How to turn off the firewall and selinux in linux

Firewall and SELinux can be turned off in Linux via the command line or GUI. How to turn off the firewall: Execute sudo systemctl stop firewalld and sudo systemctl disable firewalld in the command line, or turn its switch to "off" in the GUI. To turn off SELinux: execute sudo setenforce 0 from the command line or select it as "disabled" in the GUI. Turning off the firewall or SELinux will reduce system security and should only be done when clearly necessary.

How to turn off the firewall and SELinux in Linux

Firewall

• Use the command line to turn off the firewall:

  <code class="bash">sudo systemctl stop firewalld
  sudo systemctl disable firewalld</code>

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• Use the GUI (Graphical User Interface):

  • In Ubuntu, open System Settings -> Firewall-> Turn the switch to "Off".
  • In CentOS, open System Settings -> Firewall -> select "Disabled".

SELinux

• Turn off SELinux using the command line:

  <code class="bash">sudo setenforce 0
  # 或者，将 /etc/selinux/config 中的 SELINUX=enforcing 更改为 SELINUX=disabled</code>

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• Using GUI:

  • In Ubuntu, open System Settings-> Security and Privacy-> SELinux-> Select "Disabled".
  • In CentOS, open System Settings -> SELinux -> Select "Disabled".

Note:

• Turning off the firewall or SELinux will reduce the security of the system. Only do this if clearly needed.
• After restarting the system, SELinux settings will be reset to default values. To permanently disable SELinux, edit the /etc/selinux/config file and change SELINUX=enforcing to SELINUX=disabled.

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