zookeeper 集群搭建

• 准备服务器三台

  server1=192.169.31.121
  server2=192.169.31.152
  server3=192.169.31.226

• 下载zookeeper安装包 下载

  在linux中使用 wget 下在zookeeper安装包

  wget http://mirror.bit.edu.cn/apache/zookeeper/stable/zookeeper-3.4.12.tar.gz
  

• 解压缩

  tar -zxvf zookeeper-3.4.12.tar.gz
  

• 配置服务

  copy zookeeper-3.4.12/conf 下 zoo_sample.cfg 文件重命名为 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.
  # 存储zookeeper快照文件目录
  dataDir=/var/zookeeper
  # the port at which the clients will connect
  # zookeeper服务对外提供服务的端口
  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
  
  # 服务配置
  # 样式
  # server.id=host:port:port
  server.1=192.169.31.121:2999:3999
  server.2=192.169.31.152:2999:3999
  server.3=192.169.31.226:2999:3999
  

  注意：将配分别 scp 到其它的两台 zookeeper conf 中

  scp zoo.cfg root@192.168.226:/opt/zookeeper-3.4.12/conf
  

• 配置 myid 文件

  到 zoo.cfg 中配置的 dataDir=/var/zookeeper 目录，创建 myid 文件

  vim myid 输入当前服务器的id, 保存。
  同样配置其它两台服务器的 myid 文件。

• 启动 zookeeper 服务

  到 /opt/zookeeper-3.4.12/bin 目录下执行命令 ./zkServer.sh start 启动服务，如下则表示服务启动该成功：

  [root@zivs bin]# ./zkServer.sh start
  ZooKeeper JMX enabled by default
  Using config: /opt/zookeeper-3.4.12/bin/../conf/zoo.cfg
  Starting zookeeper ... STARTED
  

• 检查 zookeeper 服务是否对外提供服务

  查看档前服务状态

  [root@zivs bin]# ./zkServer.sh status
  ZooKeeper JMX enabled by default
  Using config: /opt/zookeeper-3.4.12/bin/../conf/zoo.cfg
  Mode: leader
  

  使用 telnet 命令 telnet 192.168.31.121 2181

  [root@zivs bin]# telnet 192.168.31.121 2181
  Trying 192.168.31.121...
  Connected to 192.168.31.121.
  Escape character is '^]'.
  stat
  This ZooKeeper instance is not currently serving requests
  Connection closed by foreign host.
  

  上面的提示说明 zookeeper 服务没有对外提供服务,继续启动其它服务 telnet 如下即表示 zookeeper 集群服务器搭建成功：

  [root@zivs bin]# telnet 192.168.31.121 2181
  Trying 192.168.31.121...
  Connected to 192.168.31.121.
  Escape character is '^]'.
  stat
  Zookeeper version: 3.4.12-e5259e437540f349646870ea94dc2658c4e44b3b, built on 03/27/2018 03:55 GMT
  Clients:
   /192.168.31.121:44360[0](queued=0,recved=1,sent=0)
  
  Latency min/avg/max: 0/0/0
  Received: 2
  Sent: 1
  Connections: 1
  Outstanding: 0
  Zxid: 0x300000000
  Mode: leader
  Node count: 4
  Connection closed by foreign host.
  

  zookeeper 规定一个集群中只有过半的服务启动对外提供服务，该集群才可对外提供服务

  yum install telnet 没有安装 telnet 命令可先通过这个命令先安装 telnet 命令

• zookeeper 集群，伪集群，单机配置

  集群

  # server.id=host:port:port
  server.1=192.169.31.121:2999:3999
  server.2=192.169.31.152:2999:3999
  server.3=192.169.31.226:2999:3999
  

  伪集群 - host 一样 port 不一样

  # server.id=host:port:port
  server.1=192.169.31.121:2997:3997
  server.2=192.169.31.121:2998:3998
  server.3=192.169.31.121:2999:3999
  

  单机 - 一台服务即可

  # server.id=host:port:port
  server.1=192.169.31.121:2997:3997