Disabling the Firewall and SELinux

In the test environment, the firewall is disabled to avoid the network impact. Configure the firewall based on your requirements.
SELinux may restrict the access permission of applications. Therefore, disable SELinux to ensure that applications run properly.
Disabling SELinux may impair system security and make the system more vulnerable to potential security problems and attacks. Assess the potential risks before disabling SELinux.

Disable the firewall:

        
             systemctl stop firewalld.service
systemctl disable firewalld.service

Disable SELinux.

Disable SELinux temporarily (becoming invalid after a server reboot).
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setenforce 0

Disable SELinux permanently (requiring a server reboot to take effect).

Modify the configuration file to disable SELinux.

            
                 sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
cat /etc/selinux/config

If "SELINUX=disabled" is displayed, as shown in the following figure, the modification is successful.

Parent topic: OS Tuning