We're currently deploying several Linux VPS

We're currently deploying several Linux VPS instances for blockchain applications, including a DEX backend, and I want to make sure we're following modern security recommendations from the very beginning. I'm especially interested in practical advice rather than generic cybersecurity checklists. Ideally, the guide should explain how to reduce the attack surface, secure validator or node infrastructure, and protect critical services without affecting performance. Can anyone recommend a comprehensive article on this topic?

Many developers spend weeks auditing smart contracts but leave the Linux server almost untouched. In my opinion, that's a mistake because attackers usually look for the easiest entry point. While searching for practical advice, I came across https://commandlinux.com/blog/securing-your-dex-deployment-linux-hardening-practices-for-blockchain-infrastructure/ and honestly found it more useful than several YouTube videos combined. It covers Linux hardening practices for blockchain infrastructure, reducing the attack surface, securing SSH, permissions, and monitoring in a straightforward way. I don't agree with every recommendation, but the overall approach makes sense if you're serious about securing a DEX deployment instead of hoping nothing bad happens.