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RE: Secure server against attacks and viruses
Very good post.
What about updates? 🖥️
SELinux?
Center for Internet Security offer guides on securing you box further
https://www.cisecurity.org/cis-benchmarks/
Ive personally used Lynis on a few tests very useful for a quick audit check.
https://cisofy.com/lynis/
Diving deeper you could run some Security Scanners such as Nessus or OpenVAS frequently to make sure theres no silly holes. Alienvault is also a good Free IDS
http://www.openvas.org/
https://www.alienvault.com/
https://www.tenable.com/products/nessus/select-your-operating-system
The guide was supposed to hit the novices / learners. It is worthwhile to describe the apparmor as many profiles are in the repository.
We can talk later, I'm going to a Linux conference