Zookeeper连接超时

一、错误描述

安装完zookeeper后，启动服务，然后进行测试，报“Error contacting service. It is probably not running.”，使用客户端命令zkCli.sh提示“java.net.ConnectException: 拒绝连接..”异常，如下所示

[root@localhost bin]# sh zkCli.sh -server 127.0.0.1:2181
Connecting to 127.0.0.1:2181
2016-09-24 16:33:21,601 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.6-1569965, built on 02/20/2014 09:09 GMT
...
java.net.ConnectException: 拒绝连接
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:701)
        at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
JLine support is enabled

二、解决方法

1.查看/conf/zoo.cfg配置文件，如下所示

tickTime=30000
initLimit=10
syncLimit=5
dataDir=/data/zookeeper
dataLogDir=/data/logs
clientPort=2181

2.如上配置内容所示，由于配置数据存在路径dataDir、日志存储路径dataLogDir，但是实际不存在该目录，造成zookeeper无发正常启动，创建这两个目录，再重启服务

[root@localhost bin] # mkdir /data/zookeeper
[root@localhost bin] # mkdir /data/logs
[root@localhost bin] # sh zkServer.sh restart
Using config:  /usr/local/zookeeper-3 .4.6 /bin/ .. /conf/zoo .cfg
JMX enabled by default
Using config:  /usr/local/zookeeper-3 .4.6 /bin/ .. /conf/zoo .cfg
Stopping zookeeper ...  /usr/local/zookeeper-3 .4.6 /bin/zkServer .sh: line 143:  kill : (9075) - 没有那个进程
STOPPED
JMX enabled by default
Using config:  /usr/local/zookeeper-3 .4.6 /bin/ .. /conf/zoo .cfg
Starting zookeeper ... STARTED

3.测试服务已正常

[root@localhost bin] # telnet localhost 2181
Trying 127.0.0.1...
Connected to localhost.localdomain (127.0.0.1).
Escape character is  '^]' .
Connection closed by foreign host.

[root@localhost bin] # sh zkServer.sh status
JMX enabled by default
Using config:  /usr/local/zookeeper-3 .4.6 /bin/ .. /conf/zoo .cfg
Mode: standalone

[root@localhost bin] # sh zkCli.sh -server 127.0.0.1:2181
Connecting to 127.0.0.1:2181
2016-09-24 17:02:38,607 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.6-1569965, built on 02 /20/2014  09:09 GMT
...
Welcome to ZooKeeper!
JLine support is enabled
2016-09-24 17:02:38,843 [myid:] - INFO  [main-SendThread(127.0.0.1:2181):ClientCnxn$SendThread@1235] - Session establishment complete on server 127.0.0.1 /127 .0.0.1:2181, sessionid = 0x1575b644d900000, negotiated timeout = 60000

WATCHER::

WatchedEvent state:SyncConnected  type :None path:null
[zk: 127.0.0.1:2181(CONNECTED) 0]  ls  /
[zookeeper]
[zk: 127.0.0.1:2181(CONNECTED) 1] create  /test  hello
Created  /test
[zk: 127.0.0.1:2181(CONNECTED) 4]  set  /test  hello
cZxid = 0x2
ctime = Sat Sep 24 17:03:15 CST 2016
mZxid = 0x3
mtime = Sat Sep 24 17:04:16 CST 2016
pZxid = 0x2
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 5
numChildren = 0
[zk: 127.0.0.1:2181(CONNECTED) 5] get  /test
hello
cZxid = 0x2
ctime = Sat Sep 24 17:03:15 CST 2016
mZxid = 0x3
mtime = Sat Sep 24 17:04:16 CST 2016
pZxid = 0x2
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 5
numChildren = 0
[zk: 127.0.0.1:2181(CONNECTED) 6]