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

RockyLinux8.8 ; SSH connection using public key cryptography

SSH public key cipher setting1.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.
2023.10.25
Rocly Linux8.8_en
MiracleLinux9.2_en

MiracleLinux9.2 ; Clamav( anti-virus ) , Mail Server

Clamav (anti-virus software)Install1.Clamav install# dnf -y install clamav clamd clamav-update2.Clam AntiVirus  Configuration File EditMail Server Install1. Postfix1.1 InstallInstall Postfix and build an SMTP server2.Dovecot2.1 dovecot install# dnf -y install dovecot2.2 Edit dovecot.conf fileMail Server : Postfix + Clamav + Amavisd+SpamAssassin1.Real-time scanning of e-mails①Install Amavisd and Clamav Server
2023.10.20
MiracleLinux9.2_en
MiracleLinux8.8_en

MiracleLinux8.8 ; 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
2023.10.14
MiracleLinux8.8_en
Rocly Linux8.8_en

RockyLinux8.8 ; 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
2023.10.24
Rocly Linux8.8_en
Rocly Linux8.8_en

RockyLinux8.8 ; 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".2.Firewall (firewalld) settingsThe firewall is set to firewalld as default and is enabled during OS installation.2.1 How to use the "firewall-cmd" command to control "firewalld1)Command to check the status and settings of "firewalld"
2023.10.24
Rocly Linux8.8_en
Rocly Linux8.8_en

RockyLinux8.8 ; FTP Server , Samba FileServer Install

2. 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
2023.10.25
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 ; 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
MiracleLinux9.2_en

MiracleLinux9.2 ; Chkrootkit Logwatch 

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.Logwatch①Install # dnf install logwatch②Edit configuration file
2023.10.21
MiracleLinux9.2_en
MiracleLinux9.2_en

MiracleLinux9.2 ; WEB Server(Apache2) Install 

1.Apache2 Install , Virtual Host Configuration1.1 Apache2 install①httpd install# dnf -y install httpd1.3 Virtual Host SettingsAssign and configure the domain name [miracle.korodes.com] to the document root [/var/www/html/miracle.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
2023.10.20
MiracleLinux9.2_en
MiracleLinux9.2_en

MiracleLinux9.2 ; OS Install

MiracleLinuxMIRACLE LINUX is a Japanese Linux distribution provided by Cybertrust Corporation. It has been based on RHEL since Version 2.0 released in May 2001, and has been a complete RHEL clone since Version 6.0 released in January 2012. The latest version is 9.2, released on October 05, 2023, but can be installed just like 9.0.MIRACLE LINUX, a well-known domestic RHEL clone, was initially a commercial OS with a paid license, but following the demise of CnetOS8, it was announced that it would be offered free of charge starting with the latest 8.4. Therefore, MIRACLE LINUX is currently in the limelight as a candidate for migration from CentOS8 and CentOS Stream9.
2023.10.19
MiracleLinux9.2_en
MiracleLinux9.2_en

MiracleLinux9.2 ; SSH , Firewalld , NTP Server

1.Setting up SSH remote connectionSSH is a service to connect to a server remotely, and is basically running right after the OS installation, but the default settings are somewhat insecure.In this section, we will configure the settings to change the default settings and increase the security of the ssh connection.1.1 Change the configuration file of SSH service.The configuration file for the SSH service is "/etc/ssh/sshd_config". Open the configuration file with vi editor
2023.10.19
MiracleLinux9.2_en
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