Firewall configuration_centos firewall iptables operation usage

The firewall in centos is a very powerful function, but it has been upgraded in the firewall in centos. Let's take a look at the usage of the firewall in centos in detail.

Basic firewall operationsCommand

Query the Firewall Status: [root @ localhost ~] # Service iptables status <回车>

Stop firewall: [root @ localhost ~] # Service iptables stop <回车>

Start firewall: [root @ localhost ~] # Service iptables start <回车>

Restart firewall: [root @ localhost ~] # Service iptables restart <回车>

Permanently disable the firewall: [root @ localhost ~] # Chkconfig iptables off <回车>

Enable after permanent shutdown: [root @ localhost ~] # Chkconfig iptables on <回车>

1. view the Firewall Status

2. Edit the/etc/sysconfig/iptables file. Port 8080 and port 9990 must be enabled in our instance.

Open/etc/sysconfig/iptables in the editor

3. Add port 8080 and port 9990 as needed

4. Save the/etc/sysconfig/iptables file and run the command on the terminal.

[Root @ localhost ~] # Service iptables restart <回车>

5. view the firewall status again

[Root @ localhost ~] # Service iptables status <回车>

6. At this time, ports 8080 and 9990 of the server can provide external services.

7. The open mode of other ports is similar to the open mode.