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」

2023-10

Rocly Linux8.8_en

RockyLinux8.8 : Anti-virus(Clamav) , Mail Server

Clamav (anti-virus software)Install1.Clam AntiVirus InstallMail Server Install1. Postfix1.1 InstallInstall Postfix and build an SMTP serverMail Server : Postfix + Clamav + Amavisd+SpamAssassin1.Real-time scanning of e-mails①Amavisd ,Clamav Server install
2023.10.25
Rocly Linux8.8_en
Rocly Linux8.8_en

RockyLinux8.8 : SSL Certificate Acquisition( Let's Encrypt ) , Apache SSL , Mail SSL/TLS

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.
2023.10.25
Rocly Linux8.8_en
Rocly Linux8.8_en

RockyLinux8.8 : MySQL8 , WordPress

Mysql8 Install＃dnf module -y install mysql:8.0charset.cnf   Create a new one with the following contentsWordPress Install1. Create database for Word PressAs an example, assume database [wp_db] database user [wp_user] password [?W123456]
2023.10.25
Rocly Linux8.8_en
Rocly Linux8.8_en

RockyLinux8.8 : Snort3+Snortsnarf , Chkrootkit Install

Snort3+Snortsnarf InstallImplement Snort, a network-based IDS, in the unauthorized access detection system.SnortSnarf will also be installed to enable the unauthorized access logs extracted by Snort to be checked on a Web browser.RockyLinux8 does not have a Snort3 repository, so build, compile and install Snort3 from source codeAdvance preparation①Install required build tools and librariesInstall the EPEL repository and enable the Powertools repository.chkrootkit①Download and install chkrootkit# cd /usr/local/src# wget ftp://ftp.chkrootkit.org/pub/seg/pac/chkrootkit.tar.gz# tar xvf chkrootkit.tar.gz➁Create /root/bin directory and move chkrootkit command to that directory# mkdir -p /root/bin# mv chkrootkit-0.58b/chkrootkit /root/bin➂Check chkrootkit.
2023.10.26
Rocly Linux8.8_en
Rocly Linux8.8_en

RockyLinux8.8 : Tripwire , Logwatch , disk usage check script

Tripwire1.Install# dnf install -y tripwire2..Passphrase settingSet site passphrase and local passphraseLogwatch①Install# dnf install logwatch -y②Edit configuration fileIntroduce disk usage check script3.1  Script Creation# cd /var/www/system# vi disk_capacity_check.shContents of disk_capacity_check.sh
2023.10.27
Rocly Linux8.8_en
Rocly Linux8.8_en

RockyLinux8.8 : 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
2023.10.27
Rocly Linux8.8_en
AlmaLinux8.8_en

AlmaLinux8.8 : Anti-virus(Clamav) , Mail Server

Clamav (anti-virus software)Install1.Clam AntiVirus InstallMail Server Install1. Postfix1.1 InstallInstall Postfix and build an SMTP serverMail Server : Postfix + Clamav + Amavisd+SpamAssassin1.Real-time scanning of e-mails①Amavisd ,Clamav Server install
2023.10.31
AlmaLinux8.8_en
AlmaLinux8.8_en

AlmaLinux8.8 : 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
2023.10.31
AlmaLinux8.8_en
AlmaLinux8.8_en

AlmaLinux8.8 : FTP Server , Samba FileServer

1.FTP Server1. 1 vsftpd Install# dnf install vsftpdversion check2. Vsftpd over SSL/TLSLS2.1 Create self-signed certificatesThis work is not required if you are using a trusted, legitimate certificate such as Let's Encrypt.3. File server installation with SambaBuild a file server with access rights that requires user authentication with Samba.Installation Procedure①Create shared folders with access rights that require user authentication②Accessible group creation③Creation of users belonging to accessible groups④Configuration File Editing
2023.10.31
AlmaLinux8.8_en
AlmaLinux8.8_en

AlmaLinux8.8 : SSH connection using public key cryptography

Create a key pairCreate a public/private key pair for a user connecting to a Linux server using OpenSSH.Use ssh-keygen to create the key pair.The creation of a public/private key pair must be done as a user with remote login 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.
2023.10.31
AlmaLinux8.8_en
AlmaLinux8.8_en

AlmaLinux8.8 : SSH、firewalld 、NTP Server

1.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.1.1 Edit SSH service configuration fileModify the configuration file to change the SSH service settings.The SSH service configuration file is "/etc/ssh/sshd_config".
2023.10.31
AlmaLinux8.8_en
AlmaLinux8.8_en

AlmaLinux8.8 : Initial setup after OS installation

1.Disable 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. If you build a server while browsing a website and it does not work as expected, it may be due to the fact that selinux is enabled. Therefore, do not forget to disable it after installation.You can disable it by doing the following
2023.10.30
AlmaLinux8.8_en
AlmaLinux8.8_en

AlmaLinux8.8 : OS Install

AlmaLinux 8.8 InstallAlmaLinux OS is a project launched by US CloudLinux as an alternative to CentOS. Currently, the AlmaLinux OS Foundation is the development parent organization.This time we will install AlmaLinux 8.8, a minor upgrade on May 18, 2023.１．AlmaLinux 8.8 DownloadAlmaLinux 8.8 installation image can be downloaded from the following sitehttps://almalinux.org
2023.10.30
AlmaLinux8.8_en
Ubuntu23.04_en

Ubuntu Server23.04 : System Backup & Restore

1. System Backup1.1 Backup under /var/www/html①Create /var/www/system directory1.2 MariaDB database backup①Create db_backup.sh script under /var/www/system2. System Restore2.1 Restore backup files under HTML①Store HTML backup files used for backup in the "/ (root)" directorySelect the backup file with the latest timestamp(Example: www_back_20231009.tar.gz)2.2 Restore MariaDB database①Save DB backup file to any directory and decompress data
2023.10.09
Ubuntu23.04_en
Ubuntu23.04_en

Ubuntu Server23.04 : disk usage check script , Logwatch

1. Introduce disk usage check script1.1 Script Creation2. Log analysis tool Logwatch installed2.1 Install logwatch
2023.10.09
Ubuntu23.04_en
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