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hyperpod-node-debugger

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Diagnose and remediate per-node issues on a HyperPod cluster (EKS or Slurm) — a specific node is unhealthy, unresponsive, stuck, or needs replacing. Covers on-node EFA, GPU / accelerator hardware (XID, ECC, NVLink, row-remap, DCGM), Slurm node down/drained, disk and memory pressure, per-node lifecycle-script failures, SSM agent, container runtime, kernel panics, pod networking. Read-only. Not for cluster-wide provisioning (→ hyperpod-cluster-debugger), NCCL (→ hyperpod-nccl), or MFU (→ hyperpod-mfu-debugger).

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

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Nov 5, 2026
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# HyperPod Node 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. Destructive order: **investigate → reboot → replace** (replace destroys root + secondary volumes; not supported on Slurm controller nodes). Never discard training state, logs, or caches on speculation.

**IaC note (always include with mutation commands).** When you suggest any command that changes cluster, VPC, SG, subnet, or EKS configuration (e.g. `authorize-security-group-*`, `modify-vpc-attribute`, `update-cluster`, `kubectl label/cordon/drain`, `create namespace`, `set env daemonset`), ask the customer first whether the cluster / VPC / SG is managed by Infrastructure-as-Code (CloudFormation, CDK, Terraform, Pulumi). If yes, tell them: "Apply this change in your IaC source first, then deploy through the pipeline — running the command directly will drift from your template and the next stack update may overwrite it." If they need to fix the issue immediately and the IaC change will follow, flag the drift explicitly so they remember to reconcile.

Read-only triage. `scripts/triage-cluster.sh` (and helpers `check-efa-sg.sh`, `check-node-reachability.sh`, `check-vpc-config.sh`) read state and print each issue as `[FAIL] ... → references/node-diagnostics-detail.md § <section>`. Catalog of customer-ticket patterns: [references/node-issue-catalog.md](references/node-issue-catalog.md).

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## Workflow

1. Collect cluster name, region, suspect instance ID, exact error string from logs.
2. Run `scripts/triage-cluster.sh` (add `--node <INSTANCE-ID>` to focus one node).