proxmox server completely crashed with out of memory error

tho1h

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Jun 6, 2018
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This morning one of our proxmox servers completely crashed and took down the VM with it. The server was still on and I was able to connect to is via console. The error was 'Out of memory'. I've also seen this proxmox server over a few weeks suck the CPUs completely dry (this server is only running a single linux vm with nginx on it (as an nginx failover), so it's not doing anything at all/not active).

I've attached a crappy photo of the errors since I was not able to copy/paste the logs/errors from the console:
screen.jpg

Does anyone know why and how to prevent this in the future?
 
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