# zookeeper环境搭建


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- 单机模式

  不作演示

- 伪集群模式

  在一台服务器上运行多个zookeeper，设置不同端口即可，与集群模式类似

- 集群模式

  1. 下载 http://zookeeper.apache.org/releases.html

  2. 解压，比如解压到 /opt 目录下

  3. 在zookeeper目录下创建 data, logs目录

  4. 修改配置文件名 conf目录下 `mv zoo_sample.cfg zoo.cfg`

  5. 在每个data目录下创建一个myid文件，内容分别为1, 2, 3, ...用于记录每个服务器的id

  6. 在每个zoo.cfg配置端口等信息,配置文件示例如下

     ```properties
     # 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=/opt/zookeeper/data
     dataLogDir=/opt/zookeeper/logs
     # 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=0.0.0.0:2888:3888 #当前服务器ip
     server.2=*.*.*.*:2888:3888 #其他服务咕咕Ip
     server.3=*.*.*.*:2888:3888
     ```

  7. 依次启动各个实例