解决办法

1、先确定网络是否正常？

2、先确定zk是否启动成功？

重新启动一下Zk即可！ 

/opt/modules/zookeeper-3.4.5
#进入后，使用下面命令启动正常 
bin/zkServer.sh start
## sh   zkServer.sh start  启动回报错误

LOOKING (my state)
2020-02-07 13:49:18,539 [myid:1] - WARN  [WorkerSender[myid=1]:QuorumCnxManager@368] - Cannot open channel to 2 at election address CentOSA/192.168.184.128:3888
java.net.ConnectException: Connection refused (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:354)
    at org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:327)
    at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:393)
    at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:365)
    at java.lang.Thread.run(Thread.java:748)
2020-02-07 13:49:18,540 [myid:1] - WARN  [WorkerSender[myid=1]:QuorumCnxManager@368] - Cannot open channel to 3 at election address CentOSB/192.168.184.130:3888
java.net.ConnectException: Connection refused (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)