What is Fail2ban?

Fail2Ban is a free, open-source software tool that protects servers from brute-force attacks and other types of malicious activity. It monitors log files for suspicious activity and blocks IP addresses that are trying to access a server.

Why use Fail2ban?

There are several reasons to use Fail2ban:

• Prevents brute force attacks on services
• Reduces server load from automated login attempts
• Provides an extra layer of security beyond firewalls
• Notify when there is an IP is ban/unban through SMTP, Webhook

How it works

• Fail2Ban scans log files for suspicious activity, such as too many access, failed attempts through access or error files
• Fail2Ban creates a firewall rule to block the IP address that is causing the suspicious activity
• The IP address is blocked for a specified amount of time

Basic understanding Fail2ban

Jails:

• Jails serve as rule sets that dictate the conditions under which an IP address should face a ban which defined by monitoring log files
• Predefined jail configurations can be found in /etc/fail2ban/jail.conf within Fail2ban

Filters:

• Filters are instrumental in scrutinizing service logs using regex patterns to identify potentially malicious activities, like intrusion attempts.
• These filters are typically stored in /etc/fail2ban/filter.d/

Actions:

• Actions encompass a range of responses, from IP address bans to notifications and the execution of custom scripts
• Commands outlining ban or unban procedures for IP addresses are typically housed in /etc/fail2ban/action.d/

GitHub Sample Repository 🐳

Enjoy you practice 🌟### What is Fail2ban?Fail2Ban is a free, open-source software tool that protects servers from brute-force attacks and other types of malicious activity. It monitors log files for suspicious activity and blocks IP addresses that are trying to access a server.

Why use Fail2ban?

There are several reasons to use Fail2ban:

• Prevents brute force attacks on services
• Reduces server load from automated login attempts
• Provides an extra layer of security beyond firewalls
• Notify when there is an IP is ban/unban through SMTP, Webhook

How it works

• Fail2Ban scans log files for suspicious activity, such as too many access, failed attempts through access or error files
• Fail2Ban creates a firewall rule to block the IP address that is causing the suspicious activity
• The IP address is blocked for a specified amount of time

Basic understanding Fail2ban

Jails:

• Jails serve as rule sets that dictate the conditions under which an IP address should face a ban which defined by monitoring log files
• Predefined jail configurations can be found in /etc/fail2ban/jail.conf within Fail2ban

Filters:

• Filters are instrumental in scrutinizing service logs using regex patterns to identify potentially malicious activities, like intrusion attempts.
• These filters are typically stored in /etc/fail2ban/filter.d/

Actions:

• Actions encompass a range of responses, from IP address bans to notifications and the execution of custom scripts
• Commands outlining ban or unban procedures for IP addresses are typically housed in /etc/fail2ban/action.d/

GitHub Sample Repository 🐳

Enjoy you practice 🌟