集群所用版本

linux版本：Ubuntu 20.04.1 LTS (GNU/Linux 5.4.0-52-generic x86_64)
zookeeper版本：zookeeper-3.4.10
java版本：java version "1.8.0_231"

1. 集群机器规划
   192.168.100.130 ubuntu01
   192.168.100.131 ubuntu02
   192.168.100.132 ubuntu03
2. 设置集群机器免密登陆
   a.各台机器上执行ssh-keygen -t rsa
   b.分别在三台机器上执行ssh-copy-id root@ubuntu01 ssh-copy-id root@ubuntu02 ssh-copy-id root@ubuntu03
3. 上传解压zookeeper-3.4.10到目录/opt/zookeeper-3.4.10 修改配置文件zoo.cfg如下

tickTime=2000
initLimit=10
syncLimit=5
dataDir=/opt/zookeeper-3.4.10/data
dataLogDir=/opt/zookeeper-3.4.10/datalog
clientPort=2181

autopurge.purgeInterval=1
#以下是集群节点配置，格式为“机器名.myid：数据通信端口：ZooKeeper Leader选举端口”
server.0=ubuntu01:2888:3888
server.1=ubuntu02:2888:3888
server.2=ubuntu03:2888:3888

4. 修改data目录下的myid文件
   ubuntu01
   0
   ubuntu02
   1
   ubuntu03
   2
5. 在/opt/zookeeper-3.4.10/bin下修改文件zkEnv.sh 增加一句JAVA_HOME
   export JAVA_HOME=/opt/jdk1.8.0_231
6. zookeeper集群启动脚本start-zookeeper.sh放置在/opt目录下

#!/bin/bash
case $1 in
start)
  echo -n "Starting zookeeper ... "
  for i in ubuntu01 ubuntu02 ubuntu03; do
    ssh $i "/opt/zookeeper-3.4.10/bin/zkServer.sh start"
  done
  ;;
stop)
  echo -n "Stopping zookeeper ... "
  for i in ubuntu01 ubuntu02 ubuntu03; do
    ssh root@$i "/opt/zookeeper-3.4.10/bin/zkServer.sh stop"
  done
  ;;
status)
  echo  "Status of zookeepers ... "
  for i in ubuntu01 ubuntu02 ubuntu03; do
    echo $i
    ssh root@$i "/opt/zookeeper-3.4.10/bin/zkServer.sh status"
  done
  ;;
time)
  echo  "update time ... "
  for i in ubuntu01 ubuntu02 ubuntu03; do
    echo $i
    ssh root@$i "ntpdate ntp2.aliyun.com"
  done
  ;;
*)
  echo -n "Invalid Command ..."
  ;;
esac

7. 集群启动
   赋予执行权限chomd -R 777 /opt/start-zookeeper.sh
   进入目录/opt 执行命令
   启动./start-start-zookeeper.sh start

Using config: /opt/zookeeper-3.4.10/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper-3.4.10/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper-3.4.10/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

停止./start-start-zookeeper.sh stop

Stopping zookeeper ... ZooKeeper JMX enabled by default
Using config: /opt/zookeeper-3.4.10/bin/../conf/zoo.cfg
Stopping zookeeper ... STOPPED
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper-3.4.10/bin/../conf/zoo.cfg
Stopping zookeeper ... STOPPED
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper-3.4.10/bin/../conf/zoo.cfg
Stopping zookeeper ... STOPPED

状态./start-start-zookeeper.sh status

Status of zookeepers ... 
ubuntu01
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper-3.4.10/bin/../conf/zoo.cfg
Mode: follower
ubuntu02
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper-3.4.10/bin/../conf/zoo.cfg
Mode: leader
ubuntu03
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper-3.4.10/bin/../conf/zoo.cfg
Mode: follower

同步集群时间./start-start-zookeeper.sh time

update time ... 
ubuntu01
12 Nov 22:34:37 ntpdate[6827]: step time server 203.107.6.88 offset 18428.676547 sec
ubuntu02
12 Nov 22:34:44 ntpdate[3541]: step time server 203.107.6.88 offset 21061.548954 sec
ubuntu03
12 Nov 22:34:50 ntpdate[3136]: step time server 203.107.6.88 offset 21061.090135 sec

8. zookeeper启动脚本zkServer.sh分析