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this post was submitted on 28 Sep 2024
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I run a different LXC on Proxmox for every service, so it's a bunch. Probably a better way to do it since most of those just run a docker container inside them.
I wouldn't call that terribly efficient.
I would do 2-3 VMs with docker and maybe a network share
Why mix docker and VMs? Isn't docker sort of like a VM, an application-level VM maybe? (I obviously do not understand Docker well)
I like to run a hypervisor host as just that, a hypervisor host. The host being stable is important, and also reduce attack surface by only having it as that.
An LXC per service is somewhat overkill. A docker host running on LXC could likely run all the docker containers.
I mentioned above, and not to spam, but there might be a use case that requires a different host distribution. Networking isolation might be another reason why. For 90% of use cases, you’re correct.
Serious answer, I'm not sure why someone would run a VM to run just a container inside the VM, aside from the VM providing volumes (directories) to the VM. That said, VMs are perfectly capable of running containers, and can run multiple containers without issue. For work, our Gitlab instance has runners that are VMs that just run containers.
Fun answer, have you heard of Docker in Docker?
LXC is much more light weight than VMs, so it's not as much overhead. I've done it this way in case I need to reboot a container (or something goes wrong with an update) without disrupting the other services
Also keeps it consistent since I have some services that don't run in docker. One service per LXC
I have a real use case! I have a commercial server software that can run on Ubuntu or RHEL compatible distributions. My entire environment is Ubuntu. They also allow the server software to run in a docker container but the container must be running RHEL. Furthermore, their license terms require me to build the docker container myself to accept the EULA and the docker image must be built on RHEL! So I have an LXC container running Rocky Linux that gets docker installed for the purpose of building RHEL (Core is 8) imaged docker containers. It’s a total mess but it works! You must configure nested security because this doesn’t work by default.
Instructions here: https://ubuntu.com/tutorials/how-to-run-docker-inside-lxd-containers#1-overview