AlmaLinux 9.1 ; Various settings after installation
1.Disabling SELinux First, disable selinux. selinux is a feature that improves auditing and security in Linux, but when enabled, it places considerable restrictions on the behavior of services and on what can be configured. Therefore, it is basically disabled in many cases. ①Disable SELinux while it is activated but no policy is loaded 2.Modernize the system Package updates are performed as soon as possible immediately after OS installation. However, when a dnf update is performed, a kernel update is also performed at the same time. Performing a kernel update may require rebooting the system or stopping services, or worse, a kernel panic may occur and the system may not boot. It is wiser to exclude the kernel from the update. By running dnf -y update with "--exclude=kernel*" behind it kernel can be excluded from the update target.