配置ZooKeeper集群
以3节点的集群为例：192.168.1.220、192.168.1.221、192.168.1.222。因为前面配置单机ZooKeeper和伪集群ZooKeeper已经解释过所有步骤和配置项的意义，所以这里就直接给步骤。
假设已经在3个节点上都安装好了jdk(这是前提)，并下载好了ZooKeeper。
[root@master ~]# tar xf zookeeper-3.4.7.tar.gz [root@master ~]# mv zookeeper-3.4.7 /usr/local/zookeeper # 3个节点都执行
添加ZooKeeper环境变量，非必须过程，但建议。
[root@master ~]# echo 'ZOOKEEPER_HOME=/usr/local/zookeeper' >/etc/profile.d/zk.sh [root@master ~]# echo 'PATH=$ZOOKEEPER_HOME/bin:$PATH' >> /etc/profile.d/zk.sh [root@master ~]# chmod +x /etc/profile.d/zk.sh [root@master ~]# source /etc/profile.d/zk.sh # 在3节点上都执行
提供配置文件。以下是3个节点上的配置文件：
[root@master ~]# vi /usr/local/zookeeper/conf/zoo.cfg tickTime=2000 dataDir=/usr/local/zookeeper/data clientPort=2181 initLimit=5 syncLimit=2 server.1=192.168.1.220:2888:3888 server.2=192.168.1.221:2888:3888 server.3=192.168.1.222:2888:3888
在三个节点上都创建好数据目录，并写入myid文件。
[root@master ~]# mkdir /usr/local/zookeeper/data # 3个节点上都执行：
[root@master ~]# echo 1 >/usr/local/zookeeper/data/myid #192.168.1.220上执行
[root@node02 ~]# echo 2 >/usr/local/zookeeper/data/myid #192.168.1.222上执行
[root@node01 ~]# echo 3 >/usr/local/zookeeper/data/myid #192.168.1.221上执行
启动这3个ZooKeeper实例。
[root@master ~]# zkServer.sh start # 3个节点都执行：
然后在3个节点上都验证一下是否正确启动ZooKeeper。
# 节点1上执行： [root@master ~]# zkServer.sh status ZooKeeper JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Mode: follower # 节点2上执行： [root@node01 ~]# zkServer.sh status ZooKeeper JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Mode: leader # 节点3上执行： [root@node02 ~]# zkServer.sh status ZooKeeper JMX enabled by default Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg Mode: follower
如果某个服务器实例出现了错误，请zkServer.sh stop关闭ZooKeeper实例，然后jps命令查看下是否还有ZooKeeper实例在运行，如果有，kill掉。然后再启动ZooKeeper。另外，建议在第一次启动ZooKeeper之前，先将dataDir/version-2目录删除(如果已存在，因为可能是以前的实例因为各种原因而留下来的)。
最后测试下，某节点上创建一个znode，其它节点是否也同步了该节点。
# 在192.168.1.220上创建一个znode： [root@master ~]# zkCli.sh -server 192.168.1.220:2181 create /test_znode "hello world" Connecting to 192.168.1.220:2181 2020-03-05 21:10:59,181 [myid:] - INFO [main:Environment@100] - Client environment:zookeeper.version=3.4.7-1713338, built on 11/09/2015 04:32 GMT 2020-03-05 21:10:59,195 [myid:] - INFO [main:Environment@100] - Client environment:host.name=master 2020-03-05 21:10:59,195 [myid:] - INFO [main:Environment@100] - Client environment:java.version=1.8.0_191 2020-03-05 21:10:59,204 [myid:] - INFO [main:Environment@100] - Client environment:java.vendor=Oracle Corporation 2020-03-05 21:10:59,205 [myid:] - INFO [main:Environment@100] - Client environment:java.home=/usr/local/jdk1.8.0_191/jre 2020-03-05 21:10:59,206 [myid:] - INFO [main:Environment@100] - Client environment:java.class.path=/usr/local/zookeeper/bin/../build/classes:/usr/local/zookeeper/bin/../build/lib/*.jar:/usr/local/zookeeper/bin/../lib/slf4j-log4j12-1.6.1.jar:/usr/local/zookeeper/bin/../lib/slf4j-api-1.6.1.jar:/usr/local/zookeeper/bin/../lib/netty-3.7.0.Final.jar:/usr/local/zookeeper/bin/../lib/log4j-1.2.16.jar:/usr/local/zookeeper/bin/../lib/jline-0.9.94.jar:/usr/local/zookeeper/bin/../zookeeper-3.4.7.jar:/usr/local/zookeeper/bin/../src/java/lib/*.jar:/usr/local/zookeeper/bin/../conf: 2020-03-05 21:10:59,208 [myid:] - INFO [main:Environment@100] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib 2020-03-05 21:10:59,210 [myid:] - INFO [main:Environment@100] - Client environment:java.io.tmpdir=/tmp 2020-03-05 21:10:59,211 [myid:] - INFO [main:Environment@100] - Client environment:java.compiler=<NA> 2020-03-05 21:10:59,211 [myid:] - INFO [main:Environment@100] - Client environment:os.name=Linux 2020-03-05 21:10:59,212 [myid:] - INFO [main:Environment@100] - Client environment:os.arch=amd64 2020-03-05 21:10:59,213 [myid:] - INFO [main:Environment@100] - Client environment:os.version=3.10.0-693.el7.x86_64 2020-03-05 21:10:59,213 [myid:] - INFO [main:Environment@100] - Client environment:user.name=root 2020-03-05 21:10:59,213 [myid:] - INFO [main:Environment@100] - Client environment:user.home=/root 2020-03-05 21:10:59,213 [myid:] - INFO [main:Environment@100] - Client environment:user.dir=/root 2020-03-05 21:10:59,216 [myid:] - INFO [main:ZooKeeper@438] - Initiating client connection, connectString=192.168.1.220:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@1a86f2f1 2020-03-05 21:10:59,271 [myid:] - INFO [main-SendThread(192.168.1.220:2181):ClientCnxn$SendThread@1032] - Opening socket connection to server 192.168.1.220/192.168.1.220:2181. Will not attempt to authenticate using SASL (unknown error) 2020-03-05 21:10:59,346 [myid:] - INFO [main-SendThread(192.168.1.220:2181):ClientCnxn$SendThread@876] - Socket connection established to 192.168.1.220/192.168.1.220:2181, initiating session 2020-03-05 21:10:59,378 [myid:] - INFO [main-SendThread(192.168.1.220:2181):ClientCnxn$SendThread@1299] - Session establishment complete on server 192.168.1.220/192.168.1.220:2181, sessionid = 0x170aaceef8c0000, negotiated timeout = 30000 WATCHER:: WatchedEvent state:SyncConnected type:None path:null Created /test_znode
# 在192.168.1.221上获取这个znode [root@node01 ~]# zkCli.sh -server 192.168.1.221:2181 get /test_znode Connecting to 192.168.1.221:2181 2020-03-05 21:12:22,652 [myid:] - INFO [main:Environment@100] - Client environment:zookeeper.version=3.4.7-1713338, built on 11/09/2015 04:32 GMT 2020-03-05 21:12:22,655 [myid:] - INFO [main:Environment@100] - Client environment:host.name=node01 2020-03-05 21:12:22,655 [myid:] - INFO [main:Environment@100] - Client environment:java.version=1.8.0_191 2020-03-05 21:12:22,657 [myid:] - INFO [main:Environment@100] - Client environment:java.vendor=Oracle Corporation 2020-03-05 21:12:22,657 [myid:] - INFO [main:Environment@100] - Client environment:java.home=/usr/local/jdk1.8.0_191/jre 2020-03-05 21:12:22,657 [myid:] - INFO [main:Environment@100] - Client environment:java.class.path=/usr/local/zookeeper/bin/../build/classes:/usr/local/zookeeper/bin/../build/lib/*.jar:/usr/local/zookeeper/bin/../lib/slf4j-log4j12-1.6.1.jar:/usr/local/zookeeper/bin/../lib/slf4j-api-1.6.1.jar:/usr/local/zookeeper/bin/../lib/netty-3.7.0.Final.jar:/usr/local/zookeeper/bin/../lib/log4j-1.2.16.jar:/usr/local/zookeeper/bin/../lib/jline-0.9.94.jar:/usr/local/zookeeper/bin/../zookeeper-3.4.7.jar:/usr/local/zookeeper/bin/../src/java/lib/*.jar:/usr/local/zookeeper/bin/../conf: 2020-03-05 21:12:22,657 [myid:] - INFO [main:Environment@100] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib 2020-03-05 21:12:22,657 [myid:] - INFO [main:Environment@100] - Client environment:java.io.tmpdir=/tmp 2020-03-05 21:12:22,657 [myid:] - INFO [main:Environment@100] - Client environment:java.compiler=<NA> 2020-03-05 21:12:22,657 [myid:] - INFO [main:Environment@100] - Client environment:os.name=Linux 2020-03-05 21:12:22,657 [myid:] - INFO [main:Environment@100] - Client environment:os.arch=amd64 2020-03-05 21:12:22,657 [myid:] - INFO [main:Environment@100] - Client environment:os.version=3.10.0-693.el7.x86_64 2020-03-05 21:12:22,657 [myid:] - INFO [main:Environment@100] - Client environment:user.name=root 2020-03-05 21:12:22,657 [myid:] - INFO [main:Environment@100] - Client environment:user.home=/root 2020-03-05 21:12:22,658 [myid:] - INFO [main:Environment@100] - Client environment:user.dir=/root 2020-03-05 21:12:22,658 [myid:] - INFO [main:ZooKeeper@438] - Initiating client connection, connectString=192.168.1.221:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@1a86f2f1 2020-03-05 21:12:22,695 [myid:] - INFO [main-SendThread(192.168.1.221:2181):ClientCnxn$SendThread@1032] - Opening socket connection to server 192.168.1.221/192.168.1.221:2181. Will not attempt to authenticate using SASL (unknown error) 2020-03-05 21:12:22,814 [myid:] - INFO [main-SendThread(192.168.1.221:2181):ClientCnxn$SendThread@876] - Socket connection established to 192.168.1.221/192.168.1.221:2181, initiating session 2020-03-05 21:12:22,826 [myid:] - INFO [main-SendThread(192.168.1.221:2181):ClientCnxn$SendThread@1299] - Session establishment complete on server 192.168.1.221/192.168.1.221:2181, sessionid = 0x270aacedac50001, negotiated timeout = 30000 WATCHER:: WatchedEvent state:SyncConnected type:None path:null hello world cZxid = 0x100000002 ctime = Thu Mar 05 21:10:54 CST 2020 mZxid = 0x100000002 mtime = Thu Mar 05 21:10:54 CST 2020 pZxid = 0x100000002 cversion = 0 dataVersion = 0 aclVersion = 0 ephemeralOwner = 0x0 dataLength = 11 numChildren = 0
# 在192.168.1.222上获取这个znode [root@node02 data]# zkCli.sh -server 192.168.1.222:2181 ls / Connecting to 192.168.1.222:2181 2020-03-05 21:13:46,206 [myid:] - INFO [main:Environment@100] - Client environment:zookeeper.version=3.4.7-1713338, built on 11/09/2015 04:32 GMT 2020-03-05 21:13:46,222 [myid:] - INFO [main:Environment@100] - Client environment:host.name=node02 2020-03-05 21:13:46,222 [myid:] - INFO [main:Environment@100] - Client environment:java.version=1.8.0_191 2020-03-05 21:13:46,236 [myid:] - INFO [main:Environment@100] - Client environment:java.vendor=Oracle Corporation 2020-03-05 21:13:46,236 [myid:] - INFO [main:Environment@100] - Client environment:java.home=/usr/local/jdk1.8.0_191/jre 2020-03-05 21:13:46,237 [myid:] - INFO [main:Environment@100] - Client environment:java.class.path=/usr/local/zookeeper/bin/../build/classes:/usr/local/zookeeper/bin/../build/lib/*.jar:/usr/local/zookeeper/bin/../lib/slf4j-log4j12-1.6.1.jar:/usr/local/zookeeper/bin/../lib/slf4j-api-1.6.1.jar:/usr/local/zookeeper/bin/../lib/netty-3.7.0.Final.jar:/usr/local/zookeeper/bin/../lib/log4j-1.2.16.jar:/usr/local/zookeeper/bin/../lib/jline-0.9.94.jar:/usr/local/zookeeper/bin/../zookeeper-3.4.7.jar:/usr/local/zookeeper/bin/../src/java/lib/*.jar:/usr/local/zookeeper/bin/../conf: 2020-03-05 21:13:46,237 [myid:] - INFO [main:Environment@100] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib 2020-03-05 21:13:46,237 [myid:] - INFO [main:Environment@100] - Client environment:java.io.tmpdir=/tmp 2020-03-05 21:13:46,237 [myid:] - INFO [main:Environment@100] - Client environment:java.compiler=<NA> 2020-03-05 21:13:46,238 [myid:] - INFO [main:Environment@100] - Client environment:os.name=Linux 2020-03-05 21:13:46,238 [myid:] - INFO [main:Environment@100] - Client environment:os.arch=amd64 2020-03-05 21:13:46,238 [myid:] - INFO [main:Environment@100] - Client environment:os.version=3.10.0-693.el7.x86_64 2020-03-05 21:13:46,239 [myid:] - INFO [main:Environment@100] - Client environment:user.name=root 2020-03-05 21:13:46,239 [myid:] - INFO [main:Environment@100] - Client environment:user.home=/root 2020-03-05 21:13:46,239 [myid:] - INFO [main:Environment@100] - Client environment:user.dir=/usr/local/zookeeper/data 2020-03-05 21:13:46,244 [myid:] - INFO [main:ZooKeeper@438] - Initiating client connection, connectString=192.168.1.222:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@1a86f2f1 2020-03-05 21:13:46,294 [myid:] - INFO [main-SendThread(192.168.1.222:2181):ClientCnxn$SendThread@1032] - Opening socket connection to server 192.168.1.222/192.168.1.222:2181. Will not attempt to authenticate using SASL (unknown error) 2020-03-05 21:13:46,414 [myid:] - INFO [main-SendThread(192.168.1.222:2181):ClientCnxn$SendThread@876] - Socket connection established to 192.168.1.222/192.168.1.222:2181, initiating session 2020-03-05 21:13:46,432 [myid:] - INFO [main-SendThread(192.168.1.222:2181):ClientCnxn$SendThread@1299] - Session establishment complete on server 192.168.1.222/192.168.1.222:2181, sessionid = 0x370aacef0570000, negotiated timeout = 30000 WATCHER:: WatchedEvent state:SyncConnected type:None path:null [zookeeper, test_znode]
