For various reasons, many Linux users want to learn how to disable the firewall on CentOS 7.
If you are one of them, continue reading and learn everything about CentOS turn off the firewall conveniently.
We will also discuss the consequences of disabling the firewall and give you a better idea.
Firewall on CentOS
CentOS, like any other operating system, has a built-in firewall. Basically, a firewall is a feature that allows takes control of outgoing and incoming traffic.
This is vital to identify potentially harmful and malicious applications traversing the network. In addition to that, a firewall can empower system administrators with various extra abilities.
A system administrator can enable a system administrator to determine whether or not to block the ports.
In general, Linux comes with various firewall systems. The most common firewall used in an operating system like CentOS is FirewallD. FirewallD is the shortened form of Dynamic Firewall Manager.
Simply, FirewallD is a front-end, dynamic firewall management service. FirewallD comes as a default service on CentOS and Fedora platforms. This option allows you to manage both IPv4 and IPv6 network traffic.
We don’t encourage our readers to disable the firewall on CentOS 7. If you go for ‘CentOS turn off firewall,’ that can weaken the overall cybersecurity of your system.
If you disable the firewall, the threats that are lurking on the internet can target your computer easily. Your privacy and the data will be at a significant threat in that case.
So, it is compulsory to know the seriousness of the threat before heading towards a ‘CentOS turn off firewall.’
PS: here are full IDS vs. Firewall vs. IPS comparison for your reference.
Why Do You Want a Firewall on CentOS?
Here are some obvious reasons why a firewall is included in your OS.
● It can monitor traffic
A firewall can monitor traffic that enters your computer. A firewall like FirewallD can monitor both incoming and outgoing traffic. The information on the networks is sent and received in the form of packets.
These packets are monitored to determine if there is something suspicious. If so, the respective packets will be immediately blocked without letting them do any harm.
● To block Trojans
Another important task performed by firewalls is that they can block known Trojans as well. Trojans can enter your system and sit quietly while tracking all the actions and data.
Then, the information will be transmitted to a remote server, which seriously threatens your privacy. So, it is always better to install a firewall to minimize the chances of getting Trojan attacks.
● To protect the computer from hackers
In the absence of a firewall, your computer can be an easy target for a hacker. They use various methods to access your computer (through botnets, for example).
A firewall can work as a shield against those attempts and offer protection.
Why Do You Want to Disable the Firewall on CentOS 7?
Firewalls are included in most operating systems because of security reasons. However, some individuals want to disable those firewalls due to various reasons. One of the most common reasons for an individual to disable a firewall is to install certain applications.
That means some applications stop delivering full performance when an active firewall is established. So, to yield the best of those applications, one might need to disable the firewall first.
In addition to that, some individuals experience a slight lag on their network connection because of the firewall. So, they want to try disabling the firewall and check if the speed gets ok.
CentOS Turn Off Firewall – How to Do It?
Now that you know the consequences of disabling the firewall on your CentOS, the decision is up to you. If you still want to disable your firewall, this section will tell you how to do it.
What you must have;
You must have a couple of basic things before disabling the firewall on CentOS 7.
- A user account that has Sudo privileges
- Ability to access a command-line interface (by pressing Ctrl + Alt + T).
- A computer that runs on CentOS 7.
● Check the Status of FirewallD
Now, you should check the status of FirewallD to disable Firewall on CentOS 7.
This option is generally activated automatically by default on all CentOS 7 machines.
To check the status of FirewallD, you can use the following command through the command-line interface.
“sudo systemctl status firewalld”
If the firewall is active and running, you should see the text in a bright green color. The text should say the firewall is currently active. You don’t have to worry about disabling it if it is not active. However, if it is active, you can proceed with the next steps.
● Disabling FirewallD on Your CentOS 7
If the firewall is active, you can choose to disable it permanently or temporarily. For our readers, we explain the steps to accomplish both options.
CentOS turned off the firewall temporarily
First, let’s learn how to disable the firewall on a temporary basis. In this case, you will have to use the following command on the command-line interface.
“sudo systemctl stop firewalld”
Please note that you will not get a confirmation message after entering the code. So, if you want to check the status of the firewall, enter the code
“sudo systemctl status firewalld.”
You will see the code Active: inactive (dead).
This command will disable the firewall until you perform a reboot. That means this command will disable the firewall on a temporary basis. Once the runtime session is ended and the system is rebooted, you will see the active firewall once again.
Disable the firewall permanently
Some users prefer turning off the firewall permanently. If you want to do it with your system as well, you can follow the steps mentioned below.
To get it stopped, you should run the command;
“sudo systemctl stop firewalld”
Well, as you can notice, it is the same command that is used in the previous process. You can check the firewall status now by entering the command
“sudo systemctl status firewalld.”
You will now see an output that says the service is inactive. If you leave it as it is, the firewall will activate once you reboot the machine. So, our next step should be to prevent that from happening. To get it done, you should enter the command mentioned below.
“sudo systemctl disable firewalld”
That’s it. Now, the firewall will keep deactivated even if you restart the machine.
It is true that you have successfully stopped the firewall service on CentOS 7. But you should also know that there can be other services that can activate it back.
So, if you are looking for a permanent inactivation of your firewall, you must follow the steps below. These steps will prevent other services from reactivating your firewall.
“sudo systemctl mask –now firewalld”
This command will create a symbolic link (which is also called symlink). It creates from the FirewallD service to /dev/null.
Then, the output will appear as the following.
Created symlink from /etc/systemd/system/firewalld.service to /dev/null.
The Bottom Line
Now that you may have gained a good awareness of disabling the firewall on your CentOS. In addition, you have learned how to mask it so other services will not reactivate it. If you expect better security on your system or server, we don’t encourage you to disable the firewall.
Basically, if you disable the firewall on CentOS 7, the system’s cybersecurity will be weakened significantly. The consequences of such a practice can be pretty harmful. This is particularly true when it comes to live servers.
So, you must always think twice before disabling a firewall. This is applicable even to test environments. If you have further questions, please let us know.