We all have bare-metal servres, VPS:es, containers and other things running. Some of them may be exposed openly to the internet, which is populated by autonomous malicious actors, and some may reside on a closed-off network since they contain sensitive data.
And there is a lot of solutions to monitor your servers, since none of us want our resources to be part of a botnet, or mine bitcoins for APTs, or simply have confidential data fall into the wrong hands.
Some of the tools I’ve looked at for this task are check_mk, netmonitor, monit: all of there monitor metrics such as CPU, RAM and network activity. Other tools such as Snort or Falco are designed to particularly detect suspicious activity. And there also are solutions that are hobbled together, like fail2ban actions together with pushover to get notified of intrusion attempts.
So my question to you is - how do you monitor your servers and with what tools? I need some inspiration to know what tooling to settle on to be able that detect unwanted external activity on my resources.
Reduce your threat profile.
Run sslh, 443 handles both SSL and ssh.
Adjust your host based firewall to just 443
Attack yourself on that port, identify the logs
Add the new profiles to fail2ban
Enable fail2ban email
If you don’t like email, use a service that translates email to notification.
Ntfy.sh is free notifications
Or…
Use something like tailscale and don’t offer a remote login to the general Internet.
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Reduce your threat profile. Run sslh, 443 handles both SSL and ssh. Adjust your host based firewall to just 443 Attack yourself on that port, identify the logs Add the new profiles to fail2ban Enable fail2ban email If you don’t like email, use a service that translates email to notification. Ntfy.sh is free notifications Or… Use something like tailscale and don’t offer a remote login to the general Internet.
I submitted your post to got here’s what it thought
https://shareg.pt/Tz0El4k