Linux——防火墙设置

 

 

CentOS 6.X

  • 查看防水墙是否开启
service iptables status

防水墙开启状态:

防水墙关闭状态:

  • 关闭防火墙
service iptables stop
  • 开机关闭防火墙
chkconfig iptables off

 

 

CentOS 7.X

CentOS 7.0默认使用的是firewall作为防火墙, 使用systemctl来管理服务和程序,包括了service和chkconfig

  • 查看默认防火墙状态
[root@localhost ~]# firewall-cmd --state
not running

注:(关闭后显示not running,开启后显示running)

  • 检查防火墙的状态
[root@localhost ~]# systemctl list-unit-files|grep firewalld.service
firewalld.service                             disabled
或者:
[root@localhost ~]# systemctl status firewalld.service
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)
Active: inactive (dead)                 --表示防火墙已经关闭
  Docs: man:firewalld(1)
  • 开启防火墙
[root@localhost ~]#systemctl start firewalld.service       --启动firewall
[root@localhost ~]# systemctl enable firewalld.service     --开机时启动firewall
Created symlink from /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service to /usr/lib/systemd/system/firewalld.service.
Created symlink from /etc/systemd/system/multi-user.target.wants/firewalld.service to /usr/lib/systemd/system/firewalld.service. 
  • 关闭防火墙
[root@localhost ~]#systemctl stop firewalld.service            --停止firewall
[root@localhost ~]# systemctl disable firewalld.service        --禁止firewall开机启动
Removed symlink /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
  • 重启防火墙
[root@localhost ~]# systemctl restart firewalld.service
  • 查看防火墙是否开机自启
[root@localhost ~]# systemctl is-enabled firewalld.service;echo $?
enabled             --自启
0
或者:
[root@localhost ~]# systemctl is-enabled firewalld.service;echo $?
disabled                --不自启
1
  • 查看已启动的服务列表
[root@localhost ~]# systemctl list-unit-files|grep enabled
auditd.service                                      enabled 
autovt@.service                                     enabled 
avahi-daemon.service                                enabled 
crond.service                                       enabled 
  • 开启端口
[root@localhost ~]# firewall-cmd --zone=public --add-port=80/tcp --permanent
success
命令含义:
–zone #作用域
–add-port=80/tcp #添加端口,格式为:端口/通讯协议
–permanent #永久生效,没有此参数重启后失效
  • 查看已经开放的端口
[root@localhost ~]# firewall-cmd --list-port
80/tcp
  • 屏蔽FirewallD服务
[root@localhost ~]#systemctl mask firewalld
还可以通过创建一个firewall.service到/dev/null的符号连接来屏蔽防火墙服务。
  • 反屏蔽FirewallD服务
[root@localhost ~]#systemctl unmask firewalld
这是反屏蔽FirewallD服务,它会移除屏蔽FirewallD服务时创建的符号链接,故能重新启用服务。
  • 检查是否已安装防火墙
[root@localhost ~]#yum install firewalld firewall-config

 

 

参考:https://blog.csdn.net/cool_summer_moon/article/details/78744009

posted on 2020-08-26 10:56  曹伟雄  阅读(698)  评论(0编辑  收藏  举报

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