zookeeper的使用
zookeeper的使用zookeeper启动之后，不需要执行命令，只需查看批准的状况，命令如下：
１、ruok - The server will respond with imok if it is running. Otherwise it will not respond at all.
２、kill - When issued from the local machine, the server will shut down.
３、dump - Lists the outstanding sessions and ephemeral nodes. This only works on the leader.
４、stat - Lists statistics about performance and connected clients.
例如：
$echo ruok | nc 127.0.0.1 3355
Imok$
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