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CentOS 7 之前的版本使用iptables
1.开放80,22,8080 端口
/sbin/iptables -I INPUT -p tcp --dport 80 -j ACCEPT
2.保存
/etc/rc.d/init.d/iptables save
3.查看打开的端口
/etc/init.d/iptables status
4.关闭防火墙
1) 永久性生效,重启后不会复原
开启:chkconfig iptables on
关闭:chkconfig iptables off
2) 即时生效,重启后复原
开启:service iptables start
关闭:service iptables stop
centos7不再使用原来的iptables,启用firewall
1、firewalld的基本使用
启动: systemctl start firewalld
关闭: systemctl stop firewalld
查看状态: systemctl status firewalld
开机禁用 : systemctl disable firewalld
开机启用 : systemctl enable firewalld
2.systemctl是CentOS7的服务管理工具中主要的工具,它融合之前service和chkconfig的功能于一体。
启动一个服务:systemctl start firewalld.service
关闭一个服务:systemctl stop firewalld.service
重启一个服务:systemctl restart firewalld.service
显示一个服务的状态:systemctl status firewalld.service
在开机时启用一个服务:systemctl enable firewalld.service
在开机时禁用一个服务:systemctl disable firewalld.service
查看服务是否开机启动:systemctl is-enabled firewalld.service
查看已启动的服务列表:systemctl list-unit-files|grep enabled
查看启动失败的服务列表:systemctl –failed
3.配置firewalld-cmd
查看版本: firewall-cmd –version
查看帮助: firewall-cmd –help
显示状态: firewall-cmd –state
查看所有打开的端口: firewall-cmd –zone=public –list-ports
更新防火墙规则: firewall-cmd –reload
查看区域信息: firewall-cmd –get-active-zones
查看指定接口所属区域: firewall-cmd –get-zone-of-interface=eth0
拒绝所有包:firewall-cmd –panic-on
取消拒绝状态: firewall-cmd –panic-off
查看是否拒绝: firewall-cmd –query-panic
添加一个端口常用操作
查看状态:
systemctl status firewalld
[root@iz init.d]# systemctl status firewalld
● firewalld.service
Loaded: masked (/dev/null; bad)
Active: inactive (dead) //说明防火墙未启动
启用防火墙
systemctl start firewalld
[root@iz init.d]# systemctl start firewalld
Failed to start firewalld.service: Unit is masked.//说明防火墙被屏蔽
解除屏蔽
systemctl unmask firewalld
[root@iz init.d]# systemctl unmask firewalld
Removed symlink /etc/systemd/system/firewalld.service.
查看已开放的端口(默认不开放任何端口)
firewall-cmd –list-ports
开启80端口
firewall-cmd –zone=public(作用域) –add-port=80/tcp(端口和访问类型) –permanent(永久生效)
重启防火墙
firewall-cmd –reload
查看
firewall-cmd –zone= public –query-port=80/tcp
停止防火墙
systemctl stop firewalld.service
禁止防火墙开机启动
systemctl disable firewalld.service
删除
firewall-cmd –zone= public –remove-port=80/tcp –permanent
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