Centos7查看防火墙开放端口、状态、开放端口

查看防火墙状态

命令：systemctl status firewalld

[root@MyCloudServer home]# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
   Active: active (running) since 四 2021-04-08 09:37:54 CST; 1h 46min ago
     Docs: man:firewalld(1)
 Main PID: 28871 (firewalld)
   CGroup: /system.slice/firewalld.service
           └─28871 /usr/bin/python2 -Es /usr/sbin/firewalld --nofork --nopid
4月 08 09:37:54 MyCloudServer systemd[1]: Starting firewalld - dynamic firewall daemon...
4月 08 09:37:54 MyCloudServer systemd[1]: Started firewalld - dynamic firewall daemon.
4月 08 09:37:54 MyCloudServer firewalld[28871]: WARNING: AllowZoneDrifting is enabled. This is considered an insecure configuration option. It will be removed in a future release. Please consider disabling it now.
4月 08 11:14:05 MyCloudServer firewalld[28871]: WARNING: ALREADY_ENABLED: 3306:tcp
4月 08 11:14:11 MyCloudServer firewalld[28871]: WARNING: AllowZoneDrifting is enabled. This is considered an insecure configuration option. It will be removed in a future release. Please consider disabling it now.
Hint: Some lines were ellipsized, use -l to show in full.

查看已开放的端口

命令：firewall-cmd —list-all

[root@MyCloudServer home]# firewall-cmd --list-all
public (active)
  target: default
  icmp-block-inversion: no
  interfaces: eth0
  sources: 
  services: dhcpv6-client ssh
  ports: 3306/tcp
  protocols: 
  masquerade: no
  forward-ports: 
  source-ports: 
  icmp-blocks: 
  rich rules:

防火墙开放端口

命令：firewall-cmd —zone=public —add-port=3306/tcp —permanent

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
firewall-cmd —reload 并不中断用户连接，即不丢失状态信息

重启防火墙: firewall-cmd —reload

[root@MyCloudServer home]# firewall-cmd --zone=public --add-port=3306/tcp --permanent
success
[root@MyCloudServer home]# firewall-cmd --reload
success

使用总结

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

其他命令

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在这里插入代码片

附systemctl命令使用方法。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