zookeeper集群

背景，在linux中搭建zookeeper集群，zk3节点虚拟机为CentOS6,ip为192.168.1.128，192.168.1.129和192.168.1.130，域名分别为master,worker1,worker2

linux下zookeeper集群

1. 单机与集群

a. 安装

  cd /home/gilbert/app/rar
  tar zxvf zookeeper-3.4.11.tar.gz
  mv zookeeper-3.4.11 /home/gilbert/app/

b. zoo_sample.cfg 复制一份，命名为 zoo.cfg，此即为Zookeeper的配置文件

  
  cd zookeeper-3.4.11/conf
  cp zoo_sample.cfg zoo.cfg

c. 修改配置文件，修改内容如下

  
  # 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=/home/gilbert/app/zookeeper-3.4.11/data   #数据存储目录
  dataLogDir=/home/gilbert/app/zookeeper-3.4.11/log #日志目录#
  # the port at which the clients will connect
  clientPort=2181                                   #zookeeper的服务端口
  # 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
    
  #集群配置server.0、server.1、server.2 为 zk 集群中三个 node 的信息，定义格式为 #hostname:port1:port2，其中 port1 是 node 间通信使用的端口，port2 是node 选举使用的端口，需
  #确保三台主机的这两个端口都是互通的
  server.0=192.168.1.128:2888:3888
  server.1=192.168.1.129:2888:3888
  server.2=192.168.1.130:2888:3888

d. 创建myid文件，在dataDir目录下创建，并且写入内容1加以区分(另外两台服务器内容为2，3)

  
  cd /home/gilbert/app/zookeeper-3.4.11/data
  touch myid
  echo "1" > myid
  more myid #查看内容

e. 启动

  
  cd /home/gilbert/app/zookeeper-3.4.11/bin
  ./zkServer.sh start

f. 查看集群

3台服务器都启动zk后

  #192.168.1.128服务器 服务启动
  [root@master zookeeper-3.4.11]# ./bin/zkServer.sh start
  ZooKeeper JMX enabled by default
  Using config: /home/gilbert/app/zookeeper-3.4.11/bin/../conf/zoo.cfg
  Starting zookeeper ... STARTED
  ​
  #状态查看
  [root@master zookeeper-3.4.11]# ./bin/zkServer.sh status
  ZooKeeper JMX enabled by default
  Using config: /home/gilbert/app/zookeeper-3.4.11/bin/../conf/zoo.cfg
  Mode: follower
  ​
  #192.168.1.129服务器 服务启动
  [root@worker1 zookeeper-3.4.11]# ./bin/zkServer.sh start
  ZooKeeper JMX enabled by default
  Using config: /home/gilbert/app/zookeeper-3.4.11/bin/../conf/zoo.cfg
  Starting zookeeper ... STARTED
  ​
  #状态查看
  [root@worker1 zookeeper-3.4.11]# ./bin/zkServer.sh status
  ZooKeeper JMX enabled by default
  Using config: /home/gilbert/app/zookeeper-3.4.11/bin/../conf/zoo.cfg
  Mode: leader
  ​
  #192.168.1.130服务器 服务启动
  [root@worker2 zookeeper-3.4.11]# ./bin/zkServer.sh start
  ZooKeeper JMX enabled by default
  Using config: /home/gilbert/app/zookeeper-3.4.11/bin/../conf/zoo.cfg
  Starting zookeeper ... STARTED
  ​
  #状态查看
  [root@worker2 zookeeper-3.4.11]# ./bin/zkServer.sh status
  ZooKeeper JMX enabled by default
  Using config: /home/gilbert/app/zookeeper-3.4.11/bin/../conf/zoo.cfg
  Mode: follower
  ​

测试zookeeper高可用性，停掉leader，再次查看其它服务器zk状态，此时130服务器的zk为leader

  
  #192.168.1.129 停掉zk为leader服务器
  [root@worker1 zookeeper-3.4.11]# ./bin/zkServer.sh stop
  ZooKeeper JMX enabled by default
  Using config: /home/gilbert/app/zookeeper-3.4.11/bin/../conf/zoo.cfg
  Stopping zookeeper ... STOPPED
  ​
  #192.168.1.128 状态查看
  [root@master zookeeper-3.4.11]# ./bin/zkServer.sh status
  ZooKeeper JMX enabled by default
  Using config: /home/gilbert/app/zookeeper-3.4.11/bin/../conf/zoo.cfg
  Mode: follower
  ​
  #192.168.1.130 状态查看
  [root@worker2 zookeeper-3.4.11]# ./bin/zkServer.sh status
  ZooKeeper JMX enabled by default
  Using config: /home/gilbert/app/zookeeper-3.4.11/bin/../conf/zoo.cfg
  Mode: leader

再次启动129上的zk，zk为follower了

  
  #192.168.1.129 服务启动
  [root@worker1 zookeeper-3.4.11]# ./bin/zkServer.sh start
  ZooKeeper JMX enabled by default
  Using config: /home/gilbert/app/zookeeper-3.4.11/bin/../conf/zoo.cfg
  Starting zookeeper ... STARTED
  ​
  #状态查看
  [root@worker1 zookeeper-3.4.11]# ./bin/zkServer.sh status
  ZooKeeper JMX enabled by default
  Using config: /home/gilbert/app/zookeeper-3.4.11/bin/../conf/zoo.cfg
  Mode: follower