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Kubernetes OOMKilled Troubleshooting Guide
A practical Kubernetes OOMKilled troubleshooting guide using kubectl describe, previous logs, events, metrics, requests, limits, QoS, and node memory pressure.
Infrastructure as Code Security
At what point in the Terraform workflow are Sentinel (or similar policy-as-code) checks evaluated, and why does that timing matter?
Policy checks evaluate against the plan, the output of `terraform plan`, before `terraform apply` actually provisions anything, which means a policy violation blocks the run from proceeding to apply at all. Evaluating against the plan rather than the already-applied state is what makes this a preventive control instead of a detective one; the non-compliant resource is stopped before it exists, not flagged for cleanup afterward once it's already live and potentially already been exploited or has already incurred cost.