CentOS memcached multiple instances init script

memcached.sh

#! /bin/sh
#
# chkconfig: - 55 45
# description:  The memcached daemon is a network memory cache service.
# processname: memcached
# pidfile: /var/run/memcached/memcached_*.pid

# Standard LSB functions
#. /lib/lsb/init-functions

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

#ports that memcached will listen
PORTS=(11211 11212)
USER=memcached
MAXCONN=1024
CACHESIZE=64
OPTIONS=""

# Check that networking is up.
. /etc/sysconfig/network

if [ "$NETWORKING" = "no" ]
then
    exit 0
fi

RETVAL=0
prog="memcached"
pidfile_prefix="/var/run/memcached/memcached_"
pidfile_suffix=".pid"
lockfile="/var/lock/subsys/memcached"

INSTANCE_NUM=${#PORTS[@]}

start () {
    echo -n $"Starting $prog: "
    # Ensure that $pidfile directory has proper permissions and exists
    piddir=`dirname $pidfile_prefix`
    if [ ! -d $piddir ]; then
        mkdir $piddir
    fi
    if [ "`stat -c %U $piddir`" != "$USER" ]; then
        chown $USER $piddir
    fi
    for ((i=0; i < $INSTANCE_NUM; i++)); do
        pidfile=$pidfile_prefix${PORTS[${i}]}$pidfile_suffix
        daemon --pidfile ${pidfile} memcached -d -p ${PORTS[${i}]} -u $USER  -m $CACHESIZE -c $MAXCONN -P ${pidfile} $OPTIONS
        RETVAL=$?
        if [ $RETVAL -ne 0 ] ; then
            echo "Start instance with port ${PORTS[${i}]} failed!"
        else 
            touch ${lockfile}
        fi;
    done;
    echo
}
stop () {
    echo -n $"Stopping $prog: "
    for ((i=0; i < $INSTANCE_NUM; i++)); do
        pidfile=$pidfile_prefix${PORTS[${i}]}$pidfile_suffix
        killproc -p ${pidfile} /usr/bin/memcached
        RETVAL=$?
        if [ $RETVAL -ne 0 ] ; then
            echo "Stop instance with port ${PORTS[${i}]} failed!"
        else 
            rm -f ${pidfile}
        fi;
    done;
    echo
    rm -f ${lockfile}
}

restart () {
    stop
    start
}


# See how we were called.
case "$1" in
    start)
      start
      ;;
    stop)
      stop
      ;;
    restart|reload|force-reload)
      restart
      ;;
    condrestart|try-restart)
      [ -f ${lockfile} ] && restart || :
      ;;
    *)
      echo $"Usage: $0 {start|stop|status|restart|reload|force-reload|condrestart|try-restart}"
      RETVAL=2
          ;;
esac
exit $RETVAL