Be Ready for Kubernetes 1.35
The biggest Kubernetes release of 2025 is coming. Don't get caught off guard by breaking changes.
Release: December 17, 2025
Kubernetes 1.35 Cheat Sheet
Your guide to mandatory cgroup v2, AI/ML scheduler primitives, and structured authentication. Everything you need in one place.
Starting in 1.35, kubelet will fail to start on nodes running cgroup v1. Ensure all nodes are migrated before upgrading.
This is the last release supporting containerd 1.x. Plan your container runtime upgrade path now.
Pods can now have their CPU/memory requests and limits changed without restart. Enabled by default.
Hot-swap OIDC providers without API server restart. Configure multiple identity providers simultaneously.
Schedule pod groups atomically - all pods start together or none do. Essential for distributed ML training.
Pods run as root inside container but unprivileged on host. Major security improvement for multi-tenant clusters.
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Why You Need This Cheat Sheet
Breaking Changes
cgroup v1 is disabled by default - kubelet will crash on older nodes. containerd 1.x support ends. Know what to fix before you upgrade.
New GA Features
In-place pod scaling is finally stable. Resize CPU and memory without restarts. Structured authentication enables hot-swap OIDC.
AI/ML Scheduling
Native gang scheduling for distributed training. DRA binding conditions for GPU initialization. Built for expensive hardware.
Migration Checklist
Step-by-step checklist to prepare your clusters. kubectl commands to verify compatibility. Feature gate reference table.