前言

本节内容我们主要介绍一下如何在centos系统下搭建一套高可用的zookeeper集群,zookeeper是我们常用的中间键之一,例如使用zookeeper实现分布式锁、Hadoop集群高可用、kafka集群高可用等等。我们以以下三台服务器为例:

zookeeper服务器
IP地址主机名
192.168.10.101hadoop101
192.168.10.102hadoop102
192.168.10.103hadoop103

正文

①上传zookeeper安装包到101服务器/opt/software目录下

②解压zookeeper安装包到/opt/module目录下

命令:

tar -zxvf zookeeper-3.4.10.tar.gz -C /opt/module/

③创建zookeeper数据存储目录zkdata

命令:

mkdir -p /opt/module/zookeeper-3.4.10/zkdata

④分发zookeeper安装包到其它俩台服务器

命令:

hsync zookeeper-3.4.10

⑤分别在三台服务的zookeeper数据目录下创建myid文件,并分别写入内容1、2、3

⑥ 修改zookeeper配置文件

# The number of milliseconds of each ticktickTime=2000# The number of ticks that the initial # synchronization phase can takeinitLimit=10# The number of ticks that can pass between # sending a request and getting an acknowledgementsyncLimit=5# the directory where the snapshot is stored.# do not use /tmp for storage, /tmp here is just # example sakes.dataDir=/opt/module/zookeeper-3.4.10/zkdata# the port at which the clients will connectclientPort=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#######################zookeeper cluster config##########################server.1=hadoop101:2888:3888server.2=hadoop102:2888:3888server.3=hadoop103:2888:3888

配置参数说明:

server.A=B:C:D

-A:是一个数字,表示这个是第几号服务器,集群模式下配置一个文件myid,这个文件在dataDir目录下,这个文件里面有一个数据就是A的值,Zookeeper启动时读取此文件,拿到里面的数据与zoo.cfg里面的配置信息比较从而判断到底是哪个server

– B:这个服务器的ip地址或者主机名(需映射)

– C:服务器与集群中的Leader服务器交换信息的端口,用于传递数据

– D:集群中的Leader服务器挂了,需要一个端口来重新进行选举,选出一个新的Leader,而这个端口就是用来执行选举时服务器相互通信的端口

⑦同步zookeeper配置文件zoo.cfg到其它服务器

⑧分别启动zookeeper,并查看zookeeper集群状态

命令:

#启动bin/zkServer.sh start#查看状态bin/zkServer.sh status#停止bin/zkServer.sh stop

⑨在/opt/module/zookeeper-3.4.10/bin目录下创建一个zookeeper集群启动、关闭、查看状态的脚本myzookeeper.sh

#!/bin/bashif [ $# -lt 1 ]then echo "No Args Input..." exit ;ficase $1 in"start") echo " =================== 启动 zookeeper 集群 ===================" ssh hadoop101 "/opt/module/zookeeper-3.4.10/bin/zkServer.sh start" ssh hadoop102 "/opt/module/zookeeper-3.4.10/bin/zkServer.sh start" ssh hadoop103 "/opt/module/zookeeper-3.4.10/bin/zkServer.sh start" ;;"stop") echo " =================== 关闭 zookeeper 集群 ===================" ssh hadoop101 "/opt/module/zookeeper-3.4.10/bin/zkServer.sh stop" ssh hadoop102 "/opt/module/zookeeper-3.4.10/bin/zkServer.sh stop" ssh hadoop103 "/opt/module/zookeeper-3.4.10/bin/zkServer.sh stop" ;;"status") echo " =================== 查看 zookeeper 集群状态 ===================" ssh hadoop101 "/opt/module/zookeeper-3.4.10/bin/zkServer.sh status" ssh hadoop102 "/opt/module/zookeeper-3.4.10/bin/zkServer.sh status" ssh hadoop103 "/opt/module/zookeeper-3.4.10/bin/zkServer.sh status";;*) echo "Input Args Error...";;esac

⑩配置zookeeper环境变量,并使环境变量生效source /etc/profile

结语

至此,关于zookeeper集群的搭建安装到这里就结束了,我们下期见。。。。。。