2022-06

1. Setting up SSH remote connectionSSH 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 SSH service configuration file changes2. How to set up a firewall (firewalld)In Rocky, the firewall is set to firewalld by default and is 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).4. NTP Server SettingsBuild an NTP server to synchronize the server time with Japan Standard Time

Install Clamav ( anti-virus software )1.  Install2. Edit Cla...

Install SNORT1.advance preparation①Add the CodeReady Red Hat repository and install the required software# dnf config-manager --set-enabled powertoolsInstall Tripwire1.Download and installation# cd /usr/local/src# wget https://rpmfind.net/linux/epel/8/Everything/x86_64/Packages/t/tripwire-2.4.3.7-5.el8.x86_64.rpmInstall Chkrootkit①Download and install chkrootkit# cd /usr/local/src# wget https://launchpad.net/chkrootkit/main/0.55/+d

Install Mysql8＃dnf module -y install mysql:8.0＃vi /etc/my.cnf.d/charset.cnfCreate a new charset.cnf with the following contentsInstall WordPress1. Create database for Word PressAs an example, assume database [wp_db] database user [wp_user] password [?W123456]

1. Logwatch① Install# dnf install logwatch② Edit configuration file# cat /usr/share/logwatch/default.conf/logwatch.conf >> /etc/logwatch/conf/logwatch.conf2. Introduce disk usage check script2.1 Scripting# cd /var/www/system

1.Website data backup1-1. Backup under /var/www/html①Creating backup script files# cd /var/www/system# vi backup_html.sh2. MySQL database backup①Creating backup script files# cd /var/www/system3. Restore backup files under html① 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 date4. Restore Mysql Backup Files①Save DB backup file to any directory(In the example, the directory is "/var/www/backup/db_bak") Extract data

SSH connection with authentication using RSA public key cryptographyCreation of public and private key pairsCreate a public/private key pair for a user connecting to a Linux server using OpenSSH.Use ssh-keygen to create the key pair.This time, we will create a key set using the RSA cipher used in the SSH protocol Version 2.Creation of public/private key pairs is performed with remote login user privileges (huong).If you do not specify the destination and file name, id_rsa and id_rsa.pub will be created in /home/huong/.ssh/. On the way, enter the password for the key.