Posts in 2021
Introducing Single Pod Access Mode for PersistentVolumes
By Chris Henzie (Google) | Monday, September 13, 2021 in Blog
Last month's release of Kubernetes v1.22 introduced a new ReadWriteOncePod access mode for PersistentVolumes and PersistentVolumeClaims. With this alpha feature, Kubernetes allows you to restrict volume access to a single pod in the cluster. What are …
Alpha in Kubernetes v1.22: API Server Tracing
By David Ashpole (Google) | Friday, September 03, 2021 in Blog
In distributed systems, it can be hard to figure out where problems are. You grep through one component's logs just to discover that the source of your problem is in another component. You search there only to discover that you need to enable debug …
Kubernetes 1.22: A New Design for Volume Populators
By Ben Swartzlander (NetApp) | Monday, August 30, 2021 in Blog
Kubernetes v1.22, released earlier this month, introduced a redesigned approach for volume populators. Originally implemented in v1.18, the API suffered from backwards compatibility issues. Kubernetes v1.22 includes a new API field called …
Minimum Ready Seconds for StatefulSets
By Ravi Gudimetla (Red Hat), Maciej Szulik (Red Hat) | Friday, August 27, 2021 in Blog
This blog describes the notion of Availability for StatefulSet workloads, and a new alpha feature in Kubernetes 1.22 which adds minReadySeconds configuration for StatefulSets. What problems does this solve? Prior to Kubernetes 1.22 release, once a …
Enable seccomp for all workloads with a new v1.22 alpha feature
By Sascha Grunert (Red Hat) | Wednesday, August 25, 2021 in Blog
This blog post is about a new Kubernetes feature introduced in v1.22, which adds an additional security layer on top of the existing seccomp support. Seccomp is a security mechanism for Linux processes to filter system calls (syscalls) based on a set …
Alpha in v1.22: Windows HostProcess Containers
By Brandon Smith (Microsoft) | Monday, August 16, 2021 in Blog
Kubernetes v1.22 introduced a new alpha feature for clusters that include Windows nodes: HostProcess containers. HostProcess containers aim to extend the Windows container model to enable a wider range of Kubernetes cluster management scenarios. …
Kubernetes Memory Manager moves to beta
By Artyom Lukianov (Red Hat), Cezary Zukowski (Samsung) | Wednesday, August 11, 2021 in Blog
The blog post explains some of the internals of the Memory manager, a beta feature of Kubernetes 1.22. In Kubernetes, the Memory Manager is a kubelet subcomponent. The memory manage provides guaranteed memory (and hugepages) allocation for pods in …
New in Kubernetes v1.22: alpha support for using swap memory
By Elana Hashman (Red Hat) | Monday, August 09, 2021 in Blog
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 …
Kubernetes 1.22: CSI Windows Support (with CSI Proxy) reaches GA
By Mauricio Poppe (Google), Jing Xu (Google), Deep Debroy (Apple) | Monday, August 09, 2021 in Blog
The stable version of CSI Proxy for Windows has been released alongside Kubernetes 1.22. CSI Proxy enables CSI Drivers running on Windows nodes to perform privileged storage operations. Background Container Storage Interface (CSI) for Kubernetes went …
Kubernetes 1.22: Server Side Apply moves to GA
By Jeffrey Ying (Google) Joe Betz (Google) | Friday, August 06, 2021 in Blog
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 …