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Kubernetes - 3

2025 (12)

December (4)

k8s: Avoiding Zombie Cluster Members When Upgrading to etcd v3.6

Kubernetes Official Blog

2025-12-21

Upgrade to etcd v3.5.26 or later before moving to v3.6 to let etcd auto-sync membership data (v3store) from the legacy v2store and prevent removed nodes from reappearing as "zombie" members that can make the cluster inoperable.

k8s: Kubernetes 1.35: In-Place Pod Resize Graduates to Stable

Kubernetes Official Blog

2025-12-19

Kubernetes 1.35 graduates In-Place Pod Resize (In-Place Pod Vertical Scaling) to stable (GA). The feature makes CPU and memory requests and limits mutable on a running Pod (via a resize subresource), often without restarting containers. This enables non-disruptive resource adjustments, more powerful autoscaling (e.g., VPA InPlaceOrRecreate), transient boosts like CPU startup boost, and better resource efficiency. The release also adds prioritized retries, allows memory limit decreases (best-effort OOM protection), alpha support for Pod Level Resources, and new kubelet metrics/events. Work remains on runtime support, scheduler/kubelet races, expanded feature support, and integrations with autoscalers and other projects.

k8s: Kubernetes v1.35: Job Managed By Goes GA

Kubernetes Official Blog

2025-12-18

Kubernetes v1.35 promotes .spec.managedBy for Jobs to GA, enabling external controllers (e.g., MultiKueue) to take full responsibility for Job reconciliation and enabling multi-cluster batch scheduling patterns while leaving built-in Job controller behavior intact for other Jobs.

k8s: Kubernetes v1.35: Timbernetes (The World Tree Release)

Kubernetes Official Blog

2025-12-17

Kubernetes v1.35 ("Timbernetes / World Tree" release) ships 60 enhancements (17 stable, 19 beta, 22 alpha), focused on smoother nondisruptive scaling, native pod certificate-based workload identity, improved scheduling correctness, storage and topology improvements, and several important deprecations/removals. The release emphasizes stability, performance, and security hardening (notable GA features, new betas/alphas, and migration guidance for cgroup and containerd).

November (8)

k8s: Kubernetes v1.35 Sneak Peek

Kubernetes Official Blog

2025-11-26

Kubernetes v1.35 (planned 2025-12-17) introduces several deprecations and new/advanced features. Major removals/deprecations include cgroup v1 support removal, deprecation of kube-proxy ipvs mode, and final support for containerd v1.x (users must move to containerd 2.0+). Notable enhancements likely in v1.35 include node declared features (alpha), in-place Pod resource updates (GA), pod certificates (beta), numeric taint comparisons, continued progress on user namespaces, and image volumes becoming default.

k8s: Kubernetes Configuration Good Practices

Kubernetes Official Blog

2025-11-25

This article collects practical Kubernetes configuration best practices: prefer current stable APIs, keep manifests minimal and version-controlled, write YAML carefully (watch boolean values), group related objects, favor controllers (Deployments/Jobs) over naked Pods, use Services and DNS properly, avoid hostNetwork/hostPort unless necessary, apply semantic/common labels, add helpful annotations, and use kubectl features like applying directories, label selectors and server-side apply to simplify management.

azure: [Launched] Generally Available: Cluster-wide Cilium network policy with Azure CNI powered by Cilium for AKS

Azure Updates

2025-11-20

Azure announced General Availability of cluster-wide Cilium network policy for AKS clusters using Azure CNI powered by Cilium. The feature enables consistent, cluster-scoped network policy enforcement across Kubernetes namespaces, addressing a common challenge for platform teams and multi-tenant environments.

azure: [In preview] Public Preview: Azure Monitor for Azure Arc-enabled Kubernetes with OpenShift and Azure Red Hat OpenShift

Azure Updates

2025-11-20

Azure Monitor is available in public preview for Azure Arc-enabled Kubernetes clusters running OpenShift and Azure Red Hat OpenShift. It provides a complete set of monitoring services to track the health and performance of Kubernetes infrastructure layers and the applications that depend on them.

azure: [Launched] Generally Available: CSI Dynamic Provisioning for Azure Managed Lustre

Azure Updates

2025-11-19

Azure announces general availability of CSI Dynamic Provisioning for Azure Managed Lustre (AMLFS), allowing Kubernetes workloads to request AMLFS-backed persistent volumes on demand using standard StorageClass and PersistentVolumeClaim objects.

azure: [Launched] Generally Available: Pod sandboxing on AKS

Azure Updates

2025-11-18

Azure Kubernetes Service (AKS) now generally available: pod sandboxing. This feature allows containers to run in per-workload pod virtual machines (pod VMs) to improve isolation and security in shared environments.

azure: [Launched] Generally Available: Managed namespaces on AKS

Azure Updates

2025-11-18

Azure Kubernetes Service (AKS) now has Managed Namespaces generally available. The feature centralizes creation and management of Kubernetes namespaces across AKS clusters to reduce manual setup, lower the risk of misconfiguration, and simplify enforcement of tenant- and team-level configuration.

azure: [Launched] Generally Available: Application Gateway for Containers – Slow start

Azure Updates

2025-11-18

Slow start is now generally available for Application Gateway for Containers. The load balancing algorithm gradually increases traffic to newly created pods over a configurable window to improve stability and performance during backend scale‑up.