OracleLinux 8.8_en

SNORT3 Install Snort 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.

1.Apache2 Install , Virtual Host Configuration 1.1 Apache2 install 2. Use of CGI Scripts ①CGI availability check 3. PHP installation and configuration 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 information, so there is almost no risk of information leakage.

What is Icinga2? It is an open source software for system monitoring, derived and developed from a monitoring software called Nagios. In this article, we will install the Icinga2 monitoring application on OracleLinux8.x with RHEL8. The same can be done on Rocky Linux8.x and AlmaLinux8.x. However, please note that some information related to PowerTools is different from the information on this page. 1.Prerequisite. The requirement for installing Icinga2 is that you must have LAMP installed. PHP 7.3 or later version is also required. In this case, it is assumed that the following have been built MySQL 　　Ver 8.0.32 PHP　　　　7.4.33 Httpd　　　Apache/2.4.37 SELINUX   permissive

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/

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

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).

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.

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

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

1.Obtain SSL Certificate ( Let's Encrypt ) Install the latest open ssl # dnf install openssl-devel 1.1 Certificate Installation # dnf -y install certbot # certbot certonly --webroot -w /var/www/html/[FQDN] -d [FQDN] # Registration of e-mail address and agreement to terms of use are required for the first time only. # Specify an email address to receive 2. Converting Apache to https Install the following # dnf -y install mod_ssl 2.1 Edit ssl.conf file 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 -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]

1. Logwatch ①Install # dnf install logwatch ②Editing Configuration Files 2.Automatic DNS update script Whenever the global IP changes, which happens when the network is disconnected or the router is disconnected and rebooted, we need to access Dynamic DNS to inform the user that the global IP has changed. We will install a script that will do this automatically. This time, we assume that you will use Value Domain as your DNS service. 3.Disk Usage Check Script 3.1 script # cd /var/www/system # vi disk_capacity_check.sh

1.Website data backup 1-1. Backup under /var/www/html ①Creating backup script files # cd /var/www/system # vi backup_html.sh 2.MySQL database backup ①Creating backup script files # cd /var/www/system 3.Restore backup files under html ① Store HTML backup files in "/ (root)" directory 4.Restoring Mysql Backup Files ①Save the backup file to any directory （In the example, the directory is "/var/www/backup/db_bak".） Unzip data