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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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