業務用エアコン関連の技術情報、エラーコード、環境問題対策に関する別サイト「エアコンの安全な修理・適切なフロン回収」

2024-08

Almalinux9.4_en

AlmaLinux9.4 : 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
Almalinux9.4_en

AlmaLinux9.4 : 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.
Almalinux9.4_en

AlmaLinux9.4 : SSH、Firewalld、NTP Server

1. SSH remote connectionSSH 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.
OracleLinux9.4_en

OracleLinux9.4 : OS INSTALL 、Initialization

OracleLinux9.4Oracle 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.We will proceed with the latest Oracle Linux 9.4 (released May 15, 2024).1.Oracle Linux9.4 DownloadDownload the Oracle Linux 9.4 installation image (OracleLinux-R9-U4-x86_64-dvd.iso ) from the following sitehttps://yum.oracle.com/oracle-linux-isos.html2.Oracle Linux 9.4 InstallInstall USB media, change BIOS settings to boot from USB media, and install.