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CKA study material · question 584 of 1000

A node runs containerd configured with the systemd cgroup driver, but the kubelet was left at its default. What must be changed?

  1. containerd should be switched to cgroupfs to match the kubelet
  2. The kubelet's cgroupDriver must be set to systemd to match the runtime
  3. cgroupsPerQOS must be disabled on the kubelet
  4. Nothing; the kubelet detects the runtime's driver automatically
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Answer: B. The kubelet's cgroupDriver must be set to systemd to match the runtime

The kubelet's cgroupDriver defaults to cgroupfs and must be configured to systemd when the container runtime uses the systemd driver, or the two manage the cgroup hierarchy inconsistently.

Source: Reserve Compute Resources for System Daemons (Kubernetes) — Node Allocatable › Configuring a cgroup driver

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