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Proxmox host stops responding, LXC continues
(infosec.pub)
Proxmox VE is a complete, open-source server management platform for enterprise virtualization. It tightly integrates the KVM hypervisor and Linux Containers (LXC), software-defined storage and networking functionality, on a single platform. With the integrated web-based user interface you can manage VMs and containers, high availability for clusters, or the integrated disaster recovery tools with ease.
Hardware issues are often the case. I'll put my advice as a top comment.
Good point. All my VMs were on a zfs array.
It seemed like enough of the system was in ram that it could still run, but anything that needed the root file system was out of luck.