The reason why I report an error is that the 2 and 3 node jdks do not set environment variables, resulting in an error contacting service It is probably not running.

I only configured JDK environment variables on node 1, and did not configure JDK environment variables on nodes 2 and 3. (I have three machines configured here)

Execute the VIM /etc/profile command to set the environment variables.

After setting the environment variable, use the command: source /etc/profile to make it effective

After the JDK environment variables of the three machines are set successfully.

Check zookeeper status at startup: zkServer.sh status  three nodes started successfully

Successfully resolved.