Core Track Guardrails-first chapter in core learning path.

Estimated Time

  • Reading: 20-25 min
  • Lab: 45-60 min
  • Quiz: 10-15 min

Prerequisites

Source Code References

  • deployment.yaml Members
  • develop/ Members
  • resourcequota.yaml Members

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What You Will Produce

A reproducible lab result plus quiz verification and incident-safe operating evidence.

Investigation

Start with scheduler behavior and events, not guesswork.

Safe investigation sequence:

  1. Inspect Pod Events: Look for OOMKilled, Throttling, and Evicted signals.
  2. Confirm QoS Class: Check the QoS class of the affected workloads.
  3. Compare Behavior: Compare the requests and limits against the real, observed behavior in Grafana or kubectl top.
  4. Identify Scope: Distinguish between a single noisy pod and broader, node-level pressure.

Containment

Containment is about restoring predictability to the cluster’s resource management.

Containment steps:

  1. Keep Definitions Explicit: Do not remove limits to “unblock” an OOM pod.
  2. Tune from Evidence: Adjust requests and limits based on the actual peak usage, not panic.
  3. Verify Quota Enforcement: Ensure that ResourceQuota and LimitRange are protecting neighboring namespaces.
  4. Test Before Promotion: Re-run the failure scenario in a lower environment before promoting the new sizing.

Pause and Predict: What automated guardrail would have prevented this incident entirely?