centos 79 安装ufw

To install UFW (Uncomplicated Firewall) on CentOS 7.9, you can follow these steps:

1. Update the system packages:

   sudo yum update
   

2. Install UFW:

   sudo yum install ufw
   

3. Enable UFW to start on system boot:

   sudo systemctl enable ufw
   

4. Start the UFW service:

   sudo systemctl start ufw
   

5. Check the UFW status:

   sudo ufw status
   

   You should see the UFW status as "inactive" initially.

6. Configure UFW rules as per your requirements. For example, to allow SSH connections, you can use the following command:

   sudo ufw allow ssh
   

   You can add other rules based on your needs.

7. Enable UFW:

   sudo ufw enable
   

   Confirm the operation by typing 'y' and pressing Enter.

8. Check the UFW status again:

   sudo ufw status
   

   You should see the UFW status as "active" with the configured rules.

That's it! You have successfully installed and configured UFW on CentOS 7.9