Kubernetes Skill

Kubernetes debugging, security hardening, and infrastructure tooling. Covers pod triage, RBAC, network policies, and cobaltcore hypervisor components.

Reference Loading Table

| Signal | Reference | Size | |--------|-----------|------| | CrashLoopBackOff, OOMKilled, config error, health check, liveness probe, ImagePullBackOff, Pending, FailedScheduling | references/crash-diagnosis.md | ~140 lines | | service resolution, DNS, CoreDNS, port-forward, NetworkPolicy ingress/egress | references/network-debugging.md | ~50 lines | | CPU throttling, memory limit, OOMKill, ephemeral storage, DiskPressure, debug container | references/resource-debugging.md | ~100 lines | | RBAC, Role, RoleBinding, ClusterRole, ServiceAccount, least-privilege | references/rbac-patterns.md | ~60 lines | | PodSecurity, SecurityContext, runAsNonRoot, readOnlyRootFilesystem, restricted, baseline | references/pod-security.md | ~90 lines | | NetworkPolicy, default-deny, allow-list, namespace isolation | references/network-policies.md | ~70 lines | | cosign, Kyverno, OPA, admission controller, Sealed Secrets, External Secrets | references/supply-chain.md | ~120 lines | | kvm-exporter, metrics, prometheus, libvirt, hypervisor, collector, scrape, steal time, NUMA, cgroups, cloud hypervisor | references/cobalt-kvm-exporter.md | ~800 lines | | cobaltcore concurrency, goroutine, semaphore, TryLock | references/cobalt-concurrency-patterns.md | ~200 lines | | cobaltcore testing, mock, moq, Kind cluster | references/cobalt-testing-patterns.md | ~200 lines | | kubernetes debugging process, triage flow, diagnosis routing | references/kubernetes-debugging.md | ~50 lines | | kubernetes security process, RBAC + pod security + network hardening | references/kubernetes-security.md | ~50 lines | | cobaltcore overview, KVM exporter architecture, component identification | references/cobalt-core.md | ~50 lines |

Loading rule. Read the references whose signals match the task before responding.

Phase 1: TRIAGE

Determine which Kubernetes domain the request targets:

| Domain | Load references | Action | |--------|----------------|--------| | Pod failure, CrashLoop, OOM | crash-diagnosis, resource-debugging | Triage flow | | Network, DNS, service resolution | network-debugging, network-policies | Connectivity diagnosis | | RBAC, permissions, roles | rbac-patterns | Access control | | Pod hardening, container security | pod-security | Security posture | | Image signing, secrets, admission | supply-chain | Supply chain | | Cobaltcore / KVM exporter | kvm-exporter + cobalt refs | Component-specific |

Always specify -n <namespace> explicitly in every kubectl command.

Gate: Domain identified and relevant references loaded.

Phase 2: DIAGNOSE / RESPOND

For debugging: follow the triage flow — describe, logs, events, exec. Use read-only commands to gather evidence before proposing changes.

For security: provide concrete YAML manifests and specific configurations. Answer with reference-backed specifics, not generic advice.

For cobaltcore: use component-specific reference knowledge for architecture, metrics, configuration, and deployment details.

Gate: Specific, reference-backed diagnosis or response provided.

Phase 3: VERIFY

For debugging: confirm the fix resolves the symptom. For security: validate against the misconfiguration table in supply-chain.md. For cobaltcore: verify against component test patterns.