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hyperpod-cluster-debugger

Diagnose and remediate cluster-wide HyperPod (EKS or Slurm) problems — creation / deployment failures (CloudFormation, EFA health check, lifecycle scripts, capacity), EKS access, node replacement, CloudFormation nested-stack errors, post-maintenance rollback state, dangling nodes, autoscaler conflicts. Includes `--validate` pre-flight. Read-only.

plugins/sagemaker-ai/skills/hyperpod-cluster-debugger/SKILL.md

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Nov 5, 2026
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Apache-2.0

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# HyperPod Cluster Debugger

**Operating policy.** Run read-only diagnostics yourself. Never run a command that changes cluster, node, or workload state — present each one as a **Suggested command (run this yourself)** block and wait for the customer to run it. Destructive order: **investigate → reboot → replace** (replace destroys root + secondary volumes; not supported on Slurm controller nodes).

**Before any state-changing CLI: ask if it's IaC-managed.** HyperPod clusters, SGs, EKS access entries, and IAM are usually provisioned via CloudFormation / CDK / Terraform. If yes, the fix belongs in IaC — running the CLI will drift and the next deploy reverts it. Use the CLI only when IaC is unavailable (locked out, predates IaC, mid-review).

`scripts/diagnose-cluster.sh` is read-only: it collects state via AWS APIs (and SSM for Slurm controller health) and prints each issue as `[FAIL] ... → references/<file>.md § <section>`.

| Reference                                                                 | Open when                                                           |
| ------------------------------------------------------------------------- | ------------------------------------------------------------------- |
| [cluster-diagnostics-detail.md](references/cluster-diagnostics-detail.md) | Per-finding remediation runbook (§ A–L)                             |
| [cluster-operations.md](references/cluster-operations.md)                 | Operational deep-dives (EFA SG, EKS access, SSM, Slurm, filesystem) |
| [cloudformation-errors.md](references/cloudformation-errors.md)           | § H needs the full per-resource CFN error catalog                   |
| [capacity-planning.md](references/capacity-planning.md)                   | § B or `--validate` flags capacity / subnet sizing                  |