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Rocky Linux9.4_en

Rocky Linux9.4 ; WEB Server(Apache2) & Virtual Hosts

1.Apache2 Install , Virtual Host Configuration1.1 Apache2 install①httpd install# dnf -y install httpd1.3 Virtual Host SettingsAssign and configure the domain name [rocky.korodes.com] to the document root [/var/www/html/rocky.korodes.com] directory for virtual host operation2. Use of CGI Scripts①CGI availability check3. PHP installation and configuration1.PHP8 Install4. Digest authentication with Apache2Since Basic Authentication, a well-known authentication authorization method for http, sends authentication information in plain text, there is a risk of ID and password leakage if the packet is intercepted.On the other hand, Digest Authentication encrypts and transmits authentication informa
Rocky Linux9.4_en

Rocky Linux9.4 ; Anti-virus(Clamav) , Mail Server

clamav (anti-virus software] Install1.Clam AntiVirus install# dnf -y install clamav clamd clamav-update2.Clam AntiVirus  Configuration File EditMail Server Install1. Postfix1.1 InstallInstall Postfix and build an SMTP serverMail : Postfix + Clamav + clamav-milter+SpamAssassin1.Real-time scanning of e-mails①clamav-milter InstallVirus checks are performed on the mail server side using Clam AntiVirus.The mail server and Clam AntiVirus are linked using clamav-milter.
Rocky Linux9.4_en

Rocky Linux9.4 ; MySQL8 , WordPress Install

MySQL8 Install# dnf -y install mysql-servercharset.cnf   Create a new one with the fWordPress Install1. Create database for Word PressAs an example, assume database [wp_db] database user [wp_user] password [?Ww123456]
Rocky Linux9.4_en

Rocky Linux9.4 ; Suricata , Tripwire , Chkrootkit

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 RepositoryTripwire1.Installation# dnf install -y tripwireChkrootkit①Download and install chkrootkit
Rocky Linux9.4_en

Rocky Linux9.4 ; Logwatch , Disk Usage Check Script

1. Logwatch①Install# dnf install logwatch②Edit configuration file2.Introduce disk usage check script2.1 Script Creation# cd /var/www/system# vi disk_capacity_check.sh
Rocky Linux9.4_en

Rocky Linux9.4 ; System Backup and Restore

1.Website data backup1-1.Backup under /var/www/html①Create backup script file# cd /var/www/system# vi backup_html.sh2.MySQL database backup①Create backup script file# cd /var/www/system# vi db_my_backup.sh3.Restore backup files under html①Store HTML backup files in "/ (root)" directory4.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
Rocky Linux9.3_en

Rocky Linux9.3 ; Logwatch , Disk Usage Check Script

1. Logwatch①Install# dnf install logwatch②Edit configuration file2.Introduce disk usage check script2.1 Script Creation# cd /var/www/system# vi disk_capacity_check.sh
Rocky Linux9.3_en

Rocky Linux9.3 ; SSL Certificate Acquisition( Let's Encrypt ) , Apache SSL , Mail SSL/TLS

1.Obtain an SSL certificate ( Let's Encrypt )Install the latest open ssl# dnf install openssl-devel1.1 advance preparation1.Package management system Snappy installedSince 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 just in case# 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.
Rocky Linux9.3_en

Rocky Linux9.3 ; SSH connection with public key

SSH connection with authentication using public key cryptography Creation of public and private key pairsCreate a public/private key pair for a user connecting to the Linux server using OpenSSH.Use ssh-keygen to create key pairs.Creation of public/private key pairs is performed with remote login user privileges。If you do not specify the destination and file name, id_ed25519 and id_ed25519.pub will be created in /home/(user name)/.ssh/. On the way, enter the password for the key.
Rocky Linux9.3_en

Rocky Linux9.3 ; Various settings after installation

1.Disabling SELinuxFirst, 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 operating modesEnforcing : SELinux functionality is enabled and access control is enabledPermissive : SElinux will warn, but no access restrictions will be placeddisabled : Both SElinux function and access control are disabled2.System ModernizationPackage 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.The kernel can be excluded from updates by running dnf -y update with "--exclude=kernel*" after it.
Ubuntu23.04_en

Ubuntu Server23.04 ; OS Install

Ubuntu Server 23.04 Download Installation ImageThe installation media for Ubuntu Server can be downloaded from the official site on the Internet. As long as you have a fast connection, you can download the OS itself in about 2 to 3 minutes. You will need to create an installation CD/DVD from the downloaded iso file. (approx. 2.5G)The iso file itself can be used for installation on a virtual machine using Vmware or other software.The iso file can be downloaded from the "Official Ubuntu Download Site".Ubuntu 23.04 (released on April 20, 2023) is supported until January 2024, so it is safer to install the LTS version of Ubuntu 22.04 in the production environment.
Ubuntu24.04_en

Ubuntu Server24.04 ; OS Install

Ubuntu Server 24.04 Download Installation ImageThe installation media for Ubuntu Server can be downloaded from the official site on the Internet. As long as you have a fast connection, you can download the OS itself in about 2 to 3 minutes. You will need to create an installation CD/DVD from the downloaded iso file. (approx. 2.7G)The iso file itself can be used for installation on a virtual machine using Vmware or other software.The iso file can be downloaded from the "Official Ubuntu Download Site".Ubuntu 24.04 (released on April 25, 2024) is supported until April 2029, so it is safer to install the LTS version of Ubuntu 24.04 in the production environment.
Ubuntu22.04_en

Ubuntu Server22.04 : Obtaining and Installing Images

Download Ubuntu Server 22.04 installation imageUbuntu Server installation media can be downloaded from official sites on the Internet.You will need to create an installation CD/DVD from the downloaded iso file. (approx. 1.2G)The iso file itself is available for installation on a virtual machine using Vmware or other software.The iso file can be downloaded from the "Official Ubuntu Download Site".Ubuntu Server 22.04 installedChange the BIOS so that the PC can boot from the installation disk created above.
Debian11.3 Building a server

Debian11.3 : OS Install

1.Debian11 OverviewIn this article, we will explain how to build a server with Debian, the basis of the user-friendly Linux distribution UBUNTU.The latest release is Debian 11.3 (codenamed "bullseye").Released on August 14, 2021 with an update (point release) on March 26, 2022.2.Download Debian installation imageDebian11 download site https://www.debian.org/Access the above official website and download "debian-11.3.0-amd64-netinst.iso." which is convenient for setup in an environment connected to the Internet.(Fits on a single CD)NETINST allows you to download and install the necessary packages from the Internet, so you can use a smaller installer (approximately 378 MB for v11.3.0) than a full installer.Click through the following screens in order.
Debian11.5 Building a server

Debian11.5 ; OS Install

1.Debian11 OverviewIn this article, we will explain how to build a server with Debian, the basis of the user-friendly Linux distribution UBUNTU.The latest release is Debian 11.5 (codenamed "bullseye").Released on August 14, 2021 with an update (point release11.5) on September 10, 2022.2.Download Debian installation imageDebian11 download site https://www.debian.org/Access the above official website and download "debian-11.5.0-amd64-netinst.iso." which is convenient for setup in an environment connected to the Internet.(Fits on a single CD)NETINST allows you to download and install the necessary packages from the Internet, so you can use a smaller installer (approximately 391 MB for v11.5.0) than a full installer.Click through the following screens in order.