Kubernetes Blog

• Kubernetes v1.33: User Namespaces enabled by default! 2025-04-25
  In Kubernetes v1.33 support for user namespaces is enabled by default. This means that, when the stack requirements are met, pods can opt-in to use user namespaces. To use the feature there is no need to enable any Kubernetes feature flag anymore! In this blog post we answer some common questions about user namespaces. But, […]
• Continuing the transition from Endpoints to EndpointSlices 2025-04-24
  Since the addition of EndpointSlices (KEP-752) as alpha in v1.15 and later GA in v1.21, the Endpoints API in Kubernetes has been gathering dust. New Service features like dual-stack networking and traffic distribution are only supported via the EndpointSlice API, so all service proxies, Gateway API implementations, and similar controllers have had to be ported […]
• Kubernetes v1.33: Octarine 2025-04-23
  Editors: Agustina Barbetta, Aakanksha Bhende, Udi Hofesh, Ryota Sawada, Sneha Yadav Similar to previous releases, the release of Kubernetes v1.33 introduces new stable, beta, and alpha features. The consistent delivery of high-quality releases underscores the strength of our development cycle and the vibrant support from our community. This release consists of 64 enhancements. Of those […]
• Kubernetes Multicontainer Pods: An Overview 2025-04-22
  As cloud-native architectures continue to evolve, Kubernetes has become the go-to platform for deploying complex, distributed systems. One of the most powerful yet nuanced design patterns in this ecosystem is the sidecar pattern—a technique that allows developers to extend application functionality without diving deep into source code. The origins of the sidecar pattern Think of […]
• Introducing kube-scheduler-simulator 2025-04-07
  The Kubernetes Scheduler is a crucial control plane component that determines which node a Pod will run on. Thus, anyone utilizing Kubernetes relies on a scheduler. kube-scheduler-simulator is a simulator for the Kubernetes scheduler, that started as a Google Summer of Code 2021 project developed by me (Kensei Nakada) and later received a lot of […]
• Kubernetes v1.33 sneak peek 2025-03-26
  As the release of Kubernetes v1.33 approaches, the Kubernetes project continues to evolve. Features may be deprecated, removed, or replaced to improve the overall health of the project. This blog post outlines some planned changes for the v1.33 release, which the release team believes you should be aware of to ensure the continued smooth operation […]
• Fresh Swap Features for Linux Users in Kubernetes 1.32 2025-03-25
  Swap is a fundamental and an invaluable Linux feature. It offers numerous benefits, such as effectively increasing a node’s memory by swapping out unused data, shielding nodes from system-level memory spikes, preventing Pods from crashing when they hit their memory limits, and much more. As a result, the node special interest group within the Kubernetes […]
• Ingress-nginx CVE-2025-1974: What You Need to Know 2025-03-24
  Today, the ingress-nginx maintainers have released patches for a batch of critical vulnerabilities that could make it easy for attackers to take over your Kubernetes cluster. If you are among the over 40% of Kubernetes administrators using ingress-nginx, you should take action immediately to protect your users and data. Background Ingress is the traditional Kubernetes […]
• Introducing JobSet 2025-03-23
  Authors: Daniel Vega-Myhre (Google), Abdullah Gharaibeh (Google), Kevin Hannon (Red Hat) In this article, we introduce JobSet, an open source API for representing distributed jobs. The goal of JobSet is to provide a unified API for distributed ML training and HPC workloads on Kubernetes. Why JobSet? The Kubernetes community’s recent enhancements to the batch ecosystem […]
• Spotlight on SIG Apps 2025-03-12
  In our ongoing SIG Spotlight series, we dive into the heart of the Kubernetes project by talking to the leaders of its various Special Interest Groups (SIGs). This time, we focus on SIG Apps, the group responsible for everything related to developing, deploying, and operating applications on Kubernetes. Sandipan Panda (DevZero) had the opportunity to […]
• Spotlight on SIG etcd 2025-03-04
  In this SIG etcd spotlight we talked with James Blair, Marek Siarkowicz, Wenjia Zhang, and Benjamin Wang to learn a bit more about this Kubernetes Special Interest Group. Introducing SIG etcd Frederico: Hello, thank you for the time! Let’s start with some introductions, could you tell us a bit about yourself, your role and how […]
• NFTables mode for kube-proxy 2025-02-28
  A new nftables mode for kube-proxy was introduced as an alpha feature in Kubernetes 1.29. Currently in beta, it is expected to be GA as of 1.33. The new mode fixes long-standing performance problems with the iptables mode and all users running on systems with reasonably-recent kernels are encouraged to try it out. (For compatibility […]
• The Cloud Controller Manager Chicken and Egg Problem 2025-02-14
  Kubernetes 1.31 completed the largest migration in Kubernetes history, removing the in-tree cloud provider. While the component migration is now done, this leaves some additional complexity for users and installer projects (for example, kOps or Cluster API) . We will go over those additional steps and failure points and make recommendations for cluster owners. This […]
• Spotlight on SIG Architecture: Enhancements 2025-01-21
  This is the fourth interview of a SIG Architecture Spotlight series that will cover the different subprojects, and we will be covering SIG Architecture: Enhancements. In this SIG Architecture spotlight we talked with Kirsten Garrison, lead of the Enhancements subproject. The Enhancements subproject Frederico (FSM): Hi Kirsten, very happy to have the opportunity to talk […]
• Kubernetes 1.32: Moving Volume Group Snapshots to Beta 2024-12-18
  Volume group snapshots were introduced as an Alpha feature with the Kubernetes 1.27 release. The recent release of Kubernetes v1.32 moved that support to beta. The support for volume group snapshots relies on a set of extension APIs for group snapshots. These APIs allow users to take crash consistent snapshots for a set of volumes. […]
• Enhancing Kubernetes API Server Efficiency with API Streaming 2024-12-17
  Managing Kubernetes clusters efficiently is critical, especially as their size is growing. A significant challenge with large clusters is the memory overhead caused by list requests. In the existing implementation, the kube-apiserver processes list requests by assembling the entire response in-memory before transmitting any data to the client. But what if the response body is […]
• Kubernetes v1.32 Adds A New CPU Manager Static Policy Option For Strict CPU Reservation 2024-12-16
  In Kubernetes v1.32, after years of community discussion, we are excited to introduce a strict-cpu-reservation option for the CPU Manager static policy. This feature is currently in alpha, with the associated policy hidden by default. You can only use the policy if you explicitly enable the alpha behavior in your cluster. Understanding the feature The […]
• Kubernetes v1.32: Memory Manager Goes GA 2024-12-13
  With Kubernetes 1.32, the memory manager has officially graduated to General Availability (GA), marking a significant milestone in the journey toward efficient and predictable memory allocation for containerized applications. Since Kubernetes v1.22, where it graduated to beta, the memory manager has proved itself reliable, stable and a good complementary feature for the CPU Manager. As […]
• Kubernetes v1.32: QueueingHint Brings a New Possibility to Optimize Pod Scheduling 2024-12-12
  The Kubernetes scheduler is the core component that selects the nodes on which new Pods run. The scheduler processes these new Pods one by one. Therefore, the larger your clusters, the more important the throughput of the scheduler becomes. Over the years, Kubernetes SIG Scheduling has improved the throughput of the scheduler in multiple enhancements. […]
• Kubernetes v1.32: Penelope 2024-12-11
  Editors: Matteo Bianchi, Edith Puclla, William Rizzo, Ryota Sawada, Rashan Smith Announcing the release of Kubernetes v1.32: Penelope! In line with previous releases, the release of Kubernetes v1.32 introduces new stable, beta, and alpha features. The consistent delivery of high-quality releases underscores the strength of our development cycle and the vibrant support from our community. […]