AlmaLinux8.8_en

AlmaLinux 8.8 Install AlmaLinux 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 Download AlmaLinux 8.8 installation image can be downloaded from the following site https://almalinux.org

Create a key pair 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 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.

Snort3+Snortsnarf Install Implement 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. AlmaLinux8 does not have a Snort3 repository, so build, compile and install Snort3 from source code Advance preparation ①Install required build tools and libraries Install the EPEL repository and enable the Powertools repository. chkrootkit ①Download and install chkrootkit # cd /usr/local/src # wget ftp://ftp.chkrootkit.org/pub/seg/pac/chkrootkit.tar.gz # tar xvf chkrootkit.tar.gz ➁Create /root/bin directory and move chkrootkit command to that directory # mkdir -p /root/bin # mv chkrootkit-0.58b/chkrootkit /root/bin ➂Check chkrootkit.

1.Disable SELinux First, 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

1.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. 1.1 Edit SSH service configuration file Modify the configuration file to change the SSH service settings. The SSH service configuration file is "/etc/ssh/sshd_config".

1.FTP Server 1. 1 vsftpd Install # dnf install vsftpd version check 2. Vsftpd over SSL/TLSLS 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 ①Create shared folders with access rights that require user authentication ②Accessible group creation ③Creation of users belonging to accessible groups ④Configuration File Editing

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

Clamav (anti-virus software)Install 1.Clam AntiVirus Install Mail Server Install 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 ①Amavisd ,Clamav Server install

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.

Mysql8 Install ＃dnf module -y install mysql:8.0 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]

Tripwire 1.Install # dnf install -y tripwire 2..Passphrase setting Set site passphrase and local passphrase Logwatch ①Install # dnf install logwatch -y ②Edit configuration file Introduce disk usage check script 3.1  Script Creation # cd /var/www/system # vi disk_capacity_check.sh Contents of disk_capacity_check.sh

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