zookeeper集群搭建详细步骤

搭建说明

前置环境：

	实例1	实例2	实例3
IP	192.168.11.11	192.168.11.12	192.168.11.13
OS	centos7.9	centos7.9	centos7.9
zk	zookeeper-3.8.0	zookeeper-3.8.0	zookeeper-3.8.0
java	JDK8	JDK8	JDK8

安装zookeeper集群依赖java环境，请在三台机器上先自行安装JDK。
如果java环境已就绪，下面开始安装zk集群。

1. 创建目录

# 工作目录
mkdir -p /usr/local/zookeeper

# 日志存储目录
mkdir -p /usr/local/zookeeper/dataDir

在三台实例上重复上述操作

2.安装包

# 下载
cd /usr/local/zookeeper
wget https://mirrors.tuna.tsinghua.edu.cn/apache/zookeeper/zookeeper-3.8.0/apache-zookeeper-3.8.0-bin.tar.gz

# 解压
 tar -zxvf apache-zookeeper-3.8.0-bin.tar.gz  -C /usr/local/zookeeper/

在三台实例上重复上述操作

3.新增实例文件

三台实例分别操作

#实例1
echo "1" > /usr/local/zookeeper/dataDir/myid  
#实例2 
echo "2" > /usr/local/zookeeper/dataDir/myid 
#实例3  
echo "3" > /usr/local/zookeeper/dataDir/myid   

myid文件后续zoo.cfg中使用。

4.配置修改

cd /usr/local/zookeeper/apache-zookeeper-3.8.0-bin/conf
mv zoo_sample.cfg zoo.cfg
vim 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=/usr/local/zookeeper/dataDir
server.1=192.168.11.11:2888:3888
server.2=192.168.11.12:2888:3888
server.3=192.168.11.13:2888:3888
# 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

在三台实例上重复上述操作
也可以在一台机器修改zoo.cfg文件，scp到另外两台机器，命令参考如下：
scp zoo.cfg [email protected]:/usr/local/zookeeper/apache-zookeeper-3.8.0-bin/conf/zoo.cfg

5.关闭防火墙（根据环境不同，可选择性执行）

systemctl stop firewalld
systemctl disable firewalld

若需要关闭防火墙，在三台实例上重复上述操作

6.配置Systemctl zookeeper服务

cd /usr/lib/systemd/system/
#创建zookeeper服务文件
vim zookeeper.service 

[Unit]
Description=zookeeper.service
After=network.target

[Service]
Type=forking
Environment="PATH=/usr/local/jdk1.8.0_311/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin"
User=root
Group=root
ExecStart=/usr/local/zookeeper/apache-zookeeper-3.8.0-bin/bin/zkServer.sh start 
ExecStop=/usr/local/zookeeper/apache-zookeeper-3.8.0-bin/bin/zkServer.sh stop
Restart=on-failure

[Install]
WantedBy=multi-user.target

刷新systemctl

systemctl daemon-reload

设置zookeeper服务开机自启

systemctl enable zookeeper

启动zookeeper

systemctl start zookeeper

在三台实例上重复上述操作

其它操作

关闭zookeeper

systemctl stop zookeeper

重启zookeeper

systemctl restart zookeeper

查看zookeeper实例状态

systemctl status zookeeper

7.查看集群状态

实例1、实例2、实例3分别查看集群状态

/usr/local/zookeeper/apache-zookeeper-3.8.0-bin/bin/zkServer.sh status

查询结果如下：

ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper/apache-zookeeper-3.8.0-bin/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost. Client SSL: false.
Mode: follower

ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper/apache-zookeeper-3.8.0-bin/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost. Client SSL: false.
Mode: leader

ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper/apache-zookeeper-3.8.0-bin/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost. Client SSL: false.
Mode: follower

以上，zookeeper集群搭建完成。