Just as a guess Hyper-V containers? https://docs.microsoft.com/en-us/virtualization/windowsconta...
github.com/hyperhq/runv
Re:Azure Container Instances
by justincormack on Wednesday July 26, 2017 @03:20PM
(#14859273)
It appears as far as I can tell to be running Docker on Ubuntu on Hyper-V, but with one container per VM.
Does anybody know if they mentioned anywhere what they use? LXC or Jails? Or some homegrown stuff?