Install and configure Fail2ban on Rocky Linux 8

Run all commands bellow as root


Enable and start firewalld:

systemctl enable firewalld && service firewalld start

Install Fail2ban

dnf install -y epel-release 
dnf install -y fail2ban fail2ban-firewalld

Start and enable:

systemctl start fail2ban
systemctl enable fail2ban

Check if fail2ban is running:

systemctl status fail2ban

Configure ssh jail

cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local
mv /etc/fail2ban/jail.d/00-firewalld.conf /etc/fail2ban/jail.d/00-firewalld.local

edit configuration for sshd

vi /etc/fail2ban/jail.d/sshd.local

put the following in it:

enabled = true
bantime = 1d
maxretry = 3

Restart and enable the jail:

systemctl restart fail2ban 

Check if the jail is working:

fail2ban-client status sshd 

It will output something like this:

Status for the jail: sshd
|- Filter
|  |- Currently failed:	1
|  |- Total failed:	20
|  `- Journal matches:	_SYSTEMD_UNIT=sshd.service + _COMM=sshd
`- Actions
   |- Currently banned:	2
   |- Total banned:	2
   `- Banned IP list:

Unban an IP

If you need to unban an IP for any reason:

fail2ban-client unban THE_IP_TO_UNBAN