile} ${prog} -USR2
    RETVAL=$?
    echo
}

reload() {
    echo -n $"Reloading $prog: "
    killproc -p ${pidfile} ${prog} -HUP
    RETVAL=$?
    echo
}

rh_status() {
    status -p ${pidfile} ${prog}
}

# See how we were called.
case "$1" in
    start)
        rh_status >/dev/null 2>&1 && exit 0
        start
        ;;
    stop)
        stop
        ;;
    status)
        rh_status
        RETVAL=$?
        ;;
    restart)
        restart
        ;;
    upgrade)
        upgrade
        ;;
    condrestart|try-restart)
        if rh_status >/dev/null 2>&1; then
            stop
            start
        fi
        ;;
    force-reload|reload)
        reload
        ;;
    configtest)
        configtest
        ;;
    *)
        echo $"Usage: $prog {start|stop|restart|condrestart|try-restart|force-reload|upgrade|reload|status|help|configtest}"
        RETVAL=2
esac

exit $RETVAL

before do this, we should consider add a wrappers first for ruby. Here's the detail:

http://rvm.io/integration/init-d