How To Disable and Stop Firewall on Linux(CentOS/Ubuntu)

This post will guide you how to disable Firewall on your CentOS 7 or CentOS 8 or Ubuntu Linux system. How do I Stop Firewalld or UFW service on your CentOS or Ubuntu Linux from the command line.

• What is Firewalld
• What is UFW
• Checking Firewall Status
• Disabling Firewall
• Enabling Firewall
• Stopping Firewall

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What is Firewalld

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firewalld provides a dynamically managed firewall with support for network/firewall zones to define the trust level of network connections or interfaces. It has support for IPv4, IPv6 firewall settings and for ethernet bridges and has a separation of runtime and permanent configuration options. It also supports an interface for services or applications to add firewall rules directly.

What is UFW

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UFW is used by Ubuntu and Debian Linux system for managing a netfilter firewall. This program is for managing a Linux firewall and aims to provide an easy to use interface for the user.

Checking Firewall Status

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If you need to check the current status of the firewalld service or checking if a frewalld service is running or not in your CentOS or RHEL system, and you can use the following command:

$ sudo firewall-cmd --state

Or

$ systemctl status firewalld

outputs:

[devops@mydevops ~]$ sudo firewall-cmd --state
running
[devops@mydevops ~]$ systemctl status firewalld
firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
Active: active (running) since Tue 2019-10-08 02:53:52 EDT; 6h ago
Docs: man:firewalld(1)
Main PID: 846 (firewalld)
Tasks: 2 (limit: 8297)
Memory: 31.0M
CGroup: /system.slice/firewalld.service
└─846 /usr/libexec/platform-python -s /usr/sbin/firewalld --nofork --nopid

Oct 08 02:53:50 mydevops.com systemd[1]: Starting firewalld - dynamic firewall daemon...
Oct 08 02:53:52 mydevops.com systemd[1]: Started firewalld - dynamic firewall daemon.

If you want to check if a UFW firewall is running or not on your Ubuntu or Debian based system, and you can use the following command:

$ sudo ufw status

Outputs:

devops@devops:~$ sudo ufw status
Status: active

Stopping Firewall

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If you want to stop the firewalld service temporarily on your CentOS or RHEL Linux system, you can type the following command:

$ sudo systemctl stop firewalld

It is only valid for the current runtime session.

For Ubuntu or Debian Linux:

$ sudo ufw disable

Outputs:

devops@devops:~$ sudo ufw disable
Firewall stopped and disabled on system startup

Disabling Firewall

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If you want to disable the firewalld service or UFW in CentOS or Ubuntu system at boot time, you can use the following command:

$ sudo systemctl disable firewalld

or

$ sudo ufw disable

Outputs:

[devops@mydevops ~]$ sudo systemctl disable firewalld
Removed /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
[devops@mydevops ~]$

devops@devops:~$ sudo ufw disable
Firewall stopped and disabled on system startup

Enabling Firewall

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if you want to enable the Firewall service or UFw based firewall on your CentOS or Ubuntu Linux system, and you can type the following command at the shell prompt:

$ sudo systemctl enable firewalld

or

$ sudo ufw enable

Outputs:

[devops@mydevops ~]$ sudo systemctl enable firewalld
Created symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service → /usr/lib/systemd/system/firewalld.service.
Created symlink /etc/systemd/system/multi-user.target.wants/firewalld.service → /usr/lib/systemd/system/firewalld.service.


devops@devops:~$ sudo ufw enable
Command may disrupt existing ssh connections. Proceed with operation (y|n)? y
Firewall is active and enabled on system startup

Conclusion

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You should know that how to stop and disable the firewalld service or UFW based firewall in your CentOS or RHEL or Ubuntu Linux system.