View Zookeeper cluster status with shell scripts

Zooper Cluster Structure:
Host name role
Node1 Follower
Node2 leader
Node3 Follower
Master Observer
Script content:
#!/bin/bash
function GetStatus () {
#定义一个函数
EXEC 9<>/dev/tcp/$1/2181 2>/dev/null
#打开host的port a read-write socket connection that is connected to the file descriptor 9
Echo Stat >&9
#将 "Stat" sent to the socket connection
mode=$ (Cat <&9 |grep-po "(? <=mode:). ")
#从socket返回数据中提取Mode的值 and assign a value to mode
EXEC 9<&-#关闭通道
Echo ${mode:-null}
#输出MODE *
}
For i in node{1..3} nn01;do
Echo-ne "${i}\t"

• #输出i, do not wrap and TAB key to make a space
  GetStatus ${i}
  #执行函数 GetStatus and assign values to positional variables *
  Done

Script Execution Results:
Node1 Follower
Node2 leader
Node3 Follower
Master Observer

View Zookeeper cluster status with shell scripts