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1. Logwatch①Install# dnf install logwatch②Editing Configuration Files2.Automatic DNS update scriptWhenever the global IP changes, which happens when the network is disconnected or the router is disconnected and rebooted, we need to access Dynamic DNS to inform the user that the global IP has changed. We will install a script that will do this automatically.This time, we assume that you will use Value Domain as your DNS service.3.Disk Usage Check Script3.1 script# cd /var/www/system# vi disk_capacity_check.sh

1.Website data backup1-1. Backup under /var/www/html①Creating backup script files# cd /var/www/system# vi backup_html.sh2.MySQL database backup①Creating backup script files# cd /var/www/system3.Restore backup files under html① Store HTML backup files in "/ (root)" directory4.Restoring Mysql Backup Files①Save the backup file to any directory（In the example, the directory is "/var/www/backup/db_bak".）Unzip data

1.Website data backup1-1. Backup under /var/www/html①Creating backup script files# cd /var/www/system# vi backup_html.sh2.MySQL database backup①Creating backup script files# cd /var/www/system3.Restore backup files under html① Store HTML backup files in "/ (root)" directory4.Restoring Mysql Backup Files①Save the backup file to any directory（In the example, the directory is "/var/www/backup/db_bak".）Unzip data

1. Logwatch①Install# dnf install logwatch②Editing Configuration Files2.Automatic DNS update scriptWhenever the global IP changes, which happens when the network is disconnected or the router is disconnected and rebooted, we need to access Dynamic DNS to inform the user that the global IP has changed. We will install a script that will do this automatically.This time, we assume that you will use Value Domain as your DNS service.3.Disk Usage Check Script3.1 script# cd /var/www/system# vi disk_capacity_check.sh

SNORT2 InstallSnort is an open source network intrusion detection system capable of performing real-time traffic analysis and packet logging on IP networks.It can perform "protocol analysis," "content search," and "matching," and can be used to detect a variety of attacks, including "buffer overflows," "stealth port scans," "CGI attacks," "SMB probes," "OS fingerprinting attempts," "semantic URL attacks," and "server message block probes.

1.Obtain SSL Certificate ( Let's Encrypt )Install the latest open ssl# dnf install openssl-devel1.1 Certificate Installation# dnf -y install certbot# certbot certonly --webroot -w /var/www/html/[FQDN] -d [FQDN]# Registration of e-mail address and agreement to terms of use are required for the first time only.# Specify an email address to receive2. Converting Apache to httpsInstall the following# dnf -y install mod_ssl2.1 Edit ssl.conf file3. SSL/TLS (Let's Encrypt) settings on the mail server3.1 Obtaining a certificate for the mail serverObtain a certificate for the mail server, but it cannot be obtained in the same way as above, so the following with the "--standalone" option fails.

Clamav(anti-virus)1.Clam AntiVirus install# dnf -y install clamav clamd clamav-updateMail Server Installation1. Postfix1.1 InstallInstall Postfix and build an SMTP serverMail server : Postfix + Clamav + Amavisd+SpamAssassin1.Real-time scanning of e-mails①Install Amavisd and Clamav Server

1.Setting up a remote connection via SSHSSH 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.Firewall (Firewalld) settingsIn Oracle, the firewall is firewalld configured by default and enabled during OS installation.To briefly explain "firewalld," when setting communication control policies, communication permission/blocking rules are applied to predefined zones, and these zones are then assigned to each NIC (network adapter).

OracleLinux9.2Oracle Linux provides a 100% application binary compatible alternative to Red Hat Enterprise Linux and CentOS Linux for both hybrid and multi-cloud environments.Since 2006, Oracle Linux has been completely free to download and use. Source code, binaries and updates are provided free of charge. It is freely redistributable. Free for use in production environments.今回は、最新のOracle Linux9.2(2023年5月リリース)で進めていきます。This time, we will proceed with the latest Oracle Linux 9.1.(May 2023 Release)１．Oracle Linux9.2 DownloadOracle Linux 9.2 installation image (OracleLinux-R9-U2-x86_64-dvd.iso ) can be downloaded from the following sitehttps://www.oracle.com/linux/

 SuricataSURICATA IDS/IPS is an open source IDS that monitors communications on the network and detects suspicious traffic.The basic mechanism is signature-based, so it can detect predefined unauthorized communications. Suricata is also characterized by its ability to provide protection as well as detection.1.advance preparation①Activate the EPEL RepositorySNORTSnort is an open source network intrusion detection system that can perform real-time traffic analysis and packet logging on IP networks.It can perform "protocol analysis," "content search," and "matching" and can be used to detect a variety of attacks such as buffer overflows, stealth port scans, CGI attacks, SMB probes, OS fingerprinting attempts, semantic URL attacks, and server message block probes. detection.

1.Website data backup1-1.Backup under /var/www/html①Create backup script file2.MySQL database backup①Create backup script file# cd /var/www/system# vi db_my_backup.sh3.Restore backup files under html① Store HTML backup files in "/ (root)" directory# cd /var/www/backup/html_bak# cp html_back_20220610.tar.gz / ←Specify the backup file with the latest date4.Restore Mysql backup file①Save the database backup file to any directory and（In the example, the directory is "/var/www/backup/db_bak".）Extracting data# cd /var/www/backup/db_bak

1.Website data backup1-1.Backup under /var/www/html①Create backup script file2.MySQL database backup①Create backup script file# cd /var/www/system# vi db_my_backup.sh3.Restore backup files under html① Store HTML backup files in "/ (root)" directory# cd /var/www/backup/html_bak# cp html_back_20220610.tar.gz / ←Specify the backup file with the latest date4.Restore Mysql backup file①Save the database backup file to any directory and（In the example, the directory is "/var/www/backup/db_bak".）Extracting data# cd /var/www/backup/db_bak

 SuricataSURICATA IDS/IPS is an open source IDS that monitors communications on the network and detects suspicious traffic.The basic mechanism is signature-based, so it can detect predefined unauthorized communications. Suricata is also characterized by its ability to provide protection as well as detection.1.advance preparation①Activate the EPEL RepositorySNORTSnort is an open source network intrusion detection system that can perform real-time traffic analysis and packet logging on IP networks.It can perform "protocol analysis," "content search," and "matching" and can be used to detect a variety of attacks such as buffer overflows, stealth port scans, CGI attacks, SMB probes, OS fingerprinting attempts, semantic URL attacks, and server message block probes. detection.

Mysql8 Install＃ dnf -y install mysql-serverCreate a new charset.cnf with the following contentsWordPress Install1. Create database for Word PressAs an example, assume database [wp_db] database user [wp_user] password [?W123456]

1.SSL Certificate Acquisition ( Let's Encrypt )Install the latest open ssl# dnf install openssl-devel1.1 advance preparation1.Package management system Snappy installationSince the SSL certificate issuing tool "certbot" of Let's Encrypt is recommended to be installed using "snap" after 2021, install Snapd first.(Can also be installed the traditional way with dnf or yum)2. Converting Apache to httpsInstall the following# dnf -y install mod_ssl3. SSL/TLS (Let's Encrypt) settings on the mail server3.1 Obtaining a certificate for the mail serverObtain a certificate for the mail server, but it cannot be obtained in the same way as above, so the following with the "--standalone" option fails.