How to check linux firewall status

How to check the status of Linux firewall

1. Basic operations

# 查看防火墙状态
service iptables status
# 停止防火墙
service iptables stop
# 启动防火墙
service iptables start
# 重启防火墙
service iptables restart
# 永久关闭防火墙
chkconfig iptables off
# 永久关闭后重启
chkconfig iptables on

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2. Open port 80

vim /etc/sysconfig/iptables
# 加入如下代码
-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT

Save and exit and then restart the firewall

service iptables restart

2. Firewall firewall

1. Check the firewall service status

systemctl status firewalld

If Active: active (running) is highlighted, it means it is in the startup state.

When Active: inactive (dead) appears in gray, it means stop. You can also read the words.

2. Check the status of the firewall

firewall-cmd --state

3. Start, restart, close, firewalld.service service

# 开启service firewalld start# 重启service firewalld restart# 关闭service firewalld stop

4. Check the firewall rules

firewall-cmd --list-all

5. Query, open, and close ports

# 查询端口是否开放
firewall-cmd --query-port=8080/tcp
# 开放80端口
firewall-cmd --permanent --add-port=80/tcp
# 移除端口
firewall-cmd --permanent --remove-port=8080/tcp
#重启防火墙(修改配置后要重启防火墙)
firewall-cmd --reload

Parameter explanation

1. firwall-cmd: It is a tool provided by Linux to operate the firewall;

2. --permanent: Indicates that it is set to be persistent;

3. --add-port: identifies the added port;

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