Resolved Update 18.0.60 on AlmaLinux = high cpu steal value

[rkbonatto]

Server operating system version

Almalinux 8

Plesk version and microupdate number

18.0.60

The recent update 18.0.60/61 caused the cpu steal value to increase sharply, causing slowdowns on websites and servers. The same behavior is repeated on all servers that I have AlmaLinux 8.10 (Cerulean Leopard).

The other servers with Centos7 that also received the 18.0.60/61 updates are not having any problems.

Take a look on 3 different servers with Plesk on AlmaLinux8, the problem starts with the update at 05/29





Plesk on Centos7 with the same update but with no problem.


Anyway to solve this?

 

[Maarten.]

It's hard to tell why there is such a high CPU load. The date it started is the date Almalinux 8.10 went live.
- Did you have a look at /var/log/messages ? Are there any related issues in there?
- Did you reboot the server after the upgrade so it runs on the new kernel?
- Any related issues shown in htop or glances?

 

[rkbonatto]

Kernel version - 4.18.0-477.21.1.el8_8.x86_64
It is the same kernel in all servers with alma linux
This is strange because I restarted the server 3 or 4 times.

In logs there are no related issues.

 

[Maarten.]

Did you see anything in htop or glances? Are there processes that use a lot of CPU?

For the next time, I advise you to wait a couple of weeks before upgrading to a major update. This won't happen after the 8.10 release (it's the last one in the 8.x release) but for other servers, try not to upgrade immediately as soon as there is a new release.

 

[rkbonatto]

Did you see anything in htop or glances? Are there processes that use a lot of CPU?

For the next time, I advise you to wait a couple of weeks before upgrading to a major update. This won't happen after the 8.10 release (it's the last one in the 8.x release) but for other servers, try not to upgrade immediately as soon as there is a new release.

I just updated to the latest kernel (4.18.0-553), let's see if the problem persists.
All servers are with automatic updates On

 

[Maarten.]

You should turn the automatic updates off. Keep an eye on the Plesk changelog. As soon as there is a new version, install the version before that using the command line. That way, you're always a release behind but that gives you the assurance there are no more major issues:

plesk installer --all-versions

This is my configuration on all servers:

 

[rkbonatto]

Take a look on glances, don't seem to be any processes that justify stealing the cpu, I updated the kernel to the recent version it is running, I also disabled docker but the problem persists.

 

[rkbonatto]

After a detailed analysis, it was possible to verify that the problem faced was occurring due to the AlmaLinux 8.10 update that is causing some type of bug with the Proxmox virtualizer, on other occasions I have experienced other bugs related to AlmaLinux and Proxmox, it turns out that Proxmox it does not update as frequently as Alma and ends up not receiving recent Alma kernels and packages properly.
As we can see now, the steal value has decreased by almost 100% compared to before.
Unfortunately, to solve the problem it was necessary to migrate the entire VM to another server.

 

[mow]

it turns out that Proxmox it does not update as frequently as Alma and ends up not receiving recent Alma kernels and packages properly.

Huh? proxmox is on 6.8.4-3-pve.