Linux安装、配置Zookeeper

解压zooke压缩包，并将conf文件夹下面的zoo_sample.cfg复制并改名为zoo.cfg

tar -zxvf zookeeper-3.4.14.tar.gz -C /opt/module/

cd /usr/local/bin/zookeeper-3.4.14/conf
cp zoo_sample.cfg zoo.cfg

修改配置文件

#创建目录
[root@localhost]# mkdir /usr/local/bin/zookeeper-3.4.14/dataDir
[root@localhost]# mkdir /usr/local/bin/zookeeper-3.4.14/logDir

#修改配置文件
dataDir=/usr/local/bin/zookeeper-3.4.14/dataDir
dataLogDir=/usr/local/bin/zookeeper-3.4.14/logDir

配置环境变量

#环境配置文件
vim /etc/profile

#添加
export ZOOKEEPER_HOME=/usr/local/bin/zookeeper-3.4.14
export PATH=$PATH:$ZOOKEEPER_HOME/bin

#重新加载环境配置
[root@localhost]# source /etc/profile

服务启动、客户端连接

[root@localhost ~]# cd /usr/local/bin/zookeeper-3.4.14/bin
#开启服务
[root@localhost bin]# zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /usr/local/bin/zookeeper-3.4.14/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

#停止服务
[root@localhost zookeeper-3.4.14]# zkServer.sh stop
ZooKeeper JMX enabled by default
Using config: /usr/local/bin/zookeeper-3.4.14/bin/../conf/zoo.cfg
Stopping zookeeper ... STOPPED

#连接
[root@localhost zookeeper-3.4.14]# zkCli.sh
#指定服务器连接
[root@localhost zookeeper-3.4.14]# zkCli.sh -server ip:port
    
#退出
quit、ctrl + C

客户端命令

#创建普通节点
[zk: localhost:2181(CONNECTED) 44] ls /              
[zookeeper]
[zk: localhost:2181(CONNECTED) 45] create /groupA 1
Created /groupA
[zk: localhost:2181(CONNECTED) 46] create /groupB 1
Created /groupB
[zk: localhost:2181(CONNECTED) 47] ls /
[zookeeper, groupA, groupB]

#创建-s短暂、-e带序号的节点(重启客户端后短暂节点消失)
WatchedEvent state:SyncConnected type:None path:null
[zk: localhost:2181(CONNECTED) 0] create -e -s /servers/server ss
Created /servers/server0000000012
[zk: localhost:2181(CONNECTED) 1] create -e -s /servers/server ssd
Created /servers/server0000000013
[zk: localhost:2181(CONNECTED) 2] ls /
[servers, zookeeper]
[zk: localhost:2181(CONNECTED) 3] ls /servers/server
server  server0000000013   server0000000012

#修改
[zk: localhost:2181(CONNECTED) 26] get /
zookeeper   groupA
[zk: localhost:2181(CONNECTED) 27] set /groupA gogo
[zk: localhost:2181(CONNECTED) 29] get /groupA
gogo

#删除
[zk: localhost:2181(CONNECTED) 18] ls /
[zookeeper, groupA]
[zk: localhost:2181(CONNECTED) 19] delete /groupA
Node not empty: /groupA #删除的节点，子节点不能有值
[zk: localhost:2181(CONNECTED) 20] ls /groupA
[A]
[zk: localhost:2181(CONNECTED) 21] delete /groupA/A
[zk: localhost:2181(CONNECTED) 22] delete /groupA  
[zk: localhost:2181(CONNECTED) 23] ls /
[zookeeper]
#递归删除
[zk: localhost:2181(CONNECTED) 8] rmr /groupA   

#监听，一次有效
[zk: localhost:2181(CONNECTED) 35] get /groupA watch
#变化后的提示消息
WatchedEvent state:SyncConnected type:NodeDataChanged path:/groupA

#查看节点状态
[zk: localhost:2181(CONNECTED) 28] get /country/USA
2st
cZxid = 0x8 #创建节点的事务zxid
ctime = Tue Sep 08 22:40:01 CST 2020 #被创建的毫秒数（从1970年开始）
mZxid = 0x8 #最后更新的事务zxid
mtime = Tue Sep 08 22:40:01 CST 2020 #最后修改的毫秒数
pZxid = 0x8 #最后更新的子节点
cversion = 0 #子节点变化号，znode子节点修改次数
dataVersion = 0 #数据变化号
aclVersion = 0 #访问控制列表的变化号
ephemeralOwner = 0x1000024798d0002 #如果是临时节点，这个是znode拥有者的sessionId，如果不是临时节点就是0
dataLength = 2 #znode的数据长度
numChildren = 0 #子节点数量
[zk: localhost:2181(CONNECTED) 4]

报错

删除缓存的version-2文件夹其实就是删除了已经create的节点，重启zookeeper就可以解决报错。

在每次新建一个节点时，一定要判断该节点（路径）是否存在，因为在ZooKeeper中路径使唯一的，所以当在该路径下已有节点时，继续往当前路径上新建节点就会报这个错。

集群配置

在dataDir目录下创建myid并设置编号

[root@vmware103 dataDir]# touch myid
[root@vmware103 dataDir]# vi myid

配置集群

A代表第几号服务器、B代表服务IP地址、C是服务器与集群Leader服务器交互数据的端口、D是万一集群的Leader服务器挂了，需要一个端口来重新进行选举。

server.A=B:C:D

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

#如果需要搭建集群的话，需要在在clientPort下面添加服务器的ip
server.2=192.168.17.102:2888:3888
server.3=192.168.17.103:2888:3888
server.4=192.168.17.104:2888:3888
server.5=192.168.17.105:2888:3888
server.6=192.168.17.106:2888:3888

查看zookeeper状态

#1号服务器变成follower
[root@localhost bin]# jps
6120 Jps
5854 QuorumPeerMain
[root@localhost bin]# zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /usr/local/bin/zookeeper-3.4.14/bin/../conf/zoo.cfg
Mode: follower
[root@localhost bin]# 

#3号变成leader
[root@localhost bin]# zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /usr/local/bin/zookeeper-3.4.14/bin/../conf/zoo.cfg
Mode: leader
[root@localhost bin]# 

#后面启动的服务器状态
[root@localhost bin]# zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /usr/local/bin/zookeeper-3.4.14/bin/../conf/zoo.cfg
Mode: standalone