2022-06

1. Setting up SSH remote connection 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 SSH service configuration file changes 2. 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 Settings Build an NTP server to synchronize the server time with Japan Standard Time

Install Clamav ( anti-virus software ) 1.  Install 2. Edit C...

Install SNORT 1.advance preparation ①Add the CodeReady Red Hat repository and install the required software # dnf config-manager --set-enabled powertools Install Tripwire 1.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.rpm Install Chkrootkit ①Download 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.cnf Create a new charset.cnf with the following contents Install WordPress 1. Create database for Word Press As an example, assume database [wp_db] database user [wp_user] password [?W123456]

1. Logwatch ① Install # dnf install logwatch ② Edit configuration file # cat /usr/share/logwatch/default.conf/logwatch.conf >> /etc/logwatch/conf/logwatch.conf 2. Introduce disk usage check script 2.1 Scripting # cd /var/www/system

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 # cd /var/www/backup/html_bak # cp html_back_20220610.tar.gz /    ←Specify the backup file with the latest date 4. Restore Mysql Backup Files ①Save 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 cryptography Creation of public and private key pairs Create 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.