目录
1.前提
2.配置主机名到IP地址的映射
3.修改zoo.cfg配置
4.新建myid文件并写入集群标识
5.在另外两台机器进行相同操作
6.查看集群状态配置结束
接着上一篇博客linux下zookeeper单机搭建，本篇进阶一下，利用三台机器进行集群操作。保证高可用。
1.前提
作者默认读者已经准备好了三台不同ip的机器或者虚拟机，并且都已经安装好jdk，linux 下zookeeper安装教程可以参考我的另一篇博客。
以下是zookeeper真集群配置教程
我们准备的三台机器ip分别为
xx.xx.xx.1
xx.xx.xx.2
xx.xx.xx.32.配置主机名到IP地址的映射
(此步骤不是必须的,我们可以直接在zk的配置文件中填写IP地址)，这样配置的好处是如果某个IP地址发生了变化，我们不需要重启zookeeper，直接修改主机对应的IP地址即可。
直接修改/etc/hosts文件，设置主机zoo-1映射到x.x.x.1，设置主机zoo-2映射到x.x.x.2，设置主机zoo-3映射到x.x.x.3
三台机器都需要相同的hosts配置
vim /etc/hostsx.x.x.1 zoo-1
x.x.x.2 zoo-2
x.x.x.3 zoo-3
3.修改zoo.cfg配置
vi zoo.cfg以下是需要在zoo.cfg中增加的配置
server.1=zoo-1:2888:3888
server.2=zoo-2:2888:3888
server.3=zoo-3:2888:3888配置完成效果
4.新建myid文件并写入集群标识
在dataDir目录中，创建一个名为myid的文件，并写入机器对应的数字值，比如我们是在zoo-1的机器上，就将该值设置为1，即集群中sever.1=zoo-1:2888:3888中server.后对应的数字。这是zookeeper用来识别是那一台集群机器的标识。
echo "1" > /usr/local/zookeeper-3.5.4-beta/myid这里一台机器的集群配置完成了，接下来我们在另外两台机器上进行相同的操作，安装分别zk，配置一摸一样就行，唯一一个地方需要修改的就是myid的文件。
注：此处唯一不同的地方是每个dataDir下的myid中的内容要按照zoo.cfg配置文件中的集群信息设置。比如：x.x.x.2对应集群中的server.2，所以在myid中写入2
5.在另外两台机器进行相同操作
所以在其他两台机器安装时，直接scp命令复制过去就行，只需要改这个myid文件。
到此为止我们三台机器都配置了集群信息。
6.查看集群状态配置结束
我们分别启动机器1，机器2，机器3.集群会自动选举出一台服务器作为leader，其余服务器为follower，可以在每台服务器上使用命令查看服务器是什么类型的。
zkServer.sh status
可以通过客户端，连接到ZooKeeper集群上。对于客户端来说，ZooKeeper是一个整体（ensemble），你可以在任何一个结点上建立到服务集群的连接，例如：
[root@web-login-134 bin]# zkCli.sh -server x.x.x.1:2181
Connecting to 10.137.35.134:2181
2018-08-21 15:30:29,656 [myid:] - INFO [main:Environment@109] - Client environm ent:zookeeper.version=3.5.4-beta-7f51e5b68cf2f80176ff944a9ebd2abbc65e7327, built on 05/11/2018 16:27 GMT
2018-08-21 15:30:29,659 [myid:] - INFO [main:Environment@109] - Client environm ent:host.name=localhost
2018-08-21 15:30:29,660 [myid:] - INFO [main:Environment@109] - Client environm ent:java.version=1.8.0_181
2018-08-21 15:30:29,662 [myid:] - INFO [main:Environment@109] - Client environm ent:java.vendor=Oracle Corporation
2018-08-21 15:30:29,663 [myid:] - INFO [main:Environment@109] - Client environm ent:java.home=/usr/java/jdk1.8.0_181/jre
2018-08-21 15:30:29,663 [myid:] - INFO [main:Environment@109] - Client environm ent:java.class.path=/usr/local/zookeeper-3.5.4-beta/bin/../build/classes:/usr/lo cal/zookeeper-3.5.4-beta/bin/../build/lib/*.jar:/usr/local/zookeeper-3.5.4-beta/ bin/../lib/slf4j-log4j12-1.7.25.jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/s lf4j-api-1.7.25.jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/netty-3.10.6.Fina l.jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/log4j-1.2.17.jar:/usr/local/zoo keeper-3.5.4-beta/bin/../lib/jline-2.11.jar:/usr/local/zookeeper-3.5.4-beta/bin/ ../lib/jetty-util-9.2.18.v20160721.jar:/usr/local/zookeeper-3.5.4-beta/bin/../li b/jetty-servlet-9.2.18.v20160721.jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/ jetty-server-9.2.18.v20160721.jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/jet ty-security-9.2.18.v20160721.jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/jett y-io-9.2.18.v20160721.jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/jetty-http- 9.2.18.v20160721.jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/javax.servlet-ap i-3.1.0.jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/jackson-mapper-asl-1.9.11 .jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/jackson-core-asl-1.9.11.jar:/usr /local/zookeeper-3.5.4-beta/bin/../lib/commons-cli-1.2.jar:/usr/local/zookeeper- 3.5.4-beta/bin/../lib/audience-annotations-0.5.0.jar:/usr/local/zookeeper-3.5.4- beta/bin/../zookeeper-3.5.4-beta.jar:/usr/local/zookeeper-3.5.4-beta/bin/../src/ java/lib/*.jar:/usr/local/zookeeper-3.5.4-beta/bin/../conf:.:/usr/java/jdk1.8.0_ 181/lib:/usr/java/jdk1.8.0_181/jre/lib:
2018-08-21 15:30:29,663 [myid:] - INFO [main:Environment@109] - Client environm ent:java.library.path=:/usr/local/lib:/usr/java/packages/lib/amd64:/usr/lib64:/l ib64:/lib:/usr/lib
2018-08-21 15:30:29,663 [myid:] - INFO [main:Environment@109] - Client environm ent:java.io.tmpdir=/tmp
2018-08-21 15:30:29,663 [myid:] - INFO [main:Environment@109] - Client environm ent:java.compiler=<NA>
2018-08-21 15:30:29,663 [myid:] - INFO [main:Environment@109] - Client environm ent:os.name=Linux
2018-08-21 15:30:29,663 [myid:] - INFO [main:Environment@109] - Client environm ent:os.arch=amd64
2018-08-21 15:30:29,664 [myid:] - INFO [main:Environment@109] - Client environm ent:os.version=2.6.32-431.el6.x86_64
2018-08-21 15:30:29,664 [myid:] - INFO [main:Environment@109] - Client environm ent:user.name=root
2018-08-21 15:30:29,664 [myid:] - INFO [main:Environment@109] - Client environm ent:user.home=/root
2018-08-21 15:30:29,664 [myid:] - INFO [main:Environment@109] - Client environm ent:user.dir=/usr/local/zookeeper-3.5.4-beta/bin
2018-08-21 15:30:29,664 [myid:] - INFO [main:Environment@109] - Client environm ent:os.memory.free=113MB
2018-08-21 15:30:29,666 [myid:] - INFO [main:Environment@109] - Client environm ent:os.memory.max=228MB
2018-08-21 15:30:29,666 [myid:] - INFO [main:Environment@109] - Client environm ent:os.memory.total=119MB
2018-08-21 15:30:29,671 [myid:] - INFO [main:ZooKeeper@868] - Initiating client connection, connectString=-------:2181 sessionTimeout=30000 watcher=org.a pache.zookeeper.ZooKeeperMain$MyWatcher@64a294a6
2018-08-21 15:30:29,712 [myid:] - INFO [main:ClientCnxnSocket@236] - jute.maxbu ffer value is 4194304 Bytes
Welcome to ZooKeeper!
2018-08-21 15:30:29,736 [myid:1---------:2181] - INFO [main-SendThread(10.13 7.35.134:2181):ClientCnxn$SendThread@1106] - Opening socket connection to server 10.137.35.134/10.137.35.134:2181. Will not attempt to authenticate using SASL ( unknown error)
JLine support is enabled
2018-08-21 15:30:29,866 [myid:10.137.35.134:2181] - INFO [main-SendThread(------------:2181):ClientCnxn$SendThread@947] - Socket connection established, initi ating session, client: /----------:56782, server: ----------/----------- :2181
[zk: -----------:2181(CONNECTING) 0] 2018-08-21 15:30:29,917 [myid:10.137.35.1 34:2181] - INFO [main-SendThread(10.137.35.134:2181):ClientCnxn$SendThread@1381 ] - Session establishment complete on server 10.137.35.134/10.137.35.134:2181, s essionid = 0x3083dea7eed0000, negotiated timeout = 30000
WATCHER::
WatchedEvent state:SyncConnected type:None path:null
[root@web-login-134 bin]# zkCli.sh -server x.x.x.2:2181
Connecting to 10.137.35.132:2181
2018-08-21 15:30:39,515 [myid:] - INFO [main:Environment@109] - Client environm ent:zookeeper.version=3.5.4-beta-7f51e5b68cf2f80176ff944a9ebd2abbc65e7327, built on 05/11/2018 16:27 GMT
2018-08-21 15:30:39,521 [myid:] - INFO [main:Environment@109] - Client environm ent:host.name=localhost
2018-08-21 15:30:39,521 [myid:] - INFO [main:Environment@109] - Client environm ent:java.version=1.8.0_181
2018-08-21 15:30:39,525 [myid:] - INFO [main:Environment@109] - Client environm ent:java.vendor=Oracle Corporation
2018-08-21 15:30:39,526 [myid:] - INFO [main:Environment@109] - Client environm ent:java.home=/usr/java/jdk1.8.0_181/jre
2018-08-21 15:30:39,526 [myid:] - INFO [main:Environment@109] - Client environm ent:java.class.path=/usr/local/zookeeper-3.5.4-beta/bin/../build/classes:/usr/lo cal/zookeeper-3.5.4-beta/bin/../build/lib/*.jar:/usr/local/zookeeper-3.5.4-beta/ bin/../lib/slf4j-log4j12-1.7.25.jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/s lf4j-api-1.7.25.jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/netty-3.10.6.Fina l.jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/log4j-1.2.17.jar:/usr/local/zoo keeper-3.5.4-beta/bin/../lib/jline-2.11.jar:/usr/local/zookeeper-3.5.4-beta/bin/ ../lib/jetty-util-9.2.18.v20160721.jar:/usr/local/zookeeper-3.5.4-beta/bin/../li b/jetty-servlet-9.2.18.v20160721.jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/ jetty-server-9.2.18.v20160721.jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/jet ty-security-9.2.18.v20160721.jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/jett y-io-9.2.18.v20160721.jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/jetty-http- 9.2.18.v20160721.jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/javax.servlet-ap i-3.1.0.jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/jackson-mapper-asl-1.9.11 .jar:/usr/local/zookeeper-3.5.4-beta/bin/../lib/jackson-core-asl-1.9.11.jar:/usr /local/zookeeper-3.5.4-beta/bin/../lib/commons-cli-1.2.jar:/usr/local/zookeeper- 3.5.4-beta/bin/../lib/audience-annotations-0.5.0.jar:/usr/local/zookeeper-3.5.4- beta/bin/../zookeeper-3.5.4-beta.jar:/usr/local/zookeeper-3.5.4-beta/bin/../src/ java/lib/*.jar:/usr/local/zookeeper-3.5.4-beta/bin/../conf:.:/usr/java/jdk1.8.0_ 181/lib:/usr/java/jdk1.8.0_181/jre/lib:
2018-08-21 15:30:39,526 [myid:] - INFO [main:Environment@109] - Client environm ent:java.library.path=:/usr/local/lib:/usr/java/packages/lib/amd64:/usr/lib64:/l ib64:/lib:/usr/lib
2018-08-21 15:30:39,526 [myid:] - INFO [main:Environment@109] - Client environm ent:java.io.tmpdir=/tmp
2018-08-21 15:30:39,527 [myid:] - INFO [main:Environment@109] - Client environm ent:java.compiler=<NA>
2018-08-21 15:30:39,527 [myid:] - INFO [main:Environment@109] - Client environm ent:os.name=Linux
2018-08-21 15:30:39,527 [myid:] - INFO [main:Environment@109] - Client environm ent:os.arch=amd64
2018-08-21 15:30:39,527 [myid:] - INFO [main:Environment@109] - Client environm ent:os.version=2.6.32-431.el6.x86_64
2018-08-21 15:30:39,527 [myid:] - INFO [main:Environment@109] - Client environm ent:user.name=root
2018-08-21 15:30:39,527 [myid:] - INFO [main:Environment@109] - Client environm ent:user.home=/root
2018-08-21 15:30:39,528 [myid:] - INFO [main:Environment@109] - Client environm ent:user.dir=/usr/local/zookeeper-3.5.4-beta/bin
2018-08-21 15:30:39,528 [myid:] - INFO [main:Environment@109] - Client environm ent:os.memory.free=113MB
2018-08-21 15:30:39,531 [myid:] - INFO [main:Environment@109] - Client environm ent:os.memory.max=228MB
2018-08-21 15:30:39,531 [myid:] - INFO [main:Environment@109] - Client environm ent:os.memory.total=119MB
2018-08-21 15:30:39,536 [myid:] - INFO [main:ZooKeeper@868] - Initiating client connection, connectString=10.137.35.132:2181 sessionTimeout=30000 watcher=org.a pache.zookeeper.ZooKeeperMain$MyWatcher@64a294a6
2018-08-21 15:30:39,555 [myid:] - INFO [main:ClientCnxnSocket@236] - jute.maxbu ffer value is 4194304 Bytes
Welcome to ZooKeeper!
2018-08-21 15:30:39,577 [myid:10.137.35.132:2181] - INFO [main-SendThread(10.13 7.35.132:2181):ClientCnxn$SendThread@1106] - Opening socket connection to server 10.137.35.132/10.137.35.132:2181. Will not attempt to authenticate using SASL ( unknown error)
JLine support is enabled
2018-08-21 15:30:39,739 [myid:10.137.35.132:2181] - INFO [main-SendThread(10.13 7.35.132:2181):ClientCnxn$SendThread@947] - Socket connection established, initi ating session, client: /10.137.35.134:34479, server: 10.137.35.132/10.137.35.132 :2181
2018-08-21 15:30:39,758 [myid:10.137.35.132:2181] - INFO [main-SendThread(10.13 7.35.132:2181):ClientCnxn$SendThread@1381] - Session establishment complete on s erver 10.137.35.132/10.137.35.132:2181, sessionid = 0x103486345220000, negotiate d timeout = 30000
WATCHER::
WatchedEvent state:SyncConnected type:None path:null
[zk: 10.137.35.132:2181(CONNECTED) 0]
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