nuy

1. SELinux Disable First, disable selinux. selinux is a feature that improves auditing and security in Linux, but when enabled, it can limit the behavior of services and the configuration considerably. Therefore, it is basically disabled in many cases. To disable SELinux, a reboot is required by adding selinux=0 to the kernel command line as follows 2. System Modernization 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. 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.

1. Setting up SSH remote connection SSH is a service for connecting remotely to a server and is basically running immediately after the OS is installed, but the default settings are somewhat insecure. Here we will configure the default settings to increase the security of ssh connections. 2. How to set up a firewall (firewalld) In AlmaLinux, the firewall is set to firewalld by default and is enabled during OS installation. Briefly explaining "firewalld," when setting communication control policies, the method is to apply communication permission/blocking rules to predefined zones, and then assign those zones to each NIC (network adapter). 4. NTP Server Settings Synchronize server time with Japan Standard Time ① Chrony Installation and Configuration

Install clamav ( anti-virus software ) 1.Clam AntiVirus Install # dnf -y install clamav clamd clamav-update 2.Clam AntiVirus  Configuration File Editing Mail Server Installation 1.Postfix Installation 1.1 Install Install Postfix and build an SMTP server # dnf -y install postfix Mail Server : Postfix + Clamav + Amavisd+SpamAssassin 1.Real-time scanning of e-mails ①Amavisd & Clamav Server  Install

Mysql8  Install ＃ dnf module -y install mysql:8.0 ＃ vi /etc/my.cnf.d/charset.cnf charset.cnf    Create a new one with the following contents WordPress  Install 1. Create a database for WordPress As an example, assume database [wp_db] database user [wp_user] password [?W123456] # mysql -u root -p

1. Website data backup 1-1. Backup under /var/www/html ①Create backup script file # cd /var/www/system # vi backup_html.sh 2. MySQL database backup ①Creating backup script files # cd /var/www/system 3.Restore backup files under html ① Store HTML backup files in "/" (root) directory # cd /var/www/backup/html_bak 4. Restore Mysql Backup Files ①Save the database backup file to any directory （In the example, the directory is "/var/www/backup/db_bak".） Unzip data