Kubernetes Blog

• Announcing the 2024 Steering Committee Election Results 2024-10-02
  The 2024 Steering Committee Election is now complete. The Kubernetes Steering Committee consists of 7 seats, 3 of which were up for election in 2024. Incoming committee members serve a term of 2 years, and all members are elected by the Kubernetes Community. This community body is significant since it oversees the governance of the […]
• Spotlight on CNCF Deaf and Hard-of-hearing Working Group (DHHWG) 2024-09-30
  In recognition of Deaf Awareness Month and the importance of inclusivity in the tech community, we are spotlighting Catherine Paganini, facilitator and one of the founding members of CNCF Deaf and Hard-of-Hearing Working Group (DHHWG). In this interview, Sandeep Kanabar, a deaf member of the DHHWG and part of the Kubernetes SIG ContribEx Communications team, […]
• Spotlight on SIG Scheduling 2024-09-24
  In this SIG Scheduling spotlight we talked with Kensei Nakada, an approver in SIG Scheduling. Introductions Arvind: Hello, thank you for the opportunity to learn more about SIG Scheduling! Would you like to introduce yourself and tell us a bit about your role, and how you got involved with Kubernetes? Kensei: Hi, thanks for the […]
• Kubernetes v1.31: kubeadm v1beta4 2024-08-23
  As part of the Kubernetes v1.31 release, kubeadm is adopting a new (v1beta4) version of its configuration file format. Configuration in the previous v1beta3 format is now formally deprecated, which means it's supported but you should migrate to v1beta4 and stop using the deprecated format. Support for v1beta3 configuration will be removed after a minimum […]
• Kubernetes v1.31: New Kubernetes CPUManager Static Policy: Distribute CPUs Across Cores 2024-08-22
  In Kubernetes v1.31, we are excited to introduce a significant enhancement to CPU management capabilities: the distribute-cpus-across-cores option for the CPUManager static policy. This feature is currently in alpha and hidden by default, marking a strategic shift aimed at optimizing CPU utilization and improving system performance across multi-core processors. Understanding the feature Traditionally, Kubernetes' CPUManager […]
• Kubernetes 1.31: Fine-grained SupplementalGroups control 2024-08-22
  This blog discusses a new feature in Kubernetes 1.31 to improve the handling of supplementary groups in containers within Pods. Motivation: Implicit group memberships defined in /etc/group in the container image Although this behavior may not be popular with many Kubernetes cluster users/admins, kubernetes, by default, merges group information from the Pod with information defined […]
• Kubernetes 1.31: Custom Profiling in Kubectl Debug Graduates to Beta 2024-08-22
  There are many ways of troubleshooting the pods and nodes in the cluster. However, kubectl debug is one of the easiest, highly used and most prominent ones. It provides a set of static profiles and each profile serves for a different kind of role. For instance, from the network administrator's point of view, debugging the […]
• Kubernetes 1.31: Autoconfiguration For Node Cgroup Driver (beta) 2024-08-21
  Historically, configuring the correct cgroup driver has been a pain point for users running new Kubernetes clusters. On Linux systems, there are two different cgroup drivers: cgroupfs and systemd. In the past, both the kubelet and CRI implementation (like CRI-O or containerd) needed to be configured to use the same cgroup driver, or else the […]
• Kubernetes 1.31: Streaming Transitions from SPDY to WebSockets 2024-08-20
  In Kubernetes 1.31, by default kubectl now uses the WebSocket protocol instead of SPDY for streaming. This post describes what these changes mean for you and why these streaming APIs matter. Streaming APIs in Kubernetes In Kubernetes, specific endpoints that are exposed as an HTTP or RESTful interface are upgraded to streaming connections, which require […]
• Kubernetes 1.31: Pod Failure Policy for Jobs Goes GA 2024-08-19
  This post describes Pod failure policy, which graduates to stable in Kubernetes 1.31, and how to use it in your Jobs. About Pod failure policy When you run workloads on Kubernetes, Pods might fail for a variety of reasons. Ideally, workloads like Jobs should be able to ignore transient, retriable failures and continue running to […]
• Kubernetes 1.31: Prevent PersistentVolume Leaks When Deleting out of Order 2024-08-16
  PersistentVolume (or PVs for short) are associated with Reclaim Policy. The reclaim policy is used to determine the actions that need to be taken by the storage backend on deletion of the PVC Bound to a PV. When the reclaim policy is Delete, the expectation is that the storage backend releases the storage resource allocated […]
• Kubernetes 1.31: MatchLabelKeys in PodAffinity graduates to beta 2024-08-16
  Kubernetes 1.29 introduced new fields matchLabelKeys and mismatchLabelKeys in podAffinity and podAntiAffinity. In Kubernetes 1.31, this feature moves to beta and the corresponding feature gate (MatchLabelKeysInPodAffinity) gets enabled by default. matchLabelKeys - Enhanced scheduling for versatile rolling updates During a workload's (e.g., Deployment) rolling update, a cluster may have Pods from multiple versions at the […]
• Kubernetes 1.31: Read Only Volumes Based On OCI Artifacts (alpha) 2024-08-16
  The Kubernetes community is moving towards fulfilling more Artificial Intelligence (AI) and Machine Learning (ML) use cases in the future. While the project has been designed to fulfill microservice architectures in the past, it’s now time to listen to the end users and introduce features which have a stronger focus on AI/ML. One of these […]
• Kubernetes v1.31: Accelerating Cluster Performance with Consistent Reads from Cache 2024-08-15
  Kubernetes is renowned for its robust orchestration of containerized applications, but as clusters grow, the demands on the control plane can become a bottleneck. A key challenge has been ensuring strongly consistent reads from the etcd datastore, requiring resource-intensive quorum reads. Today, the Kubernetes community is excited to announce a major improvement: consistent reads from […]
• Kubernetes 1.31: VolumeAttributesClass for Volume Modification Beta 2024-08-15
  Volumes in Kubernetes have been described by two attributes: their storage class, and their capacity. The storage class is an immutable property of the volume, while the capacity can be changed dynamically with volume resize. This complicates vertical scaling of workloads with volumes. While cloud providers and storage vendors often offer volumes which allow specifying […]
• Kubernetes v1.31: PersistentVolume Last Phase Transition Time Moves to GA 2024-08-14
  Announcing the graduation to General Availability (GA) of the PersistentVolume lastTransitionTime status field, in Kubernetes v1.31! The Kubernetes SIG Storage team is excited to announce that the "PersistentVolumeLastPhaseTransitionTime" feature, introduced as an alpha in Kubernetes v1.28, has now reached GA status and is officially part of the Kubernetes v1.31 release. This enhancement helps Kubernetes users […]
• Kubernetes 1.31: Moving cgroup v1 Support into Maintenance Mode 2024-08-14
  As Kubernetes continues to evolve and adapt to the changing landscape of container orchestration, the community has decided to move cgroup v1 support into maintenance mode in v1.31. This shift aligns with the broader industry's move towards cgroup v2, offering improved functionalities: including scalability and a more consistent interface. Before we dive into the consequences […]
• Kubernetes v1.31: Elli 2024-08-13
  Editors: Matteo Bianchi, Yigit Demirbas, Abigail McCarthy, Edith Puclla, Rashan Smith Announcing the release of Kubernetes v1.31: Elli! Similar to previous releases, the release of Kubernetes v1.31 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 […]
• Introducing Feature Gates to Client-Go: Enhancing Flexibility and Control 2024-08-12
  Kubernetes components use on-off switches called feature gates to manage the risk of adding a new feature. The feature gate mechanism is what enables incremental graduation of a feature through the stages Alpha, Beta, and GA. Kubernetes components, such as kube-controller-manager and kube-scheduler, use the client-go library to interact with the API. The same library […]
• Spotlight on SIG API Machinery 2024-08-07
  We recently talked with Federico Bongiovanni (Google) and David Eads (Red Hat), Chairs of SIG API Machinery, to know a bit more about this Kubernetes Special Interest Group. Introductions Frederico (FSM): Hello, and thank your for your time. To start with, could you tell us about yourselves and how you got involved in Kubernetes? David: […]