Zookeeper客户端不能启动问题

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在尝试使用zookeeper客户端zkCli.sh连接到SLAVE:2181时遇到连接失败的问题，通过检查zoo.cfg配置文件发现clientPort设置错误，原本设置为4081，应更改为2181。修复配置后，客户端成功连接到localhost:2181。

1，安装完zookeeper后运行客户端：

root@MASTER opt]# zkCli.sh -server SLAVE:2181
Connecting to SLAVE:2181
2016-11-10 11:15:10,274 [myid:] - INFO [main:Environment@100] - Client environment:zookeeper.version=3.4.9-1757313, built on 08/23/2016 06:50 GMT
2016-11-10 11:15:10,279 [myid:] - INFO [main:Environment@100] - Client environment:host.name=MASTER
2016-11-10 11:15:10,279 [myid:] - INFO [main:Environment@100] - Client environment:java.version=1.8.0_111
2016-11-10 11:15:10,282 [myid:] - INFO [main:Environment@100] - Client environment:java.vendor=Oracle Corporation
2016-11-10 11:15:10,282 [myid:] - INFO [main:Environment@100] - Client environment:java.home=/usr/java/jdk1.8.0_111/jre
2016-11-10 11:15:10,282 [myid:] - INFO [main:Environment@100] - Client environment:java.class.path=/root/cluster/opt/zookeeper-3.4.9/bin/../build/classes:/root/cluster/opt/zookeeper-3.4.9/bin/../build/lib/*.jar:/root/cluster/opt/zookeeper-3.4.9/bin/../lib/slf4j-log4j12-1.6.1.jar:/root/cluster/opt/zookeeper-3.4.9/bin/../lib/slf4j-api-1.6.1.jar:/root/cluster/opt/zookeeper-3.4.9/bin/../lib/netty-3.10.5.Final.jar:/root/cluster/opt/zookeeper-3.4.9/bin/../lib/log4j-1.2.16.jar:/root/cluster/opt/zookeeper-3.4.9/bin/../lib/jline-0.9.94.jar:/root/cluster/opt/zookeeper-3.4.9/bin/../zookeeper-3.4.9.jar:/root/cluster/opt/zookeeper-3.4.9/bin/../src/java/lib/*.jar:/root/cluster/opt/zookeeper-3.4.9/bin/../conf:/usr/java/jdk1.8.0_111/lib
2016-11-10 11:15:10,282 [myid:] - INFO [main:Environment@100] - Client environment:java.library.path=/opt/STM/ST40R5.1.0/lib:/usr/java/packages/lib/i386:/lib:/usr/lib
2016-11-10 11:15:10,282 [myid:] - INFO [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2016-11-10 11:15:10,282 [myid:] - INFO [main:Environment@100] - Client environment:java.compiler=<NA>
2016-11-10 11:15:10,282 [myid:] - INFO [main:Environment@100] - Client environment:os.name=Linux
2016-11-10 11:15:10,283 [myid:] - INFO [main:Environment@100] - Client environment:os.arch=i386
2016-11-10 11:15:10,283 [myid:] - INFO [main:Environment@100] - Client environment:os.version=3.11.10-301.fc20.i686+PAE
2016-11-10 11:15:10,283 [myid:] - INFO [main:Environment@100] - Client environment:user.name=root
2016-11-10 11:15:10,283 [myid:] - INFO [main:Environment@100] - Client environment:user.home=/root
2016-11-10 11:15:10,283 [myid:] - INFO [main:Environment@100] - Client environment:user.dir=/root/cluster/opt
2016-11-10 11:15:10,285 [myid:] - INFO [main:ZooKeeper@438] - Initiating client connection, connectString=SLAVE:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@6cdf90
Welcome to ZooKeeper!
2016-11-10 11:15:10,321 [myid:] - INFO [main-SendThread(SLAVE:2181):ClientCnxn$SendThread@1032] - Opening socket connection to server SLAVE/10.12.2.224:2181. Will not attempt to authenticate using SASL (unknown error)
JLine support is enabled
2016-11-10 11:15:10,403 [myid:] - INFO [main-SendThread(SLAVE:2181):ClientCnxn$SendThread@876] - Socket connection established to SLAVE/10.12.2.224:2181, initiating session
2016-11-10 11:15:10,412 [myid:] - INFO [main-SendThread(SLAVE:2181):ClientCnxn$SendThread@1158] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect
[zk: SLAVE:2181(CONNECTING) 0] 2016-11-10 11:15:12,234 [myid:] - INFO [main-SendThread(SLAVE:2181):ClientCnxn$SendThread@1032] - Opening socket connection to server SLAVE/10.12.2.224:2181. Will not attempt to authenticate using SASL (unknown error)
2016-11-10 11:15:12,236 [myid:] - INFO [main-SendThread(SLAVE:2181):ClientCnxn$SendThread@876] - Socket connection established to SLAVE/10.12.2.224:2181, initiating session
2016-11-10 11:15:12,239 [myid:] - INFO [main-SendThread(SLAVE:2181):ClientCnxn$SendThread@1158] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect
2016-11-10 11:15:13,969 [myid:] - INFO [main-SendThread(SLAVE:2181):ClientCnxn$SendThread@1032] - Opening socket connection to server SLAVE/10.12.2.224:2181. Will not attempt to authenticate using SASL (unknown error)
2016-11-10 11:15:13,971 [myid:] - INFO [main-SendThread(SLAVE:2181):ClientCnxn$SendThread@876] - Socket connection established to SLAVE/10.12.2.224:2181, initiating session
2016-11-10 11:15:13,974 [myid:] - INFO [main-SendThread(SLAVE:2181):ClientCnxn$SendThread@1158] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect
2016-11-10 11:15:15,758 [myid:] - INFO [main-SendThread(SLAVE:2181):ClientCnxn$SendThread@1032] - Opening socket connection to server SLAVE/10.12.2.224:2181. Will not attempt to authenticate using SASL (unknown error)
2016-11-10 11:15:15,760 [myid:] - INFO [main-SendThread(SLAVE:2181):ClientCnxn$SendThread@876] - Socket connection established to SLAVE/10.12.2.224:2181, initiating session
2016-11-10 11:15:15,762 [myid:] - INFO [main-SendThread(SLAVE:2181):ClientCnxn$SendThread@1158] - Unable to read additional data from server sessionid 0x0, likely server has closed socket, closing socket connection and attempting reconnect

2，分析日志，查看配置问题zoo.cfg, 发现端口设置有问题：

[root@MASTER opt]# cat zookeeper-3.4.9/conf/zoo.cfg
tickTime=2000
initLimit=5
syncLimit=2
dataDir=/root/cluster/opt/zookeeper-3.4.9/data
dataLogDir=/root/cluster/opt/zookeeper-3.4.9/logs
clientPort=4081
server.0=SLAVE:2888:3888
server.1=MASTER:2889:3889

默认端口是4081, 而要求为2181!!

clientPort=2181

3,重新运行，ok

root@MASTER opt]# zkCli.sh -server localhost:2181
Connecting to localhost:2181
2016-11-10 14:47:48,842 [myid:] - INFO [main:Environment@100] - Client environment:zookeeper.version=3.4.9-1757313, built on 08/23/2016 06:50 GMT
2016-11-10 14:47:48,845 [myid:] - INFO [main:Environment@100] - Client environment:host.name=MASTER
2016-11-10 14:47:48,845 [myid:] - INFO [main:Environment@100] - Client environment:java.version=1.8.0_111
2016-11-10 14:47:48,847 [myid:] - INFO [main:Environment@100] - Client environment:java.vendor=Oracle Corporation
2016-11-10 14:47:48,847 [myid:] - INFO [main:Environment@100] - Client environment:java.home=/usr/java/jdk1.8.0_111/jre
2016-11-10 14:47:48,847 [myid:] - INFO [main:Environment@100] - Client environment:java.class.path=/root/cluster/opt/zookeeper-3.4.9/bin/../build/classes:/root/cluster/opt/zookeeper-3.4.9/bin/../build/lib/*.jar:/root/cluster/opt/zookeeper-3.4.9/bin/../lib/slf4j-log4j12-1.6.1.jar:/root/cluster/opt/zookeeper-3.4.9/bin/../lib/slf4j-api-1.6.1.jar:/root/cluster/opt/zookeeper-3.4.9/bin/../lib/netty-3.10.5.Final.jar:/root/cluster/opt/zookeeper-3.4.9/bin/../lib/log4j-1.2.16.jar:/root/cluster/opt/zookeeper-3.4.9/bin/../lib/jline-0.9.94.jar:/root/cluster/opt/zookeeper-3.4.9/bin/../zookeeper-3.4.9.jar:/root/cluster/opt/zookeeper-3.4.9/bin/../src/java/lib/*.jar:/root/cluster/opt/zookeeper-3.4.9/bin/../conf:/usr/java/jdk1.8.0_111/lib
2016-11-10 14:47:48,847 [myid:] - INFO [main:Environment@100] - Client environment:java.library.path=/opt/STM/ST40R5.1.0/lib:/usr/java/packages/lib/i386:/lib:/usr/lib
2016-11-10 14:47:48,847 [myid:] - INFO [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2016-11-10 14:47:48,847 [myid:] - INFO [main:Environment@100] - Client environment:java.compiler=<NA>
2016-11-10 14:47:48,847 [myid:] - INFO [main:Environment@100] - Client environment:os.name=Linux
2016-11-10 14:47:48,847 [myid:] - INFO [main:Environment@100] - Client environment:os.arch=i386
2016-11-10 14:47:48,847 [myid:] - INFO [main:Environment@100] - Client environment:os.version=3.11.10-301.fc20.i686+PAE
2016-11-10 14:47:48,847 [myid:] - INFO [main:Environment@100] - Client environment:user.name=root
2016-11-10 14:47:48,848 [myid:] - INFO [main:Environment@100] - Client environment:user.home=/root
2016-11-10 14:47:48,848 [myid:] - INFO [main:Environment@100] - Client environment:user.dir=/root/cluster/opt
2016-11-10 14:47:48,849 [myid:] - INFO [main:ZooKeeper@438] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@6cdf90
Welcome to ZooKeeper!
2016-11-10 14:47:48,869 [myid:] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1032] - Opening socket connection to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)
JLine support is enabled
2016-11-10 14:47:48,923 [myid:] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@876] - Socket connection established to localhost/127.0.0.1:2181, initiating session
2016-11-10 14:47:48,935 [myid:] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1299] - Session establishment complete on server localhost/127.0.0.1:2181, sessionid = 0x1584ce376210007, negotiated timeout = 30000

WATCHER::

WatchedEvent state:SyncConnected type:None path:null
[zk: localhost:2181(CONNECTED) 0]