Runtime

Created Freitag 03 Januar 2020

Low level runtime / runtime

Also kown as low-level container runtimes.
A container runtime starts containers.
What they do:

• Create cgroup
• Run command(s) in cgroup
• Unshare to move to its own namespaces
• Clean up cgroup after command completes (namespaces are deleted automatically when not referenced by a running process)

List of some runtimes:

• runc
• lxc (not the lxd control tool)
• rkt (is more)
• lmctfy

High level runtime

Outsource container start to low level runtime. In my opinion they should be called something like container manager.
The manage container image repositories, images, and low level runtimes. The help build images.
List of some runtimes:

• Cri-O
• containerd
• rkt
• lxd
• Docker
• Podman

Container Runtime Interface (CRI)

Infos
Interface between Kubernetes (or other container cluster / node manager) and high level runtimes.