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Kubernetes is moving away from cgroup v1 toward v2

kubernetes.io 11 min read Editor score 7/10

Kubernetes moved cgroup v1 management into maintenance in v1.31, and v1.35 defaults to refusing startup on cgroup v1 nodes unless overridden. Teams should plan node migration before upgrading.

What

Kubernetes is deprecating cgroup v1 and moving toward cgroup v2 for Linux node resource management.

How

In Kubernetes v1.35, failCgroupV1 defaults to true, so the kubelet does not start on a cgroup v1 node unless overridden.

Why it matters

Engineers should migrate Linux nodes before upgrading; cgroup v2 also enables the memory controller features used by Memory QoS.

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