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- fail2ban / brute forcing prevention
- quick, frequent updates(!)
- containerization / virtualization
- secure passwords, better keys
- firewall
- a hardened operating system (distribution)
- SELinux / Apparmor / … / OpenBSD
- not installing unnecessary stuff
- An admin who is an expert and knows what they do.
Me, two+ decades into tinkering and still a dumbass: “look at me, I’m the expert admin now”
