Let’s configure our first jail that blocks an IP address
Fail2ban is a complete package
Fail2ban is different from swatch in the following ways:
- Fail2ban installs as a complete service that will start on boot without further configuration
- Fail2ban will work with iptables firewall to block traffic from anyone who violates its rules
- Fail2ban can watch multiple log files without having to run multiple processes
With all of those advantages, I see one disadvantage to using fail2ban:
- Fail2ban expects an IP Address or hostname in each log message. If you want to report on a message that does not include an IP Address or a hostname, you will have to utilize a work-around to use fail2ban.
Fail2ban is used by e2e.ee
If you watch the messages in our monitor chatroom
firstname.lastname@example.org you will sometimes see that fail2ban has blocked someone.
Someone tried to send too many messages too quickly and got blocked by fail2ban.
Fail2ban reacts in real-time, blocking the offenders IP address and sending a text message. This is a powerful tool for keeping a web service going.
Just use your package manager to install fail2ban on linux.
apt install fail2ban
Starting, Stopping, Status
# Start fail2ban service fail2ban start # Stop fail2ban service fail2ban stop # Is fail2ban running? service fail2ban status
Let’s configure fail2ban to watch a log, but not block an IP address
When you need to know about what fail2ban is doing, use the client