Triage EKS Node NotReady

Triage EKS Node NotReady is a skill for Claude Code, Codex from bregman-arie/devops-sre-skills. It costs 22 tokens per session (444 once invoked), scanned A, original, Apache-2.0.

A troubleshooting procedure for Amazon Elastic Kubernetes Service (EKS) worker nodes marked NotReady, meaning Kubernetes cannot reliably use them to run workloads.

In plain words
What is it for?
Use it to inspect node conditions, kubelet events, networking, AWS instance health, scaling activity, and the Amazon VPC Container Network Interface (CNI), then choose whether to wait, drain, replace, or roll back changes.
Why use it?
It helps distinguish a single unhealthy machine from wider networking, permissions, image, or rollout problems before draining or replacing nodes.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to inspect node conditions, kubelet events, networking, AWS instance health, scaling activity, and the Amazon VPC Container Network Interface (CNI), then choose whether to wait, drain, replace, or roll back changes.

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Install with agentmods
npx agentmods add skills/bregman-arie/devops-sre-skills/triage-eks-node-notready
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add bregman-arie/devops-sre-skills --skill triage-eks-node-notready
Clone the repo
git clone --depth 1 https://github.com/bregman-arie/devops-sre-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for Triage EKS Node NotReady

README.md
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Your own site
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Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for Triage EKS Node NotReady

Your own site · 80×15
<a href="https://agentmods.dev/skills/bregman-arie/devops-sre-skills/triage-eks-node-notready"><img src="https://agentmods.dev/badge/skills/bregman-arie/devops-sre-skills/triage-eks-node-notready.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 22 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 444 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00022 $0.00444
Opus 5 $0.00011 $0.00222
Sonnet 5 $0.00004 $0.00089
Haiku 4.5 $0.00002 $0.00044

Measured 10d ago against content hash 85a7fe58b070, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

Triage EKS Node NotReady scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/aws/triage-eks-node-notready/SKILL.md · 67 lines

What it actually says

When to use

Use when EKS nodes show NotReady, Unknown, or pods cannot schedule due to node health.

Preconditions

  • You can access Kubernetes node status and AWS instance health.

Procedure

  1. Confirm which nodes are affected and whether it is a single nodegroup/az.
  2. Inspect node conditions and kubelet-related events.
  3. Identify whether the node is reachable and if CNI is failing.
  4. Check EC2 instance status checks and recent scaling events.
  5. Decide between waiting, draining, or replacing the node.

Decision points

  • Single node failure: drain/replace after confirming workloads can move.
  • Many nodes in same nodegroup/az: suspect networking, IAM, AMI, or a rollout.
  • CNI failure symptoms: verify VPC CNI health and ENI/IP exhaustion.

Verification

  • Nodes return to Ready or are replaced and the new nodes are Ready.
  • Pending pods schedule and workload health stabilizes.

Rollback / undo

  • Revert recent nodegroup/AMI/config changes if correlated.
  • If replacement worsens impact, pause nodegroup rollouts.

Escalation

  • Platform team for cluster-wide networking/CNI issues.
  • AWS support if underlying EC2 issues persist.

Examples

kubectl get nodes
kubectl describe node <node>
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 10d ago First seen · 67 lines · 22 tokens per session scan A 85a7fe58b070

Subscribe to this mod's changes

Triage EKS Node NotReady is a skill published in the GitHub repository bregman-arie/devops-sre-skills (22 stars, last pushed 5mo ago), licensed Apache-2.0. It adds 22 tokens to every session and 444 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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