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Kubernetes 1.22: Reaching New Peaks

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We’re pleased to announce the release of Kubernetes 1.22, the second release of 2021!

This release consists of 53 enhancements: 13 enhancements have graduated to stable, 24 enhancements are moving to beta, and 16 enhancements are entering alpha. Also, three features have been deprecated.

In April of this year, the Kubernetes release cadence was officially changed from four to three releases yearly. This is the first longer-cycle release related to that change. As the Kubernetes project matures, the number of enhancements per cycle grows. This means more work, from version to version, for the contributor community and Release Engineering team, and it can put pressure on the end-user community to stay up-to-date with releases containing increasingly more features.

Changing the release cadence from four to three releases yearly balances many aspects of the project, both in how contributions and releases are managed, and also in the community's ability to plan for upgrades and stay up to date.

You can read more in the official blog post Kubernetes Release Cadence Change: Here’s What You Need To Know.

Read more

Also: GCC 12's Static Analyzer Gaining Initial Assembly Support

Kubernetes 1.22: Server Side Apply moves to GA

  • Kubernetes 1.22: Server Side Apply moves to GA

    Server-side Apply (SSA) has been promoted to GA in the Kubernetes v1.22 release. The GA milestone means you can depend on the feature and its API, without fear of future backwards-incompatible changes. GA features are protected by the Kubernetes deprecation policy.

    What is Server-side Apply?

    Server-side Apply helps users and controllers manage their resources through declarative configurations. Server-side Apply replaces the client side apply feature implemented by “kubectl apply” with a server-side implementation, permitting use by tools/clients other than kubectl. Server-side Apply is a new merging algorithm, as well as tracking of field ownership, running on the Kubernetes api-server. Server-side Apply enables new features like conflict detection, so the system knows when two actors are trying to edit the same field. Refer to the Server-side Apply Documentation and Beta 2 release announcement for more information.

Latest in Kubernetes 1.22

  • Kubernetes 1.22: CSI Windows Support (with CSI Proxy) reaches GA
  • New in Kubernetes v1.22: alpha support for using swap memory

    The 1.22 release introduced alpha support for configuring swap memory usage for Kubernetes workloads on a per-node basis.

    In prior releases, Kubernetes did not support the use of swap memory on Linux, as it is difficult to provide guarantees and account for pod memory utilization when swap is involved. As part of Kubernetes' earlier design, swap support was considered out of scope, and a kubelet would by default fail to start if swap was detected on a node.

    However, there are a number of use cases that would benefit from Kubernetes nodes supporting swap, including improved node stability, better support for applications with high memory overhead but smaller working sets, the use of memory-constrained devices, and memory flexibility.

    Hence, over the past two releases, SIG Node has been working to gather appropriate use cases and feedback, and propose a design for adding swap support to nodes in a controlled, predictable manner so that Kubernetes users can perform testing and provide data to continue building cluster capabilities on top of swap. The alpha graduation of swap memory support for nodes is our first milestone towards this goal!

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