centos安装zookeeper集群

一、三台服务器分别如下：

172.28.5.120：zookeeper120.blockchain.hl95.com

172.28.5.124：zookeeper124.blockchain.hl95.com

172.28.5.125：zookeeper125.blockchain.hl95.com

将域名设置配置到三台服务器的/etc/hosts文件下

172.28.5.120 zookeeper120.blockchain.hl95.com
172.28.5.124 zookeeper124.blockchain.hl95.com
172.28.5.125 zookeeper125.blockchain.hl95.com

二、首先需要安装JAVA环境

参考：https://www.cnblogs.com/sky-cheng/p/10564569.html

三、下载zookeeper

三台服务器均下载

[root@redis-01 src]# cd /usr/local/src/
[root@redis-01 src]# wget http://mirrors.hust.edu.cn/apache/zookeeper/zookeeper-3.4.14/zookeeper-3.4.14.tar.gz

四、解压

[root@redis-01 src]# tar -zxvf zookeeper-3.4.14.tar.gz

五、移动到目标目录

[root@redis-01 src]# mv zookeeper-3.4.14/ ../

六、复制conf下的zoo_sample.cfg为zoo.cfg

[root@redis-01 zookeeper-3.4.14]# cp /usr/local/zookeeper-3.4.14/conf/zoo_sample.cfg /usr/local/zookeeper-3.4.14/conf/zoo.cfg

七、新建数据目录

root@redis-01 zookeeper-3.4.14]# mkdir /usr/local/zookeeper-3.4.14/data

八、新建日志目录

[root@redis-01 zookeeper-3.4.14]# mkdir /usr/local/zookeeper-3.4.14/logs

九、编辑zoo.cfg配置文件

设置dataDir为刚才建立的数据目录,设置dataLogDir为新建的日志目录

[root@redis-01 zookeeper-3.4.14]# vim /usr/local/zookeeper-3.4.14/conf/zoo.cfg

dataDir=/usr/local/zookeeper-3.4.14/data/
dataLogDir=/usr/local/zookeeper-3.4.14/logs

设置3个节点配置

server.1=zookeeper120.blockchain.hl95.com:2888:3888
server.2=zookeeper124.blockchain.hl95.com:2888:3888
server.3=zookeeper125.blockchain.hl95.com:2888:3888

最后配置如下：

# 服务器之间或客户端与服务器之间维持心跳的时间间隔
# tickTime以毫秒为单位。
 tickTime=2000
 # 集群中的follower服务器(F)与leader服务器(L)之间的初始连接心跳数
 initLimit=10
 # 集群中的follower服务器与leader服务器之间请求和应答之间能容忍的最多心跳数
 syncLimit=5
 # 快照保存目录
 # 不要设置为/tmp，该目录重新启动后会被自动清除
 dataDir=/usr/local/zookeeper-3.4.14/data/
# 日志保存目录
 dataLogDir=/usr/local/zookeeper-3.4.14/logs
 # 客户端连接端口
 clientPort=2181
 # 客户端最大连接数。
 # 根据自己实际情况设置，默认为60个
 # maxClientCnxns=60
 # 三个节点配置，格式为：
#     server.服务编号=服务地址、LF通信端口、选举端口

   server.1=zookeeper120.blockchain.hl95.com:2888:3888
   server.2=zookeeper124.blockchain.hl95.com:2888:3888
   server.3=zookeeper125.blockchain.hl95.com:2888:3888

九、将该配置文件复制到其他节点

[root@redis-01 zookeeper-3.4.14]# scp -P25601 /usr/local/zookeeper-3.4.14/conf/zoo.cfg root@172.28.5.124:/usr/local/zookeeper-3.4.14/conf/
root@172.28.5.124's password: 
zoo.cfg                                                                                             100% 1091    54.1KB/s   00:00    
[root@redis-01 zookeeper-3.4.14]# scp -P25601 /usr/local/zookeeper-3.4.14/conf/zoo.cfg  root@172.28.5.125:/usr/local/zookeeper-3.4.14/conf/
root@172.28.5.125's password: 
zoo.cfg                                                                                           100% 1091    52.8KB/s   00:00    

十、在/usr/local/zookeeper-3.4.14/data/目录下创建myid文件，文件内容为在zoo.cfg里节点配置的序号

[root@redis-01 zookeeper-3.4.14]# echo 1 > /usr/local/zookeeper-3.4.14/data/myid 

[root@redis-03 data]# echo 2 >> /usr/local/zookeeper-3.4.14/data/myid

[root@redis-03 data]# echo 3 >> /usr/local/zookeeper-3.4.14/data/myid

十一、配置环境变量

[root@redis-01 data]# echo "export ZK_HOME=/usr/local/zookeeper-3.4.14" >> /etc/profile
[root@redis-01 data]# source /etc/profile
[root@redis-01 data]# echo "export PATH=$ZK_HOME/bin:$PATH" >> /etc/profile
[root@redis-01 data]# source /etc/profile

十二、分别启动zookeeper

[root@redis-01 zookeeper-3.4.14]# zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.4.14/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

三台都启动完毕后，再分别查询状态

[root@redis-01 zookeeper-3.4.14]# zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.4.14/bin/../conf/zoo.cfg
Mode: follower
[root@redis-01 zookeeper-3.4.14]# 

[root@redis-02 zookeeper-3.4.14]# zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.4.14/bin/../conf/zoo.cfg
Mode: follower

[root@redis-03 zookeeper-3.4.14]# zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.4.14/bin/../conf/zoo.cfg
Mode: leader

2个follower和1个leader