Click here for "Error Codes for Commercial Air Conditioners".(Japanese Version)

2023-08

FreeBSD13.2_en

FreeBSD13.2 ; Postfix ClamAV + Amavis + SpamassAssin

Install ClamAV on FreeBSD 13 and link it with Amavis against Postfix.ClamAV is anti-virus software.We will proceed on the assumption that you have already implemented Postfix.Before proceeding, update the Ports Collection.
2023.08.01
FreeBSD13.2_en
OracleLinux 8.8_en

OracleLinux8.8 ; WEB Server (Apache)

1.Apache2 Install , Virtual Host Configuration1.1 Apache2 install2. Use of CGI Scripts①CGI availability check3. PHP installation and configuration4. 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 information, so there is almost no risk of information leakage.
2023.08.18
OracleLinux 8.8_en
OracleLinux 8.8_en

OracleLinux8.8 ; FTP Server , Samba FileServer

1.FTP Server1.1vsftpd Install# dnf -y install vsftpd1.2vsftpd configurationSave the unedited vsftpd.conf with .bak# cp /etc/vsftpd/vsftpd.conf /home/huong/vsftpd.conf.bak2. vsftpd SSL/TLSConfigure Vsftpd to use SSL/TLS2.1 Create self-signed certificatesThis work is not required if you are using a trusted, legitimate certificate such as Let's Encryp3. 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 Edit
2023.08.18
OracleLinux 8.8_en
OracleLinux 8.8_en

OracleLinux8.8 ; SSH connection with SSH key pair

SSH connection with authentication using public key 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.
2023.08.18
OracleLinux 8.8_en
OracleLinux 8.8_en

OracleLinux8.8 ; SSH Remote connection , Firewalld , NTP Server

1.Setting up a 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.2.Firewall (Firewalld) settingsIn Oracle, the firewall is firewalld configured by default and enabled during OS installation.To briefly explain "firewalld," when setting communication control policies, communication permission/blocking rules are applied to predefined zones, and these zones are then assigned to each NIC (network adapter).
2023.08.18
OracleLinux 8.8_en
OracleLinux 8.8_en

OracleLinux8.8 ; Initial settings after OS installation

1.Install bash completion extension package# dnf -y install bash-completion# reboot2.Disabling SELinuxFirst, 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 contents of the configuration considerably.Therefore, it is basically a case of invalidation 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 disabled
2023.08.18
OracleLinux 8.8_en
OracleLinux9.2-en

OracleLinux9.2 ; Tripwire , Chkrootkit , Logwatch , Disk Usage Check Script

Tripwire1.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.rpmChkrootkit①Download 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.gzLogwatch①Install# dnf install logwatchIntroduce disk usage check script1. Script Creation# cd /var/www/system# vi disk_capacity_check.sh
2023.08.15
OracleLinux9.2-en
OracleLinux9.2-en

OracleLinux9.2 ; MySQL8 , WordPress Install

Mysql8 Install＃ dnf -y install mysql-serverCreate a new charset.cnf with the following contentsWordPress Install1. Create database for Word PressAs an example, assume database [wp_db] database user [wp_user] password [?W123456]
2023.08.14
OracleLinux9.2-en
OracleLinux9.2-en

OracleLinux9.2 ; WEB Server (Apache)

1.Apache2 installation and virtual host configuration1.1 Apache2①httpd install# dnf -y install httpd1.3 Virtual Host SettingsAssign and configure the domain name [oracle.korodes.com] to the document root [/var/www/html/oracle.korodes.com] directory for virtual host operation# vi /etc/httpd/conf.d/vhost.conf2. Confirmation of CGI Script Usage①Confirmation of CGI availability3. PHP installation and configuration1.PHP install①Install
2023.08.13
OracleLinux9.2-en
OracleLinux9.2-en

OracleLinux9.2 ; FTP Server , Samba FileServer Install

1.FTP Server1.1vsftpd Install# dnf -y install vsftpd1.2vsftpd configurationSave the unedited vsftpd.conf with .bak# cp /etc/vsftpd/vsftpd.conf /home/huong/vsftpd.conf.bak2. vsftpd SSL/TLSConfigure Vsftpd to use SSL/TLS2.1 Create self-signed certificatesThis work is not required if you are using a trusted, legitimate certificate such as Let's Encryp3. 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 Edit
2023.08.12
OracleLinux9.2-en
OracleLinux9.2-en

OracleLinux9.2 ; SSH connection with SSH key pair

SSH connection with authentication using public key 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.
2023.08.12
OracleLinux9.2-en
OracleLinux9.2-en

OracleLinux9.2 ; Initial settings after OS installation

1.Install bash completion extension package# dnf -y install bash-completion# reboot2.Disabling SELinuxFirst, 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 contents of the configuration considerably.Therefore, it is basically a case of invalidation 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 disabled
2023.08.12
OracleLinux9.2-en
FreeBSD13.2_en

FreeBSD13.2 ; OS INSTALL

FreeBSDFreeBSD is UNIX-like open source OS software. In particular, its performance as a network operating system exceeds that of Linux-based systems, and it maintains stable performance even under high loads.FreeBSD is designed to be robust and sturdy with an emphasis on practicality, making it suitable for operating FTP, WWW, and e-mail servers for major companies and services.In this project, we will install FreeBSD 13.2, released on April 11, 2023, and build the server.FeaturesHigh-speed, high-performance multi-platform capable of withstanding high workloadsAdopted by many major companiesNetwork security measures can be applied by restricting accessCapable of operating small to large serversMore than 33,000 dedicated software applications from commercial to personal useInstall1.Download Installation ImageGo to the FreeBSD distribution site (https://www.freebsd.org/where/) and select amd64
2023.08.02
FreeBSD13.2_en
OracleLinux 8.8_en

OracleLinux8.8 ; SNORT3 , Tripwire , Chkrootkit

SNORT3 InstallSnort is an open source network intrusion detection system capable of performing real-time traffic analysis and packet logging on IP networks.It can perform "protocol analysis," "content search," and "matching," and can be used to detect a variety of attacks, including "buffer overflows," "stealth port scans," "CGI attacks," "SMB probes," "OS fingerprinting attempts," "semantic URL attacks," and "server message block probes.
2023.08.19
OracleLinux 8.8_en
OracleLinux9.2-en

OracleLinux9.2 ; SSL Certificate Acquisition( Let's Encrypt ) , WEB/Mail server SSL

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.
2023.08.14
OracleLinux9.2-en
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