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AlmaLinux 9 ; 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.
SELinux Operation Mode
Enforcing : SELinux functionality is enabled and access control is enabled
Permissive : SElinux will warn, but no access restrictions will be placed
disabled : Both SElinux function and access control are disabled

①Current SELinux status

②Switching to [permissive] mode
③Switching to [enforcing] mode
④To completely disable SELinux, a reboot is required by adding selinux=0 to the kernel command line as follows

※ To return SELinux to active, do the following (reboot after changes)

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.

3.Services to be stopped due to security measures

4.Adding Repositories

4.1 Add EPEL repository

4.2 Add Remi's RPM repository

5.Network Settings

5.1 Check network device name

The network device name can be found as "ens160"

5.2 Host Name Change

Change the host name to Alma to try it out

5.3 Static IPv4 address configuration

The name of the network interface is "ens160" from 5.1
In Almalinux8, this could be done by rewriting the ifcfg-xxx file in network-scripts, but in Almalinux9
However, in Almalinux9, the contents of the /etc/sysconfig/network-scripts/ directory are empty and this method cannot be used, so use the "nmcli" command to change it.
Change the static IPv4 address to "192.168.11.83".

Change by "nmcli" command

5.Vim Settings

①Install Vim

②Apply and reflect Vim
③Configure Vim as a user-specific environment

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