Uptimerobot alerted me that one of our Moodle servers was down.
The database server is not responding, that was the reason.
Initiated a restart, hoping this may solve the problem. 10 minutes later, systems were up.
Copy-pasting from an email exchange about the reasons:
It could have any of the following causes:
1. automated bot attack
2. some services not restarted properly after an automated system update
3. some other issue triggered by some user action
Right now I'm not digging into the logs for troubleshooting, in case the issue happens again, will do more digging.
We anyway would need a server upgrade some time in the first half of 2024 for operating system upgrades - at that time, I could tighten some of the parameters for better security (like the open ports with default services present currently).
1. automated bot attack
2. some services not restarted properly after an automated system update
3. some other issue triggered by some user action
Right now I'm not digging into the logs for troubleshooting, in case the issue happens again, will do more digging.
We anyway would need a server upgrade some time in the first half of 2024 for operating system upgrades - at that time, I could tighten some of the parameters for better security (like the open ports with default services present currently).
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