커스텀 리소스 정의(CRD)는 Kubernetes 기능을 확장하는 강력한 도구입니다.
하지만 CRD의 변환 웹훅 구성 spec.conversion.webhook.clientConfig.caBundle에 유효하지 않거나 형식이 잘못된 인증 기관(CA) 번들이 포함되어 있으면 클러스터 작업이 중단될 수 있습니다. 이는 리소스 생성, 업데이트 또는 삭제 중의 오류로 이어질 수 있습니다. Google Kubernetes Engine(GKE)은 클러스터를 모니터링하고 추천자 서비스를 사용하여 플랫폼 사용량을 최적화하는 방법을 안내합니다.
클러스터의 안정성과 성능을 유지하려면 작동하지만 CA 번들이 유효하지 않은 CRD에 대한 GKE의 권장사항을 참고하세요. 이 안내에 따라 잘못 구성되었을 수 있는 CRD를 확인하고 필요한 경우 업데이트하세요. 통계 및 추천을 관리하는 방법에 대한 자세한 내용은 통계 및 추천으로 GKE 사용 최적화를 참조하세요.
영향을 받는 클러스터 식별
잘못된 CA 번들이 있는 CRD의 영향을 받는 클러스터를 식별하는 통계를 확인하려면 하위 유형 K8S_CRD_WITH_INVALID_CA_BUNDLE에 대한 통계 및 추천 보기 안내를 따르세요. 다음과 같은 방법으로 통계를 확인할 수 있습니다.
Google Cloud 콘솔 사용하기
Google Cloud CLI 또는 Recommender API를 사용하여 하위 유형 K8S_CRD_WITH_INVALID_CA_BUNDLE로 필터링하기
GKE 클러스터에 spec.conversion.webhook.clientConfig의 웹훅 클라이언트 구성에 대해 잘못 구성된 caBundle을 보고하는 CRD가 하나 이상 있는 경우 GKE는 K8S_CRD_WITH_INVALID_CA_BUNDLE 하위 유형으로 통계와 추천을 생성합니다.
[[["이해하기 쉬움","easyToUnderstand","thumb-up"],["문제가 해결됨","solvedMyProblem","thumb-up"],["기타","otherUp","thumb-up"]],[["이해하기 어려움","hardToUnderstand","thumb-down"],["잘못된 정보 또는 샘플 코드","incorrectInformationOrSampleCode","thumb-down"],["필요한 정보/샘플이 없음","missingTheInformationSamplesINeed","thumb-down"],["번역 문제","translationIssue","thumb-down"],["기타","otherDown","thumb-down"]],["최종 업데이트: 2025-09-01(UTC)"],[],[],null,["# Troubleshoot CRDs with an invalid CA bundle\n\n[Autopilot](/kubernetes-engine/docs/concepts/autopilot-overview) [Standard](/kubernetes-engine/docs/concepts/choose-cluster-mode)\n\n*** ** * ** ***\n\n[Custom Resource\nDefinitions](https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/)\n(CRDs) are powerful tools for [extending Kubernetes\ncapabilities](https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions/).\nHowever, if a CRD contains an invalid or malformed Certificate Authority (CA)\nbundle within its conversion webhook configuration\n`spec.conversion.webhook.clientConfig.caBundle`, it can disrupt cluster\noperations. This can manifest as errors during resource creation, updates, or\ndeletions. Google Kubernetes Engine (GKE) monitors your clusters and uses the\nRecommender service to deliver guidance for how you can optimize your usage of\nthe platform.\n\nTo help you ensure that your cluster remains stable and\nperformant, see recommendations from GKE for CRDs that operate but\nhave an invalid CA bundle. Use this guidance to check your potentially misconfigured CRDs and update them, if necessary. To learn more about how to manage insights and recommendations from\nRecommenders, see [Optimize your usage of GKE with insights and\nrecommendations](/kubernetes-engine/docs/how-to/optimize-with-recommenders).\n\nIdentify impacted clusters\n--------------------------\n\nTo get insights identifying clusters that are affected by CRDs with invalid CA bundles, follow\nthe instructions to [view insights and recommendations](/kubernetes-engine/docs/how-to/optimize-with-recommenders#view-insights-recs) for subtype `K8S_CRD_WITH_INVALID_CA_BUNDLE`. You can get insights in\nthe following ways:\n\n- Use the Google Cloud console.\n- Use the Google Cloud CLI, or the Recommender API, filtering with the subtype `K8S_CRD_WITH_INVALID_CA_BUNDLE`.\n\nAfter you identify the CRDs using the insights, follow the instructions to\n[troubleshoot the misconfigured CA bundle](#troubleshoot-crds).\n\nWhen GKE detects misconfigured CRDs\n-----------------------------------\n\nGKE generates an insight and recommendation with the\n`K8S_CRD_WITH_INVALID_CA_BUNDLE` subtype if the GKE cluster has\none or more CRDs reporting a misconfigured `caBundle` for the webhook client\nconfiguration in `spec.conversion.webhook.clientConfig`.\n\nFollow the instructions to [check CRDs with misconfigured CA bundle](#check-invalid-caBundle).\n\nTroubleshoot the detected CRDs\n------------------------------\n\nThe following sections have instructions for you to troubleshoot the CRDs that\nGKE detected as potentially misconfigured.\n\nAfter you implement the instructions and the CRDs are correctly configured, the\nrecommendation is resolved within 24 hours and no longer appears in the console.\nIf it has been less than 24 hours since you've implemented the guidance of the\nrecommendation, you can [mark the recommendation as\nresolved](/kubernetes-engine/docs/how-to/optimize-with-recommenders#resolve-recommendation).\nIf you don't want to implement the recommendation, you can [dismiss\nit](/kubernetes-engine/docs/how-to/optimize-with-recommenders#dismiss-recommendation).\n\n### Identify affected CRDs in a cluster\n\n1. [View insights and\n recommendations](/kubernetes-engine/docs/how-to/optimize-with-recommenders#view-insights-recs) for subtype `K8S_CRD_WITH_INVALID_CA_BUNDLE`,\n choosing one insight at a time to troubleshoot. GKE generates\n one insight per cluster which has a broken CRD.\n\n2. Run the following command to describe the Service to find CRDs with\n potentially problematic CA bundles:\n\n kubectl get crd -o custom-columns=NAME:.metadata.name,CABUNDLE:.spec.conversion.webhook.clientConfig.caBundle\n\n The output includes the following:\n - **Name**: The name of the CRD.\n - **CaBundle**: The CA bundle associated with the CRD's conversion webhook, if present. Examine the output. If the caBundle column is empty for a CRD that you know utilizes a conversion webhook, this signals a potential issue with the caBundle.\n\n### Recreate the CRD\n\nTo resolve this error, recreate the affected CRD with a valid CA bundle:\n\n1. Back up existing custom resources associated with this problematic\n CRD, if you have any. Run the following command to export the existing\n resources:\n\n kubectl get \u003ccrd-name\u003e -o yaml \u003e backup.yaml\n\n2. Delete the existing CRD:\n\n kubectl delete crd \u003ccrd-name\u003e\n\n3. Ensure that the `caBundle` field of the CRD contains a well-formed,\n base-64-encoded PEM certificate. You can do this either by editing the\n CRD directly or by reaching out to its authors.\n\n4. Modify the CRD YAML definition, updating the\n `spec.conversion.webhook.clientConfig.caBundle` field with the valid\n CA bundle data. The result should look something like the following:\n\n spec:\n conversion:\n webhook:\n clientConfig:\n caBundle: \u003cbase64-encoded-ca-bundle\u003e\n\n5. Apply the corrected CRD:\n\n kubectl apply -f \u003ccorrected-crd-file.yaml\u003e\n\n6. Restore your custom resources:\n\n kubectl apply -f backup.yaml\n\nWhat's next\n-----------\n\n- [Optimize your usage of GKE with insights and\n recommendations](/kubernetes-engine/docs/how-to/optimize-with-recommenders)\n- [Troubleshooting common issues](/kubernetes-engine/docs/troubleshooting)"]]