Tuesday, April 4, 2017

Container Runtime Interface in Kubernetes 1.6






Kubernetes 1.6 was released March 26, 2017.

What’s new in Release 1.6


According to the blog post from Kubernetes, this release focuses on scale and automation. Mirantis has a very good “What’s new in Kubernetes 1.6”. In this article, it listed the following categories of major changes:
  • DaemonSet rolling updates
  • Kubernetes Federation
  • Authentication and access control improvement
  • Scheduling changes
  • Container Runtime Interface is now the default
  • Storage improvements
  • Networking Improvements
  • Other Changes
“Other changes” is the catchall category for those changes that are also important. For all the changes in release 1.6, check out the release notes on GitHub.

Kubernetes also has a blog post describing release 1.6.


Container Runtime


 Kubernetes is a container orchestration engine. For container to run on the host, it needs to have a container runtime. Back in release 1.0, Kubernetes only support the Docker container runtime – runc. In release 1.3, rkt is added. In release 1.5 the Container Runtime Interface is added to allow Kubernetes to support a wider range of container runtime to integrate with kubelet on a node. The container runtime interface in Kubernetes 1.5 release as alpha and the Docker container runtime remains to be the default. With this interface, for Kubernetes to support a new container runtime, it does not need to be integrating deep in the kubelet source code.


What is Container Runtime Interface?


 In brief, the Container Runtime Interface is an abstraction layer allowing kubelet to interface with any container runtime. Before release 1.5, without this interface, adding container runtime support will have to make coding changes to the kubelet source code.

This diagram explains how the Container Runtime Interface works:





 image source: http://blog.kubernetes.io/2016/12/container-runtime-interface-cri-in-kubernetes.html

Container Runtime Interface interacts with kubelet uses the gRPC protocol. This blog post from Kubernetes has a more detailed description on Container Runtime Interface. Like any open source project GitHub usually has good documentation on the subject.

Container Runtime Interface is turned on as the default behavior in Kubernetes 1.6 even it is still in beta status. Beside runc and rkt, currently these container runtime are in developement to work with CRI:

cri-o: OCI conformant runtimes.
rktlet: the rkt container runtime.
frakti: hypervisor-based container runtimes.
docker CRI shim.

Kubernetes Resources





10 comments:

  1. This information really worth saying, i think you are master of the content and thank you so much sharing that valuable information and get new skills after refer that post.
    Architectural Firms in Chennai
    Architects in Chennai

    ReplyDelete

  2. Wonderful blog.. Thanks for sharing informative Post. Its very useful to me.

    Installment loans
    Payday loans
    Title loans

    ReplyDelete
  3. very very amazing explaintion....many things gather about yourself...yes realy i enjoy it
    Digital Marketing company in Chennai

    ReplyDelete
  4. you are posting a good information for people and keep maintain and give more update too.
    seo-company-in-india

    ReplyDelete

  5. Its a wonderful post and very helpful, thanks for all this information. You are including better information regarding this topic in an effective way.Thank you so much

    Installment loans
    Payday loans
    Title loans
    Cash Advances

    ReplyDelete
  6. Interesting blog about container runtime interface which attracted me more.Spend a worthful time.keep updating more.
    Digital marketing company in Chennai

    ReplyDelete


  7. This information is impressive; I am inspired with your post writing style & how continuously you describe this topic.


    Pawn Shop

    Pawn Loans

    Pawn Shops

    Pawn Loan

    Pawn Shop near me

    ReplyDelete
  8. Nice post, thanks for sharing this useful information.
    Click More Details Visit Our Website

    Texus
    Texus Systems

    ReplyDelete
  9. Very helpful suggestions that help in the optimizing website. thank for sharing the link.

    หนังไทย

    ReplyDelete