zookeeper 启动错误Error contacting service. It is probably not running

./zkServer.sh start

zookeeper版本为apache-zookeeper-3.7.1
启动zookeeper后

[root@localhost bin]# ./zkServer.sh start
/data/jdk/jdk1.8.0_261/bin/java
ZooKeeper JMX enabled by default
Using config: /data/zk/zookeeper/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

查看zookeeper的状态

[root@localhost bin]# ./zkServer.sh status
/data/jdk/jdk1.8.0_261/bin/java
ZooKeeper JMX enabled by default
Using config: /data/zk/zookeeper/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost. Client SSL: false.
Error contacting service. It is probably not running.

网上找了很多，基本上说的是myid配置问题，或者日志路径不对，没有提前创建好日志的路径等等，都是不错的思路，但是本人都一一尝试没有解决，没有办法还是只能靠自己，只能去看kafka的启动日志。
查看日志

本人的日志路径为:/data/zk/zookeeper/logs下的 zookeeper-root-server-localhost.localdomain.out

本人不确定不同kafka版本日志的名字是否相同，但是大同小异，这里的kafka版本为apache-zookeeper-3.7.1

查看日志后发现如下:

2022-05-14 04:00:39,030 [myid:1] - WARN  [QuorumConnectionThread-[myid=1]-1:QuorumCnxManager@401] - Cannot open channel to 2 at election address /192.168.234.141:3888
java.net.NoRouteToHostException: No route to host (Host unreachable)at java.net.PlainSocketImpl.socketConnect(Native Method)at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:476)at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:218)at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:200)at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:394)at java.net.Socket.connect(Socket.java:606)at org.apache.zookeeper.server.quorum.QuorumCnxManager.initiateConnection(QuorumCnxManager.java:384)at org.apache.zookeeper.server.quorum.QuorumCnxManager$QuorumConnectionReqThread.run(QuorumCnxManager.java:458)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)at java.lang.Thread.run(Thread.java:748)

由此可见，没办法连接另一台的机器141(本机像作为master ip为140)，于是去看看防火墙是否拦截

查看防火墙状态

systemctl status firewalld

要么停止防火墙，要么配置相关规则
下面附赠防火墙相关命令

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