#tar -zxvf /opt/zookeeper-3.4.5.tar.gz -C /usr/local

#mkdir /data/zookeeper-3.4.5
#chmod -R 777 /data/zookeeper-3.4.5
#echo "1">/data/zookeeper-3.4.5/myid
#cat /data/zookeeper-3.4.5/myid

显示1

#cd /usr/local/zookeeper-3.4.5/

#cd /usr/local/zookeeper-3.4.5/conf/

cp zoo_sample.cfg zoo.cfg
vi 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.
dataDir=/data/zookeeper-3.4.5
# the port at which the clients will connect
clientPort=2181
#
# 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.1=192.168.1.250:2888:3888
server.2=192.168.1.251:2888:3888
server.3=192.168.1.252:2888:3888

initLimit
ZooKeeper集群模式下包含多个zk进程，其中一个进程为leader，余下的进程为follower。
当follower最初与leader建立连接时，它们之间会传输相当多的数据，尤其是follower的数据落后leader很多。initLimit配置follower与leader之间建立连接后进行同步的最长时间。

syncLimit
配置follower和leader之间发送消息，请求和应答的最大时间长度。

tickTime
tickTime则是上述两个超时配置的基本单位，例如对于initLimit，其配置值为5，说明其超时时间为 2000ms * 5 = 10秒。

server.id=host:port1:port2
其中id为一个数字，表示zk进程的id，这个id也是dataDir目录下myid文件的内容。
host是该zk进程所在的IP地址，port1表示follower和leader交换消息所使用的端口，port2表示选举leader所使用的端口。
dataDir
其配置的含义跟单机模式下的含义类似，不同的是集群模式下还有一个myid文件。myid文件的内容只有一行，且内容只能为1 - 255之间的数字，这个数字亦即上面介绍server.id中的id，表示zk进程的id。

#scp -r /usr/local/zookeeper-3.4.5/ root@node2.jacky.com:/usr/local
#scp -r /usr/local/zookeeper-3.4.5/ root@node3.jacky.com:/usr/local
#scp -r /data/zookeeper-3.4.5/ root@node2.jacky.com:/data
#scp -r /data/zookeeper-3.4.5/ root@node3.jacky.com:/data

然后ssh进入node2.jacky.com的主机，把/data/zookeeper-3.4.5/myid里面的内容改为2

进入node3.jacky.com的主机，把/data/zookeeper-3.4.5/myid里面的内容改为3

设置开机启动

#cd /etc/init.d

#vi zookeeper

#chmod a+x zookeeper 

#chkconfig --add zookeeper

#scp -r /etc/init.d/zookeeper root@node2.jacky.com:/etc/init.d
# scp -r /etc/init.d/zookeeper root@node3.jacky.com:/etc/init.d

分别到 node2.jacky.com和node3.jacky.com的机器上执行：#chkconfig --add zookeeper

在3台机器上分别执行：#service zookeeper start

查看zookeeper启动进程的信息

# ps -ef|grep zookeeper

使用以下命令测试连接到一个zookeeper集群：

#/usr/local/zookeeper-3.4.5/bin/zkCli.sh -server 192.168.1.250:2181,192.168.1.251:2181,192.168.1.252:2181

输出以下信息：

Connecting to 192.168.1.250:2181,192.168.1.251:2181,192.168.1.252:2181
2021-10-12 01:39:25,242 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.5-1392090, built on 09/30/2012 17:52 GMT
2021-10-12 01:39:25,245 [myid:] - INFO  [main:Environment@100] - Client environment:host.name=node1.jacky.com
2021-10-12 01:39:25,245 [myid:] - INFO  [main:Environment@100] - Client environment:java.version=1.8.0_171
2021-10-12 01:39:25,245 [myid:] - INFO  [main:Environment@100] - Client environment:java.vendor=Oracle Corporation
2021-10-12 01:39:25,245 [myid:] - INFO  [main:Environment@100] - Client environment:java.home=/usr/local/java/jdk1.8.0_171/jre
2021-10-12 01:39:25,246 [myid:] - INFO  [main:Environment@100] - Client environment:java.class.path=/usr/local/zookeeper-3.4.5/bin/../build/classes:/usr/local/zookeeper-3.4.5/bin/../build/lib/*.jar:/usr/local/zookeeper-3.4.5/bin/../lib/slf4j-log4j12-1.6.1.jar:/usr/local/zookeeper-3.4.5/bin/../lib/slf4j-api-1.6.1.jar:/usr/local/zookeeper-3.4.5/bin/../lib/netty-3.2.2.Final.jar:/usr/local/zookeeper-3.4.5/bin/../lib/log4j-1.2.15.jar:/usr/local/zookeeper-3.4.5/bin/../lib/jline-0.9.94.jar:/usr/local/zookeeper-3.4.5/bin/../zookeeper-3.4.5.jar:/usr/local/zookeeper-3.4.5/bin/../src/java/lib/*.jar:/usr/local/zookeeper-3.4.5/bin/../conf:.:/usr/local/java/jdk1.8.0_171/lib:/usr/local/java/jdk1.8.0_171/jre/lib
2021-10-12 01:39:25,246 [myid:] - INFO  [main:Environment@100] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2021-10-12 01:39:25,246 [myid:] - INFO  [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2021-10-12 01:39:25,246 [myid:] - INFO  [main:Environment@100] - Client environment:java.compiler=<NA>
2021-10-12 01:39:25,246 [myid:] - INFO  [main:Environment@100] - Client environment:os.name=Linux
2021-10-12 01:39:25,247 [myid:] - INFO  [main:Environment@100] - Client environment:os.arch=amd64
2021-10-12 01:39:25,247 [myid:] - INFO  [main:Environment@100] - Client environment:os.version=3.10.0-1062.el7.x86_64
2021-10-12 01:39:25,247 [myid:] - INFO  [main:Environment@100] - Client environment:user.name=root
2021-10-12 01:39:25,247 [myid:] - INFO  [main:Environment@100] - Client environment:user.home=/root
2021-10-12 01:39:25,247 [myid:] - INFO  [main:Environment@100] - Client environment:user.dir=/etc/rc.d/init.d
2021-10-12 01:39:25,248 [myid:] - INFO  [main:ZooKeeper@438] - Initiating client connection, connectString=192.168.1.250:2181,192.168.1.251:2181,192.168.1.252:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@7aec35a
2021-10-12 01:39:25,312 [myid:] - INFO  [main-SendThread(node3.jacky.com:2181):ClientCnxn$SendThread@966] - Opening socket connection to server node3.jacky.com/192.168.1.252:2181. Will not attempt to authenticate using SASL (unknown error)
Welcome to ZooKeeper!
JLine support is enabled
2021-10-12 01:39:25,462 [myid:] - INFO  [main-SendThread(node3.jacky.com:2181):ClientCnxn$SendThread@849] - Socket connection established to node3.jacky.com/192.168.1.252:2181, initiating session
[zk: 192.168.1.250:2181,192.168.1.251:2181,192.168.1.252:2181(CONNECTING) 0] 2021-10-12 01:39:25,553 [myid:] - INFO  [main-SendThread(node3.jacky.com:2181):ClientCnxn$SendThread@1207] - Session establishment complete on server node3.jacky.com/192.168.1.252:2181, sessionid = 0x37c706be1d20000, negotiated timeout = 30000

WATCHER::

WatchedEvent state:SyncConnected type:None path:null

[zk: 192.168.1.250:2181,192.168.1.251:2181,192.168.1.252:2181(CONNECTED) 0]

　　说明zookeeper集群配置成功了