Installing Standalone Zookeeper on RHEL and set it up as a service

Installation

First Lets make sure java is installed

yum install java-1.8.0-openjdk-src.x86_64

Download the latest version of zookeeper and pick the latest avaiable.

cd /tmp && mkdir zookeeper && cd zookeeper/ && wget http://apache.org/dist/zookeeper/current/zookeeper-3.4.10.tar.gz

Add zookeeper user

useradd zookeeper & passwd zookeeper

Unzip zookeeper binaries

cd /opt && tar xvzf /tmp/zookeeper/zookeeper-3.4.10.tar.gz

Create the softlink /opt/zookeeper

ln -s /opt/zookeeper-3.4.10 /opt/zookeeper

Create /var/lib/zookeeper to store the idfile and data

mkdir /var/lib/zookeeper

Rename zoo_sample.cfg to zoo.cfg

cd /opt/zookeeper/conf && cp zoo_sample.cfg zoo.cfg

Update the zoo.cfg to update the new datadir

dataDir=/var/lib/zookeeper

Add following line to /opt/zookeeper/bin/zkServer.sh: ZOO_LOG_DIR=/opt/zookeeper before line # use POSTIX interface, symlink is followed automatically

Change owernership and permissions on all zookeeper relared dirs

chown -R zookeeper:zookeeper /opt/zookeeper-3.4.10 && chown -R zookeeper:zookeeper /opt/zookeeper && chown -R zookeeper:zookeeper /var/lib/zookeeper

Add zookeper user to sudoers as NOPASSWD :

zookeeper ALL=(ALL) NOPASSWD: ALL

FInally start stop the service from /opt/zookeeper/ dir as

bin/zkServer.sh start

At this time we are done with the installation and this next section talks about how to set it up as a service

Setting it as a Service

Create following file in /etc/init.d folder by the name 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

Change permissions on the init file

Chmod 755 /etc/init.d/zookeeper

Start/stop/restart zookeeper by using following commands

sudo service zookeeper start
sudo service zookeeper stop
sudo service zookeeper restart
sudo service zookeeper status

Finally add it to boot menu sudo chkconfig zookeeper on

Installation

Setting it as a Service

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