Click here for "Error Codes for Commercial Air Conditioners".

2022-11

Almalinux9.1_en

AlmaLinux 9.1 ; OS Install

AlmaLinux 9.0 Install AlmaLinux OS is a project launched by CloudLinux in the US as an alternative to CentOS. Currently, the AlmaLinux OS Foundation is the development parent organization.Following the general availability of Red Hat Enterprise Linux 9.0, AlmaLinux 9.0 was released on May 26, 2022. Like Red Hat Enterprise Linux 9, AlmaLinux 9 utilizes the same package versions as the Linux 5.14 kernel, GCC 11, Python 3.9, and RHEL9. Cockpit web management interface, enhanced kernel live patching, improved container and cloud integration, OpenSSL 3, and other security improvements.
2022.11.22
Almalinux9.1_en
Rocky Linux9.1_en

RockyLinux9.1 : OS Install

Rocky Linux9.0 The Rocky Release Engineering team announced the latest version of Rocky Linux 9.0 on July 14, 2022. Rocky Linux is a Linux distribution compatible with Red Hat Enterprise Linux; Rocky Linux 9 is a compatible release with RHEL 9 released in May and will be supported until the end of May 2032. In security, password-based root user authentication via SSH is now disabled by default. SSH keys can be used to access remote systems instead of root passwords. OpenSSL supports version 3.0.1, enhanced support for HTTPS clients, and a new FIPS module.
2022.11.08
Rocky Linux9.1_en
fedora37_en

Fedora37 ; WEB Server(Apache2)

Apache2 installation and virtual host configuration 1.Apache...
2022.11.28
fedora37_en
Rocky Linux9.1_en

RockyLinux 9.1 ; WEB Server(Apache2) Install & Virtual Hosts

1.Apache2 Install , Virtual Host Configuration 1.1 Apache2 install ①httpd install # dnf -y install httpd 1.3 Virtual Host Settings Assign and configure the domain name [rocky.korodes.com] to the document root [/var/www/html/rocky.korodes.com] directory for virtual host operation 2. Use of CGI Scripts ①CGI availability check 3. PHP installation and configuration 1.PHP8 Install 4. Digest authentication with Apache2 Since 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
2022.11.15
Rocky Linux9.1_en
Rocky Linux9.1_en

RockyLinux 9.1 ; Anti-virus(Clamav) , Mail Server

clamav (anti-virus software] Install 1.Clam AntiVirus install # dnf -y install clamav clamd clamav-update 2.Clam AntiVirus  Configuration File Edit Mail Server Install 1. Postfix 1.1 Install Install Postfix and build an SMTP server
2022.11.10
Rocky Linux9.1_en
fedora37_en

Fedora37 ; FTP Server(Vsftpd) , File Server(Samba)

1.FTP Server Installation 1. 1 vsftpd Install 2. vsftpd SSL/TLS Configure Vsftpd to use SSL/TLS 2.1 Create self-signed certificates This work is not required if you are using a trusted, legitimate certificate such as Let's Encrypt. 3. File server installation with Samba Build a file server with access rights that requires user authentication with Samba. Installation Procedure ① Create shared folders with access rights that require user authentication ②Creation of accessible groups ③Creation of users belonging to groups that can be accessed ④Configuration File Editing
2022.11.28
fedora37_en
fedora37_en

Fedora37 ; Remote connection with SSH public key cryptography

1.Creation of public and private key pairs Create 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 is performed with the authority of the user logging in remotely. If you do not specify the creation destination and file name, id_ed25519 and id_ed25519.pub will be created in /home/(user name)/.ssh/. On the way, also enter the password for the key.
2022.11.28
fedora37_en
fedora37_en

Fedora37 ; Various settings after installation

1. SELinux Disable First, disable selinux. selinux is a feature that improves auditing and security in Linux, but when enabled, it can limit the behavior of services and the configuration considerably. Therefore, it is basically invalidated in many cases. You can disable it by doing the following。
2022.11.27
fedora37_en
fedora37_en

Fedora37 ; OS INSTALL

Fedora ; Download Fedora37 can be downloaded from the following mirror sites http://ftp.riken.jp/Linux/fedora/releases/37/Server/x86_64/iso/ The file to download is the "Fedora-Server-netinst-x86_64-37-1.7.iso" image Create an installation disk from the downloaded "Fedora-Server-netinst-x86_64-37-1.7.iso" image on a USB disk and install it on the actual device.
2022.11.27
fedora37_en
fedora37_en

Fedora37 ; SSH 、Firewalld

1.Remote connection by SSH SSH is a service for connecting r...
2022.11.28
fedora37_en
Rocky Linux9.1_en

RockyLinux 9.1 ; System Backup and Restore

1.Website data backup 1-1.Backup under /var/www/html ①Create backup script file # cd /var/www/system # vi backup_html.sh 2.MySQL database backup ①Create backup script file # cd /var/www/system # vi db_my_backup.sh 3.Restore backup files under html ①Store HTML backup files in "/ (root)" directory 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
2022.11.11
Rocky Linux9.1_en
Rocky Linux9.1_en

RockyLinux 9.1 ; Suricata , Tripwire , Chkrootkit

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 # dnf -y install epel-release Tripwire 1.Download and installation # cd /usr/local/src # wget https://rpmfind.net/linux/epel/9/Everything/x86_64/Packages/t/tripwire-2.4.3.7-13.el9.x86_64.rpm # rpm -Uvh tripwire-2.4.3.7-13.el9.x86_64.rpm Chkrootkit ①Download and install chkrootkit # cd /usr/local/src # wget https://launchpad.net/chkrootkit/main/0.55/+download/chkrootkit-0.55.tar.gz # tar xvf chkrootkit-0.55.tar.gz
2022.11.11
Rocky Linux9.1_en
Rocky Linux9.1_en

RockyLinux 9.1 ; MySQL8 , WordPress Install

Mysql8 Install ＃ dnf -y install mysql-server charset.cnf   Create a new one 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]
2022.11.10
Rocky Linux9.1_en
Rocky Linux9.1_en

RockyLinux 9.1 ; 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-devel 1.1 advance preparation 1.Package management system Snappy installed 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 just in case # 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.
2022.11.10
Rocky Linux9.1_en
Rocky Linux9.1_en

RockyLinux 9.1 ; FTP Server , Samba File Server

1.FTP Server 1. 1 Vsftpd Install # dnf -y install vsftpd 1.2 Configure Vsftpd Save the unedited vsftpd.conf with .bak 3. File server installation with Samba Build a file server with access rights that requires user authentication with Samba. Installation Procedure ①Create shared folders with access rights that require user authentication ②Accessible group creation ③Creation of users belonging to accessible groups ④Configuration File Editing
2022.11.09
Rocky Linux9.1_en
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