OK. We have configured SSH server. The time has come to making it a little safer.
1.1. install:
dnf install fail2ban -y
1.2. if it’s not working have to install:
yum install epel-release
2. create a file with your favourite text editor, such as vi:
vi /etc/fail2ban/jail.d/sshd.local
3. with the following content:
[sshd] enabled = true port = 2222 logpath = %(sshd_log)s maxretry = 4 bantime = 86400
4. start the service:
systemctl start fail2ban systemctl enable fail2ban