As far as I know, Firecracker, gVisor, and Kata Containers are the solution here. They use VM primitives (x64_64 and ARM64 extensions) and have lighter codebases
But I don't have any direct experience with any of them. I'd be curious what people who have built on top of them think
edit: OK it looks like Kata can use Firecracker, so as far as isolation, it's Firecracker or gVisor. And Firecracker is the VMM I mentioned, but gVisor is quite different -- it's more like a user space kernel that emulates syscalls.
As I understand it Kata supports multiple VMM backends, Firecracker, QEmu, Cloud Hypervisor, and their own Dragonball. Except QEmu, I believe those are all built on crates in the rust-vmm ecosystem, each making slightly different tradeoffs.
https://news.ycombinator.com/item?id=30623372 (250 points | March 10, 2022 | 27 comments)
https://news.ycombinator.com/item?id=22232705 (267 points | Feb 4, 2020 | 29 comments)
https://news.ycombinator.com/item?id=15608435 (440 points | Nov 2, 2017 | 53 comments)
I don't think we should consider containers to be a security boundary. Even full VMs can be escaped, and have been, many times.
The fact that this is possible in the first place makes me think we need a much better approach.
https://firecracker-microvm.github.io/
https://gvisor.dev/
https://katacontainers.io/
But I don't have any direct experience with any of them. I'd be curious what people who have built on top of them think
edit: OK it looks like Kata can use Firecracker, so as far as isolation, it's Firecracker or gVisor. And Firecracker is the VMM I mentioned, but gVisor is quite different -- it's more like a user space kernel that emulates syscalls.
https://github.com/smol-machines/smolvm