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zookeeper启动失败案例分析

启动zookeeper运行结果如下： 
[root@zk1 bin]# ./zkServer.sh start
JMX enabled by default
Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
查看状态如下： 
[root@zk1 bin]# ./zkServer.sh status
JMX enabled by default
Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg
Error contacting service. It is probably not running.
我netstat -anltup |grep 2018,并没有监听，端口没有占用啊？   那只好去看日志了，查看zookeeper的zookeeper.out日志内容如下： 
2016-02-24 17:35:22,425 [myid:] - ERROR [main:ZooKeeperServerMain@63] - Unexpected exception, exiting abnormally
java.net.BindException: Address already in use
    at sun.nio.ch.Net.bind0(Native Method)
    at sun.nio.ch.Net.bind(Net.java:344)
    at sun.nio.ch.Net.bind(Net.java:336)
    at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:199)
    at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
    at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:67)
    at org.apache.zookeeper.server.NIOServerCnxnFactory.configure(NIOServerCnxnFactory.java:95)
    at org.apache.zookeeper.server.ZooKeeperServerMain.runFromConfig(ZooKeeperServerMain.java:110)
    at org.apache.zookeeper.server.ZooKeeperServerMain.initializeAndRun(ZooKeeperServerMain.java:86)
    at org.apache.zookeeper.server.ZooKeeperServerMain.main(ZooKeeperServerMain.java:52)
    at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:116)
    at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:78)
从日志中"Address already in use"可以看出端口被占用了！ 但我用netstat -lntup是没被使用的，再用 lsof -i:2181，发现了2181端口果然被占用了。其实最好的办法是nc -v -z locahost 2181 探测一些本地2181端口是否监听！ 
[root@zk1 ~]# nc -v -z localhost 2181
Connection to localhost 2181 port [tcp/eforward] succeeded!
[root@zk1 ~]#
好了，端口被占用了，只能修改zk的默认端口，从新启动ok！
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2016-02-24

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