2022-05

1. SSH Service Security Settings The SSH service allows root user login by default. The root user can log in to the server with administrator privileges if the password is known because the user name is already known. 1.1 Creating a General User If you have created a general user when installing Ubuntu 22, this procedure is not necessary. If the only user created on the server is root, remote login via SSH will not be possible, so if a user has not been created during OS installation, a user must be created in advance.

1.Introduced Clamav antivirus software 1.1 Install # apt install clamav clamav-daemon The clamav-related configuration files are installed in the /etc/clamav/ folder. 1.2 Virus Definition Update # systemctl stop clamav-freshclam  # freshclam

1. MySQL 8 Install 1. 1Install # apt -y install mysql-server 1.2. MySQL Server Security Settings Run the tool mysql_secure_installation to configure security-related settings for the MySQL server. Once executed, several security settings are initiated in the form of questions. First, you will be asked if you want to use a plugin for password validation as follows. Password validation is a way to check the strength of a user's password for MySQL and restrict it to only accepting passwords that are secure enough. For example, it must be at least as many characters long as the user's password and must contain at least one symbol and one number. You can set this requirement by asking the following questions Type y and press Enter if you like

1. DiCE  Install Whenever the global IP changes, which happens when the network is disconnected or the router is disconnected and rebooted, the dynamic DNS must be accessed to inform the user that the global IP has changed. DiCE does this automatically!