zookeeper安装

准备环境

三节点
- 192.168.10.140 (zookeeper1)
- 192.168.10.141 (zookeeper2)
- 192.168.10.142 (zookeeper3)
版本：apache-zookeeper-3.7.1-bin.tar
jdk:jdk-8u333
上传安装包到三节点的/opt/zookeeper目录
停止/关闭防火墙

配置环境

配置hostname 三台节点配置

# echo "192.168.10.140 zookeeper1" >> /etc/hosts
# echo "192.168.10.141 zookeeper2" >> /etc/hosts
# echo "192.168.10.142 zookeeper3" >> /etc/hosts

安装

解压三台节点全部执行

# tar zxvf apache-zookeeper-3.7.1-bin.tar.gz 
# ln -s ./apache-zookeeper-3.7.1-bin ./zookeeper

创建data目录三台节点全部执行
```
# mkdir -p /data/zookeeper
```

创建 myid 文件

# zk1节点
[root@zookeeper1 conf]# cd /data/zookeeper/
[root@zookeeper1 zookeeper]# echo 1 > myid
[root@zookeeper1 zookeeper]# cat myid 
1

# zk2节点
[root@zookeeper1 conf]# cd /data/zookeeper/
[root@zookeeper1 zookeeper]# echo 2 > myid
[root@zookeeper1 zookeeper]# cat myid 
2

# zk3节点
[root@zookeeper1 conf]# cd /data/zookeeper/
[root@zookeeper1 zookeeper]# echo 3 > myid
[root@zookeeper1 zookeeper]# cat myid 
3

进入到conf目录修改配置文件三台节点都需要修改

# cd /opt/zookeeper/zookeeper/conf/
# cp zoo_sample.cfg zoo.cfg 

#添加dataDir和添加server
# vim zoo.cfg
……
dataDir=/data/zookeeper
# server.1的1 代表每台节点的myid中数值 2888：访问zookeeper的端口；3888：重新选举leader的端口
server.1=zookeeper1:2888:3888
server.2=zookeeper2:2888:3888
server.3=zookeeper3:2888:3888
……

# 完整配置文件
# 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=/data/zookeeper
# 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
#
# 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

## Metrics Providers
#
# https://prometheus.io Metrics Exporter
#metricsProvider.className=org.apache.zookeeper.metrics.prometheus.PrometheusMetricsProvider
#metricsProvider.httpPort=7000
#metricsProvider.exportJvmInfo=true
server.1=zookeeper1:2888:3888
server.2=zookeeper2:2888:3888
server.3=zookeeper3:2888:3888

启动

三台节点进入cd /opt/zookeeper/zookeeper/目录并且启动

# cd /opt/zookeeper/zookeeper/
# ./bin/zkServer.sh start
# 查看状态是否启动城关
# ./bin/zkServer.sh status

# 停止命令
# ./bin/zkServer.sh stop

#根据日志看到 节点2被选为主
# ./bin/zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper/zookeeper/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost. Client SSL: false.
Mode: follower

# ./bin/zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper/zookeeper/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost. Client SSL: false.
Mode: leader

# ./bin/zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper/zookeeper/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost. Client SSL: false.
Mode: follower

测试

客户端链接任意一个节点所有的写入(增删改)都会转发到主节点进行操作，其他查询都是在从节点

# 连接单节点
# bin/zkCli.sh -server 192.168.10.140:2181
[zk: 192.168.10.140:2181(CONNECTED) 0] ls /
[zookeeper]
[zk: 192.168.10.140:2181(CONNECTED) 5] create /test
Created /test
[zk: 192.168.10.140:2181(CONNECTED) 6] ls /

#连接集群 干掉任何一个节点 集群正常
# bin/zkCli.sh -server 192.168.10.140:2181,192.168.10.141:2181,192.168.10.142:2181
[zk: 192.168.10.140:2181,192.168.10.141:2181,192.168.10.142:2181(CONNECTED) 0] ls /
[test, zookeeper]