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高概率：1端口占用
查看某一端口是否被占用
netstat -tunlp |grep 2181
2 配置不对：如下帖
1.问题现象。 启动每一个都提示 STARTED 但是查看 status时全部节点都报错
[root@ip-172-31-19-246 bin]# sh zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.4.8/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[root@ip-172-31-29-48 bin]# sh zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.4.8/bin/../conf/zoo.cfg
Error contacting service. It is probably not running.
2.打印日志 看报错 全部节点都报这个错误
tail -1000f zookeeper.out
2016-04-27 01:22:50,087 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:QuorumPeer$QuorumServer@149] - Resolved hostname: node2.vvshop.cc to address: node2.vvshop.cc/54.254.152.81
2016-04-27 01:22:50,088 [myid:1] - WARN [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:QuorumCnxManager@400] - Cannot open channel to 3 at election address node3.vvshop.cc/52.221.223.222:3888
java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:381)
at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:426)
at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:843)
at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:822)
2016-04-27 01:22:50,319 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:QuorumPeer$QuorumServer@149] - Resolved hostname: node3.vvshop.cc to address: node3.vvshop.cc/52.221.223.222
2016-04-27 01:22:50,319 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:FastLeaderElection@852] - Notification time out: 60000
3.网上寻求解决方案
1.http://freeman983.iteye.com/blog/2053037 log目录没有创建导致出错 并不是原因。
2.http://blog.csdn.net/qianggezhishen/article/details/49363349 （我的配置都是对的 但是仍然报错）
ZooKeeper安装使用时遇到各种奇怪问题的解决方法：
1.nohup：failed to run command ‘Java’: No such file or directory
2.Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
a.检查myid文件数字是否跟配置的能对的上
b.检查myid文件是否已经拷贝到dataDIr配置的路径里了
c.检查/etc/profile和/etc/environment 是否设置了Java和Zookeeper的路径
d.Zookeeper集群节点必须是3个以上
3.还是 歪果仁给力 stackoverflow 查到解决方案：
http://stackoverflow.com/questions/30940981/zookeeper-error-cannot-open-channel-to-x-at-election-address
例如：
<span style="color:#000000"><span style="color:#393318"><code><span style="color:#303336">server</span><span style="color:#0c0d0e">.</span><span style="color:#b00633">1</span><span style="color:#0c0d0e">=</span><span style="color:#b00633">0.0</span><span style="color:#0c0d0e">.</span><span style="color:#b00633">0.0</span><span style="color:#0c0d0e">:</span><span style="color:#b00633">2888</span><span style="color:#0c0d0e">:</span><span style="color:#b00633">3888</span><span style="color:#303336">
server</span><span style="color:#0c0d0e">.</span><span style="color:#b00633">2</span><span style="color:#0c0d0e">=</span><span style="color:#b00633">192.168</span><span style="color:#0c0d0e">.</span><span style="color:#b00633">10.10</span><span style="color:#0c0d0e">:</span><span style="color:#b00633">2888</span><span style="color:#0c0d0e">:</span><span style="color:#b00633">3888</span><span style="color:#303336">
server</span><span style="color:#0c0d0e">.</span><span style="color:#b00633">3</span><span style="color:#0c0d0e">=</span><span style="color:#b00633">192.168</span><span style="color:#0c0d0e">.</span><span style="color:#b00633">2.1</span><span style="color:#0c0d0e">:</span><span style="color:#b00633">2888</span><span style="color:#0c0d0e">:</span><span style="color:#b00633">3888</span></code></span></span>
Step 1:
Node 1:
zoo.cfg
server.1= 0.0.0.0:<port>:<port2>
server.2= <IP>:<port>:<port2>
.
.
.
server.n= <IP>:<port>:<port2>
Node 2 :
server.1= <IP>:<port>:<port2>
server.2= 0.0.0.0:<port>:<port2>
.
.
.
server.n= <IP>:<port>:<port2>
如愿看到：
[root@ip-172-31-29-48 bin]# sh zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.4.8/bin/../conf/zoo.cfg
Mode: leader
[root@ip-172-31-23-7 bin]# sh zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.4.8/bin/../conf/zoo.cfg
Mode: follower
[root@ip-172-31-19-246 bin]# sh zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.4.8/bin/../conf/zoo.cfg
Mode: follower
如果遇到 java.net.NoRouteToHostException: No route to host
建议关闭防火墙试试
Java.net.NoRouteToHostException:No route to host
上网查询的结论如下：
没有路由连接到本机，无法到达远程主机，
原因：防火墙干扰或中间路由器停机
(用telnet查看该机器是否正常连接，结果如下：
Trying 199.155.122.91...
telnet: connect to address 199.155.122.91: No route to host
telnet: Unable to connect to remote host: No route to host)
解决的办法是：和防火墙规则有关，关闭防火墙就可以了
关闭防火墙之后，结果如下：
Trying 199.155.122.91...
telnet: connect to address 199.155.122.91: Connection refused
telnet: Unable to connect to remote host: Connection refused
http://blog.csdn.net/chenyi8888/article/details/8552860
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