zookeeper 集群 Cannot open channel to X at election address Error contacting service. It is probably n

本文链接：https://blog.youkuaiyun.com/ssllkkyyaa/article/details/82426977

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.youkuaiyun.com/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