Init Script (RHEL, CentOS) for ZooKeeper + optional configs (assumes zookeeper tarball extracted to /opt/zookeeper)

java.env

# /opt/zookeeper/conf/java.env

ZOO_LOG4J_PROP="INFO,ROLLINGFILE"
ZOO_LOG_DIR="/var/log/zookeeper/"

java.sh

# /etc/profile.d/java.sh

export JAVA_OPTS="-Xms2048m -Xmx2048m"

zoo.cfg

# /opt/zookeeper/conf/zoo.cfg

# The number of milliseconds of each tick
tickTime=2000

# The number of ticks that the initial 
# synchronization phase can take
initLimit=10

# The number of ticks that can pass between 
# sending a request and getting an acknowledgement
syncLimit=5

# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just 
# example sakes.
dataDir=/var/lib/zookeeper/data

# Transaction log
dataLogDir=/var/lib/zookeeper/data-log

# the port at which the clients will connect
clientPort=2181

# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=60
#
# Be sure to read the maintenance section of the 
# administrator guide before turning on autopurge.
#
# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
#autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1

# Cluster servers
server.1=zoo1:2888:3888
server.2=zoo2:2888:3888
server.3=zoo3:2888:3888

zookeeper

#!/bin/bash

# /etc/init.d/zookeeper

# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# 
# ZooKeeper
# 
# chkconfig: 2345 89 9 
# description: zookeeper

# ZooKeeper install path (where you extracted the tarball)
ZOOKEEPER='/opt/zookeeper'

source /etc/rc.d/init.d/functions
source $ZOOKEEPER/bin/zkEnv.sh

RETVAL=0
PIDFILE="/var/lib/zookeeper/data/zookeeper_server.pid"
desc="ZooKeeper daemon"

start() {
  echo -n $"Starting $desc (zookeeper): "
  daemon --user zookeeper $ZOOKEEPER/bin/zkServer.sh start
  RETVAL=$?
  echo
  [ $RETVAL -eq 0 ] && touch /var/lock/subsys/zookeeper
  return $RETVAL
}

stop() {
  echo -n $"Stopping $desc (zookeeper): "
  daemon --user zookeeper $ZOOKEEPER/bin/zkServer.sh stop
  RETVAL=$?
  sleep 5
  echo
  [ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/zookeeper $PIDFILE
}

restart() {
  stop
  start
}

get_pid() {
  cat "$PIDFILE"
}

checkstatus(){
  status -p $PIDFILE ${JAVA_HOME}/bin/java
  RETVAL=$?
}

condrestart(){
  [ -e /var/lock/subsys/zookeeper ] && restart || :
}

case "$1" in
  start)
    start
    ;;
  stop)
    stop
    ;;
  status)
    checkstatus
    ;;
  restart)
    restart
    ;;
  condrestart)
    condrestart
    ;;
  *)
    echo $"Usage: $0 {start|stop|status|restart|condrestart}"
    exit 1
esac

exit $RETVAL

Hi， ross. What's the daemon program?

Daemon is available inside /etc/rc.d/init.d/functions