Issue Server keeps crashing. Is it memory or something else I am missing?

[johnamber]

Server operating system version

CentOS Linux 7.9.2009 (Core)

Plesk version and microupdate number

Plesk Obsidian v18.0.74_build1800251204.13 os_CentOS 7

Hello,

Our server went down twice this month, and I am having trouble figuring out the cause. What I did find was that the memory caching keeps building up over time slowly. I was under the impression that it dumps cache as new processes are needed, but not sure if that is the case and is what is causing the system crashes. When the system went down on 12/04 the memory cache wasn't at peak though. That is if both crashes are related at all, and if memory is even the issue? Maybe it is Mysql?

When I reboot the system the Plesk logs start at the time of reboot. Any help would be greatly appreciated on where to look now.

Thanks in advance,
Johnny

 

[johnamber]

I forgot to add this to thread...

 

[WebHostingAce]

Please explain what you meant by 'server went down' or 'system crashes'

 

[johnamber]

Please explain what you meant by 'server went down' or 'system crashes'

Hello WHA,
Surely... When whichever event cause the server to crash then I cannot access anything on the server, not even SSH. I then have to reboot the server and everything runs smoothly for a bit. This has happened numerous times... btw I do have fail2ban and other security measures enabled as such with plesk.

I wasn't sure if this type of memory use is normal but seemed off.

Thanks! Johnny

 

[Kaspar]

Based on the graphs you posted, your memory usage looks completely fine and is likely not the cause of your server freezing up. Also see: Help! Linux ate my RAM!

If you can't access your server via SSH, try to see if you can access it via a remote/virtual console from your provider and investigate from there.

 

[johnamber]

Based on the graphs you posted, your memory usage looks completely fine and is likely not the cause of your server freezing up. Also see: Help! Linux ate my RAM!

If you can't access your server via SSH, try to see if you can access it via a remote/virtual console from your provider and investigate from there.

Thanks for your help. That link was one of the first places I visited when I was researching the server issue. I know IONOS has a 'serial console' for dedicated servers. If or when this arises again then I will have do that.

For now, I am trying to discover what caused it from what I can access and is available at this point. Trying to find what event that triggered Plesk and websites to go down?

Appreciate the input and help,
Johnny