Had to dig a bit into Kubernetes’ friends recently. Here’s a TL;DR of what’s missing from the internet today:
runcis the CLI tool for running containers (create/run/delete/
runcas its runtime.
- Kubernetes uses
runcas its runtime through
cri-o(those “unsupported Docker version detected” errors you’ve probably seen.. yeah!) There’s no guarantee that
cri-ois an interface for container runtimes. Any compatible runtime can be used.
runcis one of those others being
rkt(never tested it), Kata containers and I guess many more.
containerd- runtime manager created by docker and later contributed to CNCF. It’s the daemon that’s running in the background doing your bidding that you pass through