https://www.cloudkaramchari.com/tags/cgroup-v2/Recent content in Cgroup V2 on CloudkaramchariHugo -- gohugo.ioencloudkaramchariSat, 17 Oct 2026 12:30:00 +0530https://www.cloudkaramchari.com/blog/kubernetes-cgroup-v1-deprecation-fix-kubelet-not-starting-migrate-nodes-to-cgroup-v2/Sat, 17 Oct 2026 12:30:00 +0530https://www.cloudkaramchari.com/blog/kubernetes-cgroup-v1-deprecation-fix-kubelet-not-starting-migrate-nodes-to-cgroup-v2/ <h1 id="kubernetes-cgroup-v1-deprecation-fix-a-kubelet-that-wont-start-and-migrate-nodes-to-cgroup-v2">Kubernetes cgroup v1 Deprecation: Fix a Kubelet That Won't Start and Migrate Nodes to cgroup v2</h1> <p>You upgrade a node pool to Kubernetes 1.35 or later, the node never goes <code>Ready</code>, and <code>journalctl -u kubelet</code> shows the kubelet exiting on every restart with a line containing <code>kubelet is configured to not run on a host using cgroup v1</code>. Nothing in your manifests changed. What changed is a default: since Kubernetes v1.35 the kubelet setting <code>failCgroupV1</code> is <code>true</code>, so a node that still boots with cgroup v1 is refused outright. On October 6, 2026 the Kubernetes project published a long explainer on this shift. It is a good sign that the next step is coming: actual removal of cgroup v1 code is tracked in KEP-5573 and is planned for <strong>no earlier than v1.38</strong>.</p>