Kubernetes
496 briefings in the desk
How to Handle Data Duplication in Data-Heavy Kubernetes Environments
Why Duplicate Data? It’s convenient to create a copy of your application with a copy of its state for each team. For example, you might want a separate database copy to test some significant schema changes or develop other disruptive…
Spotlight on SIG Node
Introduction In Kubernetes, a Node is a representation of a single machine in your cluster. SIG Node owns that very important Node component and supports various subprojects such as Kubelet, Container Runtime Interface (CRI) and more to…
Introducing Single Pod Access Mode for PersistentVolumes
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…
Alpha in Kubernetes v1.22: API Server Tracing
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…
Kubernetes 1.22: A New Design for Volume Populators
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
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…
Enable seccomp for all workloads with a new v1.22 alpha feature
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)…
Alpha in v1.22: Windows HostProcess Containers
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…
Kubernetes Memory Manager moves to beta
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…
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…
Kubernetes 1.22: CSI Windows Support (with CSI Proxy) reaches GA
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 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 1.22: Reaching New Peaks
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…
Roorkee robots, releases and racing: the Kubernetes 1.21 release interview
With Kubernetes 1.22 due out next week, now is a great time to look back on 1.21. The release team for that version was led by Nabarun Pal from VMware. Back in April I interviewed Nabarun on the weekly Kubernetes Podcast from Google; the…
Updating NGINX-Ingress to use the stable Ingress API
With all Kubernetes APIs, there is a process to creating, maintaining, and ultimately deprecating them once they become GA. The networking.k8s.io API group is no different. The upcoming Kubernetes 1.22 release will remove several…
Kubernetes Release Cadence Change: Here’s What You Need To Know
On April 23, 2021, the Release Team merged a Kubernetes Enhancement Proposal (KEP) changing the Kubernetes release cycle from four releases a year (once a quarter) to three releases a year. This blog post provides a high level overview…
Spotlight on SIG Usability
SIG Usability, which is featured in this Spotlight blog, has been deprecated and is no longer active. As a result, the links and information provided in this blog post may no longer be valid or relevant. Should there be renewed interest…
Kubernetes API and Feature Removals In 1.22: Here’s What You Need To Know
As the Kubernetes API evolves, APIs are periodically reorganized or upgraded. When APIs evolve, the old APIs they replace are deprecated, and eventually removed. See Kubernetes API removals to read more about Kubernetes' policy on removing…
Announcing Kubernetes Community Group Annual Reports
Given the growth and scale of the Kubernetes project, the existing reporting mechanisms were proving to be inadequate and challenging. Kubernetes is a large open source project. With over 100000 commits just to the main k/kubernetes…
Writing a Controller for Pod Labels
Operators are proving to be an excellent solution to running stateful distributed applications in Kubernetes. Open source tools like the Operator SDK provide ways to build reliable and maintainable operators, making it easier to extend…
Using Finalizers to Control Deletion
Deleting objects in Kubernetes can be challenging. You may think you’ve deleted something, only to find it still persists. While issuing a kubectl delete command and hoping for the best might work for day-to-day operations, understanding…
Kubernetes 1.21: Metrics Stability hits GA
Kubernetes 1.21 marks the graduation of the metrics stability framework and along with it, the first officially supported stable metrics. Not only do stable metrics come with supportability guarantees, the metrics stability framework…
Evolving Kubernetes networking with the Gateway API
The Ingress resource is one of the many Kubernetes success stories. It created a diverse ecosystem of Ingress controllers which were used across hundreds of thousands of clusters in a standardized and consistent way. This standardization…
Graceful Node Shutdown Goes Beta
Graceful node shutdown, beta in 1.21, enables kubelet to gracefully evict pods during a node shutdown. Kubernetes is a distributed system and as such we need to be prepared for inevitable failures — nodes will fail, containers might crash…