[NOTE] Linux防火墙

CentOS firewalld

Firewalld is installed on CentOS 7 as default. Here comes some operations of it.

• Check firewall status: sudo firewall-cmd --state
• Disable firewalld: sudo systemctl disable firewalld(禁止开机启动)
• Stop firewalld: sudo systemctl stop firewalld

Ubuntu 18.04 ufw

• check a current firewall status:sudo ufw status
• for more verbose:sudo ufw status verbose
• enable firewall:sudo ufw enable
• disable firewall:sudo ufw disable

基操：

• sudo ufw default deny incoming
• sudo ufw default allow outgoing
• sudo ufw allow ssh or sudo ufw allow 22
• sudo ufw allow 2222
• sudo ufw allow http or sudo ufw allow 80
• sudo ufw allow https or sudo ufw allow 443
• sudo ufw allow 6000:6003/tcp
• sudo ufw allow 6000:6003/udp