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This article introduces how to configure and close the CentOS operating system firewall, the content is very detailed, interested friends can refer to, I hope it can be helpful to you.

When we use the CentOS operating system, our firewall configuration is very important, it is related to the safety of our computers. Once when installing and configuring the ORACLE database under the CentOS operating system, it always showed that the EM installation failed due to the network port, so I planned to turn off the firewall first. Came across a firewall configuration instructions, I think it's not bad.

one。 Execute the "setup" command to start the text mode configuration utility

Select Firewall configuration in "Select a tool", then select the "run tools" button, the firewall configuration interface appears, set the security level to "disabled", and then select "OK".

Or we can use commands in the CentOS operating system:

# / sbin/iptables-I INPUT-p tcp-dport 80-j ACCEPT

# / sbin/iptables-I INPUT-p tcp-dport 22-j ACCEPT

# / etc/rc.d/init.d/iptables save

two。 Restart the computer.

The 1.CentOS operating system firewall has ports 80 and 22 open by default.

two。 It should be possible not to restart the computer here:

# / etc/init.d/iptables restart

If the firewall is turned off, just turn off its service:

3. View firewall information:

# / etc/init.d/iptables status

4. Turn off the firewall service:

# / etc/init.d/iptables stop

3. * disable the firewall

We can also turn off the firewall, but I don't recommend it. * turn off the firewall can do this:

# chkconfig-level 35 iptables off

It can also be modified directly.

/ etc/sysconfig/iptables

Add a

-A RH-Firewall-1-INPUT-m state-- state NEW-m tcp-p tcp-- dport 80-j ACCEPT

In this way, we have introduced how to configure and shut down the CentOS operating system firewall.

On how to configure and close the CentOS operating system firewall to share here, I hope that the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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