[Solved] Error contacting service. It is probably not running.

First, check whether more than half of the servers start zookeeper. If yes, use the JPS command and find that the quorumpeermain main class is not started

[atguigu@Hadoop103 zookeeper-3.5.7]$ jps
14850 Jps

The most likely cause: Zookeeper decompression path in the conf folder zoo.cfg (I am here after changing the name) configuration when adding the content after the addition of a space and the creation of myid up and down there are empty lines or left and right spaces, enter the file deleted, and then check the jps

#######################cluster########################## 
server.2=hadoop102:2888:3888 
server.3=hadoop103:2888:3888 
server.4=hadoop104:2888:3888

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