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安装好zookeeper-3.4.10，顺利启动：

[root@node228 bin]# ./zkServer.sh startZooKeeper JMX enabled by defaultUsing config: /usr/zookeeper-3.4.10/bin/../conf/zoo.cfgStarting zookeeper ... STARTED

jps也可以看到进程：

[root@node228 bin]# jps2788 QuorumPeerMain2917 Jps

查看zookeeper状态：出错了！！！

[root@node228 bin]# ./zkServer.sh statusZooKeeper JMX enabled by defaultUsing config: /usr/zookeeper-3.4.10/bin/../conf/zoo.cfgError contacting service. It is probably not running.

查看/bin目录下的zookeeper.out日志：

2018-05-16 16:14:35,387 [myid:1] - WARN  [WorkerSender[myid=1]:QuorumCnxManager@588] - Cannot open channel to 2 at election address slave/192.168.255.129:3888java.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:562)	at org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:538)	at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:452)	at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:433)	at java.lang.Thread.run(Thread.java:748)

排除所有的配置问题后，还有出现，这是为啥呢？

那是因为只有这个节点的进程启动了，其他节点的进程还没有启动，这个节点的进程无法与其他节点进行交互，更无法选出leader和follwer,所以这个节点不知道自己到底是leader还是follwer，当然也就显示不了status了。

开启其他节点进程：

[root@node224 bin]# ./zkServer.sh startZooKeeper JMX enabled by defaultUsing config: /usr/zookeeper-3.4.10/bin/../conf/zoo.cfgStarting zookeeper ... STARTED[root@node224 bin]# jps4987 QuorumPeerMain5023 Jps[root@node224 bin]#

再查看两个节点status:

[root@node228 bin]# ./zkServer.sh statusZooKeeper JMX enabled by defaultUsing config: /usr/zookeeper-3.4.10/bin/../conf/zoo.cfgMode: follower[root@node228 bin]#

[root@node224 bin]# ./zkServer.sh statusZooKeeper JMX enabled by defaultUsing config: /usr/zookeeper-3.4.10/bin/../conf/zoo.cfgMode: leader[root@node224 bin]#

哈哈，成功啦！！！

如果早点看懂原理，也就不用花这么长时间做测试了