OK so my current strategy is that when I want to do a major update I simply make a copy of the vm image file, then I can drop it back in place if something goes wrong. I run KVM which means it just gives out CPU and memory as needed even though I can set maximums. The resources I’m using are laughably small anyway, half the systems run fine on a single cpu core although it was nice to recently bump web and mail services up higher (I just upgraded over the Summer from Poweredge 860 servers to some R620’s – crazy difference in available resources!). Same with memory, I have some systems running on as little as 512M, but I just bumped my web servers up to 8G to give them plenty of room. Considering I have 64G in each server with tons of space for growth, I’m not worried about any of that. And storage space… well it seems linux is suffering with bloat since the introduction of systemd as I’ve had to increase my image files from 4G to 8G for updates, but it’s still a drop in the bucket for storage. And all the services use shared storage space for things like email and websites, and I have around 105TB of shared storage, so again not really a concern.

Now it sounds like I kind of need TrueNas to easily use docker, which means another system that I would need to learn from scratch? Truenas scale says it’s built on debian and yet there are no debian packages available to install it, so I can only assume that I would have to completely replace all of my existing servers with brand new systems that I have no knowledge of troubleshooting, just so I can replace all of my existing VMs with docker images which I also have no knowledge of how to troubleshoot.

Sorry but none of this is selling me on the idea - it just sounds like I’m supposed to replace systems that work perfectly well with new systems that I can’t fix when they break? I’m really not understanding where the advantage is.