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1. Logwatch ①Install # dnf install logwatch ②Editing Configuration Files 2.Automatic DNS update script Whenever 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 Script 3.1 script # cd /var/www/system # vi disk_capacity_check.sh

1.Website data backup 1-1. Backup under /var/www/html ①Creating backup script files # 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 4.Restoring Mysql Backup Files ①Save the backup file to any directory （In the example, the directory is "/var/www/backup/db_bak".） Unzip data

1.Website data backup 1-1. Backup under /var/www/html ①Creating backup script files # 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 4.Restoring Mysql Backup Files ①Save the backup file to any directory （In the example, the directory is "/var/www/backup/db_bak".） Unzip data

1. Logwatch ①Install # dnf install logwatch ②Editing Configuration Files 2.Automatic DNS update script Whenever 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 Script 3.1 script # cd /var/www/system # vi disk_capacity_check.sh

SNORT2 Install Snort 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-devel 1.1 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 receive 2. Converting Apache to https Install the following # dnf -y install mod_ssl 2.1 Edit ssl.conf file 3. SSL/TLS (Let's Encrypt) settings on the mail server 3.1 Obtaining a certificate for the mail server Obtain 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-update Mail Server Installation 1. Postfix 1.1 Install Install Postfix and build an SMTP server Mail server : Postfix + Clamav + Amavisd+SpamAssassin 1.Real-time scanning of e-mails ①Install Amavisd and Clamav Server

1.Setting up a remote connection via SSH 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.Firewall (Firewalld) settings In 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).

OracleLinux9.2 Oracle 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 Download Oracle Linux 9.2 installation image (OracleLinux-R9-U2-x86_64-dvd.iso ) can be downloaded from the following site https://www.oracle.com/linux/

 Suricata SURICATA 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 preparation ①Activate the EPEL Repository SNORT Snort 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 backup 1-1.Backup under /var/www/html ①Create backup script file 2.MySQL database backup ①Create backup script file # cd /var/www/system # vi db_my_backup.sh 3.Restore backup files under html ① 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 date 4.Restore Mysql backup file ①Save 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 backup 1-1.Backup under /var/www/html ①Create backup script file 2.MySQL database backup ①Create backup script file # cd /var/www/system # vi db_my_backup.sh 3.Restore backup files under html ① 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 date 4.Restore Mysql backup file ①Save 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

 Suricata SURICATA 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 preparation ①Activate the EPEL Repository SNORT Snort 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-server Create a new charset.cnf with the following contents WordPress Install 1. Create database for Word Press As 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-devel 1.1 advance preparation 1.Package management system Snappy installation Since 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 https Install the following # dnf -y install mod_ssl 3. SSL/TLS (Let's Encrypt) settings on the mail server 3.1 Obtaining a certificate for the mail server Obtain 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.