zookeeper 3.4.6集群搭建

这里以三台虚拟机为例搭建zookeeper集群

1、新建三台虚拟机

分别命名hadoop01、hadoop02、hadoop03

hostnamectl set-hostname <your new hostname>

在一切开始之前，需要

• 安装java环境：http://blog.kdyzm.cn/post/53
• 配置ssh免登录：http://blog.kdyzm.cn/post/19

2、配置hosts文件

三台虚拟机分别配置hosts文件

[root@hadoop01 local]# vim /etc/hosts

192.168.3.21 hadoop01
192.168.3.22 hadoop02
192.168.3.23 hadoop03

3、官网下载zookeeper3.4.6

官网地址：https://zookeeper.apache.org/releases.html

官网下载地址：https://archive.apache.org/dist/zookeeper/

直接下载地址：https://archive.apache.org/dist/zookeeper/zookeeper-3.4.6/zookeeper-3.4.6.tar.gz

下载之后使用工具上传到 hadoop01机器的/usr/local文件夹，使用命令

cd /usr/local
tar -zxvf zookeeper-3.4.6.tar.gz

解压到当前目录，并且建立软链接

ln -s zookeeper-3.4.6 zookeeper

4、配置环境变量

[root@hadoop01 local]# vim /etc/profile

export ZOOKEEPER_HOME=/usr/local/zookeeper-3.4.6
export PATH=$PATH:$ZOOKEEPER_HOME/bin

将配置文件复制到其它两台机器

5、创建数据目录

[root@hadoop01 zookeeper]# mkdir /usr/local/zookeeper/zkdata

6、修改配置文件

[root@hadoop01 conf]# cd /usr/local/zookeeper/conf
[root@hadoop01 conf]# cp zoo_sample.cfg zoo.cfg 

修改data_dir目录

dataDir=/usr/local/zookeeper/zkdata

新增集群配置

server.1=hadoop01:2888:3888
server.2=hadoop02:2888:3888
server.3=hadoop03:2888:3888

7、新增myid文件

[root@hadoop01 conf]# vim /usr/local/zookeeper/zkdata/myid 
1

8、复制程序到其它两个节点

[root@hadoop01 conf]# scp -r /usr/local/zookeeper-3.4.6 hadoop02:/usr/local
[root@hadoop01 conf]# scp -r /usr/local/zookeeper-3.4.6 hadoop03:/usr/local

9、修改剩余两个节点的myid

[root@hadoop02 conf]# vim /usr/local/zookeeper/zkdata/myid 
2

[root@hadoop03 conf]# vim /usr/local/zookeeper/zkdata/myid 
3

10、启动服务

从第一台机器开始分别启动zookeeper

[root@hadoop01 conf]# /usr/local/zookeeper/bin/zkServer.sh start
[root@hadoop02 conf]# /usr/local/zookeeper/bin/zkServer.sh start
[root@hadoop03 conf]# /usr/local/zookeeper/bin/zkServer.sh start

11、验证服务

在每个机器上运行jps命令

[root@hadoop01 conf]# jps
2356 Jps
1901 QuorumPeerMain

QuorumPeerMain能看到的话就表明程序启动没问题了；接下来验证下每个服务的运行模式

在每个机器上运行命令： /usr/local/zookeeper/bin/zkServer.sh status

[root@hadoop01 conf]# /usr/local/zookeeper/bin/zkServer.sh status
JMX enabled by default
Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg
Mode: follower

[root@hadoop02 conf]#  /usr/local/zookeeper/bin/zkServer.sh status
JMX enabled by default
Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg
Mode: leader

[root@hadoop03 .ssh]# /usr/local/zookeeper/bin/zkServer.sh status
JMX enabled by default
Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg
Mode: follower

可以看到hadoop01、hadoop03运行在follower模式，hadoop02运行在leader模式；最后简单链接zk运行简单的命令

[root@hadoop01 bin]# /usr/local/zookeeper/bin/zkCli.sh -server localhost:2181
Connecting to localhost:2181
....此处省略若干日志
[zk: localhost:2181(CONNECTED) 0] ls /
[zookeeper, test]
[zk: localhost:2181(CONNECTED) 1] create /kdyzm hello
Created /kdyzm
[zk: localhost:2181(CONNECTED) 2] get /kdyzm
hello
cZxid = 0x100000005
ctime = Wed Sep 28 00:58:40 CST 2022
mZxid = 0x100000005
mtime = Wed Sep 28 00:58:40 CST 2022
pZxid = 0x100000005
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 5
numChildren = 0
[zk: localhost:2181(CONNECTED) 3] delete /kdyzm
[zk: localhost:2181(CONNECTED) 4] 

这样就表示已经完全成功了

service脚本

vim /etc/init.d/zookeeper

#!/bin/bash
#chkconfig:2345 20 90
#description:zookeeper
#processname:zookeeper
export JAVA_HOME=//usr/local/jdk
case $1 in
        start) su root /usr/local/zookeeper/bin/zkServer.sh start;;
        stop) su root /usr/local/zookeeper/bin/zkServer.sh stop;;
        status) su root /usr/local/zookeeper/bin/zkServer.sh status;;
        restart) su /usr/local/zookeeper/bin/zkServer.sh restart;;
        *) echo "require start|stop|status|restart" ;;
esac

修改完了之后使用命令

chmod a+x /etc/init.d/zookeeper

为启动脚本加上执行权限

注意：本文归作者所有，未经作者允许，不得转载