Hi guys,

 

the Fix Common Problems plugin reported, that I have several Out of memory errors on my server. For resolving this issue I should post my diagnostics here in the forum.

 

I think I might know from where these errors came from, so here some background information:

- My server has 32 GB of RAM, around 7 GB are used in idle

 

- Yesterday I created a Ubuntu server vm and assigned first 6 GB to the vm (Initial and Max memory = 6 GB). On this vm I installed Nextcloud All In One with all the available containers. On this vm, I think I ran out of memory, when the NC did some scans (build up the photo library, etc.).

- Then I added 2 GB more Ram to the vm, so that it has a total of 8 GB.

 

- Suddenly I noticed, that my unraid server used over 90% of its Ram permanently and the CPU usage went up to around 100%, so I checked the Ram usage of the Ubuntu VM. This was around 5 GB. 

- Since CPU and memory usage didn't go down, I shut down the Ubuntu server vm and after some minutes, CPU and memory were at a normal level again. 

 

I also have a screenshot of the Memory utilization recorded by my Zabbix Server. The time in the graph, where the gap is, I restarted the server and before that, the zabbix agent on the unraid server was not available.

 

I hope, you can help me find out, what process caused this OOM error.

 

Thank you for your help!

Maginos

 

tilda-diagnostics-20231229-1031.zip

Some further information concerning the Ubuntu vm:

Since yesterday, I had network connectivity errors coming from nowhere. Today I obverved, that the vm doesn't get an IP address from the DHCP server. I was able to resolve this by executing the command "dhclient enp1s0". After that, the vm got a valid IP address from the DHCP server. To make this persistent, I edited the file in the /etc/netplan/ folder and changed "enp11s0" to "enp1s0" (for whatever reason the interface name is wrong...). After a reboot, the vm got its IP from the DHCP.

 

While I was working today on this problem, the unraid host ran into high memory and cpu utilization again (screenshot below). I checked the cpu utilization of the vm again and it was around 50% (4 GB). I shut down the vm and after around 5 minutes, CPU and memory on the unraid host went back to normal. 

So I think it's very likely, that the OOM error is related with the ubuntu vm. 

After deactivating Talk in the Mastercontainer, the OOM errors were gone, so this seemed to be the fix.