k8s-cilium-troubleshooting SKILL.md skillA
k8s-cilium-troubleshooting from k8s-servant/k8s-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add k8s-servant/k8s-skills/k8s-cilium-troubleshooting@git:20261031.7e95e4fPins git:20261031.7e95e4f in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- k8s-servant/k8s-skills
- Path
skills/k8s-cilium-troubleshooting/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261031.7e95e4f, committed Oct 31, 2026
- First version recorded
- Oct 24, 2026
- Size
- 9,207 bytes
- Repository stars
- 35
- License
- Apache-2.0
Use when networking fails on a Kubernetes cluster that runs Cilium as its CNI: traffic between pods dropped or timing out after a CiliumNetworkPolicy or CiliumClusterwideNetworkPolicy, "Policy denied" drops in Hubble, DNS that stops resolving after an egress policy, HTTP 403 "Access denied" from an L7 rule, toFQDNs rules that do not match, pods stuck ContainerCreating with "unable to connect to Cilium agent", Cilium agent or operator pods not ready, CiliumEndpoints not ready, or IPAM exhaustion.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Cilium troubleshooting Find out why traffic fails on a cluster that runs Cilium, and propose a fix. **Read first, ask before changing.** Run the investigation commands freely. Run a command under an "Ask first" line only after the user approves that exact command; if your credentials do not allow it, give it to the user to run. Never run a "Proposed fix"; hand it to the user. Cilium gives each pod a **CiliumEndpoint** with a security **identity** derived from its labels, and enforces Kubernetes NetworkPolicies, **CiliumNetworkPolicies** (one namespace) and **CiliumClusterwideNetworkPolicies** by identity. Once any policy selects an endpoint for a direction (ingress or egress), only what some policy allows gets through in that direction. L7 rules (HTTP, DNS) send the traffic through Cilium's Envoy proxy. **Hubble** records each flow with its verdict. The commands use placeholders: `my-namespace`, `my-app` (the server) and `my-web` (the client), `my-policy`, and `cilium-xxxxx` (the Cilium agent pod on the node of the pod you investigate). Replace them with the real names. The built-in `view` role cannot read …
Read the whole file at its exact version.
How to install
mdr add k8s-servant/k8s-skills/k8s-cilium-troubleshooting@sha256:a4f2fcc45be82701The line at the top of this page pins the label git:20261031.7e95e4f, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_vnsu4xhwlrxtbo35)
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Versions
The registry has recorded 2 versions of this file, between Oct 24, 2026 and Oct 31, 2026, about one every 7 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261031.7e95e4f latest | 2026-10-31 | 7e95e4f | 9,207 B | A | view · diff |
| git:20261024.3d5858f | 2026-10-24 | 3d5858f | 9,058 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (9207 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
k8s-servant/k8s-skills · 35 stars · license Apache-2.0 · pushed 2026-10-31 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_vnsu4xhwlrxtbo35 GET https://markdownregistry.com/api/v1/resolve?ref=k8s-servant/k8s-skills/k8s-cilium-troubleshooting GET https://markdownregistry.com/api/v1/blob/a4f2fcc45be827014518c2d4046fb4bca29ba94f184c99a2bf8a6cd4cf42224a
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.