3 different servers crashed at the same time, what could be the reason?

Question

CentOS

Hello. If 3 different servers on Centos 7 with Isp manager. I can’t understand why there were falls for 15 minutes at about 6 in the morning.

Server 1: Yandex Metrica recorded a crash yesterday morning at 6:03 am Description of the problem: Failed to process the document, HTTP code: 522. After 12 minutes, it came to life.

Server 2: Hung yesterday at 6:13, the metric fixed Description of the problem: Could not connect to the HTTP server for the same 15 minutes.

Server 3: hung at 6:00 today, posted at 6:15. And in the logs on the site for this period of time there are no records. And the CPU load was 0%.


All servers are backed up, but it should not affect, because it is done at 3 am and only 5-6 minutes.

Servers are powerful:




Tell me how to identify the cause? What could it be ? I will be grateful for any help.

Answer 1

Study server logs

Answer 2

Dude, it's a hatzner