Issue Sporadically unreachable websites

[Eirik Sikveland]

Hello!

I'm fairly new to Plesk but not to the overall game. I have a few websites running on Plesk Dedicated Server. And everything is working like a charm.

But once in a while, sporadically, maybe twice a month or so all the hosted websites is unreachable except the Plesk panel, the panel works fine every time.

The downtime for the websites vary for each time, from a few minutes up to 30minutes. If I reboot the server, its works fine again.

Have anyone encountered this issue before?
Or do anyone know how to find and eliminate the issue?

Thanks for you time!

 

[Bitpalast]

We've seen this issue when the system has too many open files, although you might not be hosting many domains. What is happening is that a configuration change by a user or an update requires a restart or reload of a system service. This reload fails because further open files are disallowed. This situation does not happen frequently, but it can happen from time to time if your open file handle limits are too low. I suggest following https://kb.plesk.com/en/115139 and https://kb.plesk.com/en/121268. You may also need to modify etc/sysctl.conf (add/modify fs.file-max) and /etc/security/limits.conf (add/modify hard and soft max values or nginx, root, psaadm, mysql), then # systemctl --system daemon-reload.

 

[Eirik Sikveland]

Thanks for your reply. I will try to get this sorted out.

A small update: Happened again today, checked the apache status and is was not running. It was stopped somehow. Don't know if it's because it fails to start again, but once I clicked the Start Service button in the plesk panel, it started without any issues.