Linux编程Shell脚本实现关闭CentOS6，7，8防火墙

本文主要是介绍Linux编程Shell脚本实现关闭CentOS6，7，8防火墙，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

关闭防火墙

内网服务器防火墙需要在初始化时关闭。

#!/bin/bash
### 常规操作，添加系统函数
. /etc/init.d/functions
### 前置操作系统判断
os_v(){
uname -a|awk -F" u|c|C|-" '{print $2}'
}
### CentOS7和8关闭防火墙disable_78fw(){
systemctl disable --now firewalld &> /dev/null
action "CentOS`os_v`防火墙已关闭!"
}### CentOS6关闭防火墙
disable_6fw(){
chkconfig iptables off
action "CentOS`os_v`防火墙已关闭!"
}
### Ubuntu20关闭防火墙
#disable_U20(){
#sudo systemctl diskable --now ufw &> /dev/null
#action "Ubuntu`os_v`防火墙已关闭!"   
#}if [ `os_v` -eq 6 ];then disable_6fw
#elif [ $ov -eq 20 ];then 
#	disable_U20
elsedisable_78fw
fi
echo "`hostname`关闭防火墙完成"

CentOS 6 测试成功

[root@C6-56 ~]# chkconfig iptables on
[root@C6-56 ~]# chkconfig --list iptables
iptables       	0:off	1:off	2:on	3:on	4:on	5:on	6:off
[root@C6-56 ~]# bash disablefw.sh 
CentOS6防火墙已关闭!                                       [  OK  ]
C6-56关闭防火墙完成
[root@C6-56 ~]# chkconfig --list iptables
iptables       	0:off	1:off	2:off	3:off	4:off	5:off	6:off

CentOS 8 测试成功

[02:06:51 rooter@C8-3-55 ~]#systemctl status firewalld.service 
● firewalld.service - firewalld - dynamic firewall daemonLoaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset:>Active: active (running) since Thu 2021-04-22 02:06:51 EDT; 6s agoDocs: man:firewalld(1)Main PID: 3744 (firewalld)Tasks: 2 (limit: 11337)Memory: 29.0MCGroup: /system.slice/firewalld.service└─3744 /usr/libexec/platform-python -s /usr/sbin/firewalld --nofork --nopid4月 22 02:06:50 C8-3-55 systemd[1]: Starting firewalld - dynamic firewall daemon...
4月 22 02:06:51 C8-3-55 systemd[1]: Started firewalld - dynamic firewall daemon.
[02:07:00 rooter@C8-3-55 ~]#bash disablefw.sh 
disablefw.sh: 第 28 行:[: -eq: 需要一元表达式
CentOS8防火墙已关闭!                                       [  确定  ]
C8-3-55关闭防火墙完成
[02:07:09 rooter@C8-3-55 ~]#systemctl status firewalld.service 
● firewalld.service - firewalld - dynamic firewall daemonLoaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset>Active: inactive (dead)Docs: man:firewalld(1)4月 22 02:06:50 C8-3-55 systemd[1]: Starting firewalld - dynamic firewall daemon...
4月 22 02:06:51 C8-3-55 systemd[1]: Started firewalld - dynamic firewall daemon.
4月 22 02:07:09 C8-3-55 systemd[1]: Stopping firewalld - dynamic firewall daemon...
4月 22 02:07:09 C8-3-55 systemd[1]: Stopped firewalld - dynamic firewall daemon.