方法一
Telnet命令
相關服務安裝:
yum install telnet-server
telnet baidu.com 80
方法二
nmap命令
相關服務安裝:
yum install -y nmap
nmap ip -p port
方法三
nc命令
相關服務安裝:
yum install -y nc
nc -v ip port
腳本判斷遠程端口是否可用
#!/bin/bash
if [ `nmap 10.150.132.95 -p 3306 | grep closed | wc -l` -lt 2 ];then #This ip for mysql server ip which app connect
systemctl stop keepalived
echo "mysql is down"
exit 0
fi