Fail2ban Basic

How to install?

Debian/ Ubuntu
apt update -y && apt install fail2ban -y​

CentOS / Redhat

yum update && yum install fail2ban -y

Activated Jail list

fail2ban-client status

Actions under a jail

iptables -L -n

How to start / stop / restart

service fail2ban start 
service fail2ban stop
service fail2ban restart

How to ban/unban an IP?

fail2ban-client set JAILNAME banip IP_ADDRESS
fail2ban-client set JAILNAME unbanip IP_ADDRESS

Wants to Permanent Whitelist an IP?

nano /etc/fail2ban/jail.conf

Then fine the line called ignoreip=

There, you will just need to add the IP with space.

For example

ignoreip =

If you see # symbol infront of ignoreip, please remove that. IP has been whitelisted in the above example

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