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In an era where automated bots and attackers relentlessly scan servers looking for vulnerabilities, administrators have to keep their finger on the pulse of security. This is especially true for bruteforce attacks, where attackers endlessly search through passwords hoping to find the right one. If the server isn't secure, sooner or later someone will get to the wrong place.
Fortunately, there's a tool that helps block such "guests" automatically. Meet Fail2Ban — a program that analyzes logs and blocks IP addresses from which suspicious activity is coming. How does it work and how do you set it up correctly? Let's find out.
DDoS (Distributed Denial of Service) — is an attack where your server or website is flooded with a huge number of requests from multiple devices at the same time. Imagine, it's like having thousands of visitors trying to enter your small cafe with 10 tables at the same time - you simply don't have enough resources to serve them all. And your regular customers won't even be able to get to the door!
The Internet — is not only a sea of opportunities, but also a source of constant threats to your server. If left unprotected, it can fall victim to attacks such as hacking, spamming, or malicious users using your resources.
In 2024, the support period for the popular CentOS 7 operating system, which many users and server admins considered the de facto standard for use on their physical and virtual servers, ended. The era of CentOS 7 is over, and it has been replaced by newer OSes
But what do you do when the operating system is running like clockwork and there is no sense, opportunity or desire to upgrade a perfectly working and reliable system to newer releases? After the end of support, CentOS 7 users faced the problem that the standard repositories from which they could install utilities or non-essential libraries became unavailable
When we ran the yum update, we saw the following:
