containerd

Abstraction of containerd, for LT.

Transcript

1. containerd Future-Daily-Standup-Meeting Kubernetes Ecosystem Study Yasuhiro Murata 2019.09.10
2. What is containerd ?
3. What is containerd ? An industry-standard container runtime with an emphasis on simplicity, robustness and portability Graduated at Feb 28th 2019
4. What is containerd ? u containerd is available as a daemon for Linux and Windows, conforming CRI(Container Runtime Interface) Manages the complete container lifecycle
5. What is CRI ?
6. What is CRI ? u CRI(container runtime interface) and OCI(open container initiative) l CRI runtime, also be called High-level runtime, receive request from kubelet. l OCI runtime, also be called Low-level runtime, receive request from High-level runtime and use kernel to create container environment. kubelet CRI runtime OCI runtime containers
7. What is CRI ? u A plugin interface which enables kubelet to use a wide variety of container runtimes l Container runtimes were integrated with kubelet through implementing an internal, high- level interface in kubelet. l Integration required understanding the internals of kubelet and contributing to the main Kubernetes repository. l CRI is one small, yet important step to enable pluggable container runtimes and build a healthier ecosystem. https://kubernetes.io/blog/2016/12/container-runtime-interface-cri-in-kubernetes/ container runtime (and CRI shim) connects Kubelet and containers
8. containerd EVOLUTION
9. containerd EVOLUTION u containerd integration architecture has evolved twice. https://kubernetes.io/blog/2018/05/24/kubernetes-containerd-integration-goes-ga/ A daemon called CRI-Containerd was required to operate between Kubelet and containerd
10. containerd EVOLUTION u containerd integration architecture has evolved twice. https://kubernetes.io/blog/2018/05/24/kubernetes-containerd-integration-goes-ga/ CRI-Containerd daemon is now refactored to be a containerd CRI plugin
11. containerd EVOLUTION u No more Docker? l The answer is NO. Docker use containerd, which have CRI plugin. https://kubernetes.io/blog/2018/05/24/kubernetes-containerd-integration-goes-ga/
12. containerd with Kubernetes
13. containerd with Kubernetes u There’re various container runtimes such as... • Docker • cri-o • containerd • frakti
14. containerd with GKE
15. containerd with GKE Currently, GKE only supports the use of Docker containers for your workloads. Support for other types of containers is planned for upcoming releases. https://cloud.google.com/kubernetes-engine/docs/concepts/kubernetes-engine-overview 2019.09.10
16. Fin.