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OracleLinux9.2-en

OracleLinux9.2-en

OracleLinux9.2 ; Initial settings after OS installation

1.Install bash completion extension package # dnf -y install bash-completion # reboot 2.Disabling SELinux 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 contents of the configuration considerably. Therefore, it is basically a case of invalidation in many cases. SELinux operating modes Enforcing : SELinux functionality is enabled and access control is enabled Permissive : SElinux will warn, but no access restrictions will be placed disabled : Both SElinux function and access control are disabled
OracleLinux9.2-en

OracleLinux9.2 ; WEB Server (Apache)

1.Apache2 installation and virtual host configuration 1.1 Apache2 ①httpd install # dnf -y install httpd 1.3 Virtual Host Settings Assign 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.conf 2. Confirmation of CGI Script Usage ①Confirmation of CGI availability 3. PHP installation and configuration 1.PHP install ①Install
OracleLinux9.2-en

OracleLinux9.2 ; MySQL8 , WordPress Install

Mysql8 Install # dnf -y install mysql-server Create a new charset.cnf 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]
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-devel 1.1 advance preparation 1.Package management system Snappy installation 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 # 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.
OracleLinux9.2-en

OracleLinux9.2 ; Clamav(anti-virus) , Mail Server

Clamav(anti-virus) 1.Clam AntiVirus install # dnf -y install clamav clamd clamav-update Mail Server Installation 1. Postfix 1.1 Install Install Postfix and build an SMTP server Mail server : Postfix + Clamav + Amavisd+SpamAssassin 1.Real-time scanning of e-mails ①Install Amavisd and Clamav Server
OracleLinux9.2-en

OracleLinux9.2 ; SSH connection with SSH key pair

SSH connection with authentication using public key  Creation of public and private key pairs Create 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.
OracleLinux9.2-en

OracleLinux9.2 ; SSH Remote connection , Firewalld , NTP Server

1.Setting up a remote connection via SSH SSH 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) settings In 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).
OracleLinux9.2-en

OracleLinux9.2 ; OS Install

OracleLinux9.2 Oracle 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. 今回は、最新のOracle Linux9.2(2023年5月リリース)で進めていきます。This time, we will proceed with the latest Oracle Linux 9.1.(May 2023 Release) 1.Oracle Linux9.2 Download Oracle Linux 9.2 installation image (OracleLinux-R9-U2-x86_64-dvd.iso ) can be downloaded from the following site https://www.oracle.com/linux/
OracleLinux9.2-en

OracleLinux9.2 ; FTP Server , Samba FileServer Install

1.FTP Server 1.1vsftpd Install # dnf -y install vsftpd 1.2vsftpd configuration Save the unedited vsftpd.conf with .bak # cp /etc/vsftpd/vsftpd.conf /home/huong/vsftpd.conf.bak 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 Encryp 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 Edit
OracleLinux9.2-en

OracleLinux9.2 ; Suricata , SNORT Install

 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 SNORT Snort is an open source network intrusion detection system that can perform 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 such as buffer overflows, stealth port scans, CGI attacks, SMB probes, OS fingerprinting attempts, semantic URL attacks, and server message block probes. detection.
OracleLinux9.2-en

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

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 Logwatch ①Install # dnf install logwatch Introduce disk usage check script 1. Script Creation # cd /var/www/system # vi disk_capacity_check.sh
OracleLinux9.2-en

OracleLinux9.2 ; System Backup and Restore

1.Website data backup 1-1.Backup under /var/www/html ①Create backup script file 2.MySQL database backup ①Create backup script file # cd /var/www/system # vi db_my_backup.sh 3.Restore backup files under html ① Store HTML backup files in "/ (root)" directory # cd /var/www/backup/html_bak # cp html_back_20220610.tar.gz / ←Specify the backup file with the latest date 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 # cd /var/www/backup/db_bak