I'm new to sysadmin and Linux, and I have a few important questions about server security. If my server's root user gets compromised and I don't have a backup, what steps should I take? How can I safely restore my server? Also, what can I do to ensure my servers are secure from malicious files or backdoors? Which directories should I check, and what essential tools should I have to protect against attacks? Finally, if my server goes into panic mode or any critical files get deleted, how can I restore it safely from rescue mode? Any resources or documentation on these topics would be greatly appreciated!
1 Answer
Great questions! First off, if your server is compromised, the first step is to disconnect it from the network to prevent further issues. Restoring without a backup is tough; you'll likely need to rebuild the OS and data from scratch. It’s a hassle, but it clears away lingering doubts about hidden threats. For ensuring safety, security isn’t just about one tool—it’s about layering protections. Remove unnecessary access, set up firewalls, and regularly monitor logs. Remember, backups are crucial. They can save you when something goes wrong, so set up a solid backup strategy.
Thanks for the detailed answer! I'm definitely going to look into those backup strategies you mentioned.