Zookeeper入门学习（二）--Zookeeper环境搭建

一、Zookeeper环境搭建

• （1）搭建linux服务器，略；
• （2）下载zookeeper安装包到linux并解压，下面的介绍中将zookeeper解压到opt目录下，http://zookeeper.apache.org/

• （3）配置zookeeper/conf/zoo_sample.cfg（此文件为zookeeper的默认配置文件，备份前最好备份一份）

  # The number of milliseconds of each tick# The number of milliseconds of each tick# The number of milliseconds of each tick# sending a request and getting an acknowledgement# sending a request and getting an acknowledgementsyncLimit=5# the directory where the snapshot is stored.# do not use /tmp for storage, /tmp here is just# example sakes. #快照文件的存储目录dataDir=/var/zookeeper  # the port at which the clients will connect#服务器的端口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#server.id=host:port:port  id为服务器的ID，host是服务器的Ip地址,后面的第一个port#为Follower服务器与Leader服务器通信的端口，第二个port专门用于leader选举投票通信用，#这两个端口可以任意填写，只要可用即可server.1=192.168.153.129:2888:3888server.2=192.168.153.132:2888:3888server.3=192.168.153.133:2888:3888

• （4）在/var下创建zookeeper目录，要与第三步中的dataDir配置的目录相同

• （5）在/opt/zookeeper/bin下使用./zkServer.sh start启动服务，（停止者使用./zkServer.sh stop）

• （6）启动服务和可以使用telnet命令进行测试启动是否成功，例如:telnet 192.168.153.129 2181， 然后输入stat回车，如果出现：

  root@liumeng-1:/opt/zookeeper/bin# telnet 192.168.153.129 2181Trying 192.168.153.129...Connected to 192.168.153.129.Escape character is '^]'.statThis ZooKeeper instance is not currently serving requestsConnection closed by foreign host.

  表示当期集群服务对外提供服务，因为在zookeeper只有在超过集群内服务器数量+1的服务器上的zookeeper服务已经启动时才可以对外提供服务。比如上述配置中配了3台机器，那么则至少需要有两台服务器已经启动之后才能对外提供服务。

  root@liumeng-1:/opt/zookeeper/bin# telnet 192.168.153.132 2181Trying 192.168.153.132...Connected to 192.168.153.132.Escape character is '^]'.statZookeeper version: 3.4.10-39d3a4f269333c922ed3db283be479f9deacaa0f, built on 03/23/2017 10:13 GMTClients: /192.168.153.129:56480[0](queued=0,recved=1,sent=0)Latency min/avg/max: 0/0/0Received: 2Sent: 1Connections: 1Outstanding: 0Zxid: 0x100000000Mode: leaderNode count: 4Connection closed by foreign host.

  出现以上信息则表示服务启动成功，其中从Mode中可以看出，192.168.153.132为leader