Running multiple instances of memcached installed via Yum or RPM on CentOS 6.x

etc:init.d:memcached

#!/bin/bash
#
# Init file for memcached
#
# Written by Dag Wieërs <dag@wieers.com>
#
# chkconfig: - 80 12
# description: Distributed memory caching daemon
#
# processname: memcached
# config: /etc/sysconfig/memcached
# config: /etc/memcached.conf

source /etc/rc.d/init.d/functions

### Read configuration
#[ -r "$SYSCONFIG" ] && source "$SYSCONFIG"

FILES=(/etc/sysconfig/memcached_*);
# check for alternative config schema
if [ -r "${FILES[0]}" ]; then
	CONFIGS=();
  	for FILE in "${FILES[@]}";
  	do
		# remove prefix
		#echo "${FILE} ==> file"
		NAME=${FILE#/etc/sysconfig/};
		# check optional second param
		if [ $# -ne 2 ];
		then
		  # add to config array
		  CONFIGS+=($NAME);
		elif [ "$2" == "$NAME" ];
		then
		  # use only one memcached
		  CONFIGS=($NAME);
		  break;
		fi;
  	done;
  if [ ${#CONFIGS[@]} == 0 ];
  then
    echo "Config not exist for: $2" >&2;
    exit 1;
  fi;
else
  CONFIGS=(memcached);
fi;

CONFIG_NUM=${#CONFIGS[@]};
for ((i=0; i < $CONFIG_NUM; i++)); do
  NAME=${CONFIGS[${i}]};
  PIDFILE="/var/run/memcached/${NAME}.pid";
  #echo "LOOP \"$CONFIG_NUM\""
  #echo "config ==> ${NAME}"
  #echo "$PIDFILE ==> PID"

##

RETVAL=0
#prog="memcached"
prog="${NAME}"
source "/etc/sysconfig/${NAME}"
desc="Distributed memory caching"

start() {
	echo -n $"Starting $desc (${NAME}): "
	daemon --pidfile $PIDFILE memcached -P $PIDFILE -d -p $PORT -u $USER -c $MAXCONN -m $CACHESIZE $OPTIONS
	#echo " $prog -d -p $PORT -U $PORT -u $USER -c $MAXCONN -m $CACHESIZE $OPTIONS"
	RETVAL=$?
	echo
	[ $RETVAL -eq 0 ] && touch /var/lock/subsys/$prog
	return $RETVAL
}

stop() {
	echo -n $"Shutting down $desc ($prog): "
	echo "$PIDFILE"
	killproc -p $PIDFILE memcached 
	RETVAL=$?
	echo
	[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/$prog
	return $RETVAL
}

restart() {
	stop
	start
}

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

case "$1" in
  start)
	start
	;;
  stop)
	stop
	;;
  restart)
	restart
	;;
  condrestart)
	[ -e /var/lock/subsys/$prog ] && restart
	RETVAL=$?
	;;
  reload)
	reload
	;;
  status)
	status -p $PIDFILE $prog
	RETVAL=$?
	;;
   *)
	echo $"Usage: $0 {start|stop|restart|condrestart|status}"
	RETVAL=1
esac

##$RETVAL

done;

etc:sysconfig:memcached_11211

# Sample file of configuration to first instance
PORT="11211"
USER="memcached"
MAXCONN="1024"
CACHESIZE="64"
OPTIONS="-l 127.0.0.1"

etc:sysconfig:memcached_11212

# Sample file of configuration to second instance
PORT="11212"
USER="memcached"
MAXCONN="1024"
CACHESIZE="64"
OPTIONS="-l 127.0.0.1"

usage

# $ /etc/init.d/memcached start <configname> - Starts memcache with <configname> settings file.
$ /etc/init.d/memcached start memcached_11211 
$ /etc/init.d/memcached start memcached_11212

# $ /etc/init.d/memcached start - Starts all instances of memcached possible with files prefixed with memcached_ on /etc/sysconfig/
$ /etc/init.d/memcached start

# Alternative way to start
$ service memcached start
$ service memcached start memcached_11211
$ service memcached start memcached_11212

# To stop
$ service memcached stop
$ service memcached stop memcached_11211

# To status
$ service memcached status
$ service memcached status memcached_11211

Taken from: http://addmoremem.blogspot.com.br/2010/09/running-multiple-instances-of-memcached.html