{"record":{"id":"9cb86dd26426fa5a","repo":"kubernetes/kops","slug":"building-cert-manager-client-w","errorCode":null,"errorMessage":"building cert manager client: %w","messagePattern":"building cert manager client: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"channels/pkg/cmd/apply_channel.go","lineNumber":175,"sourceCode":"\nfunc RunApplyChannel(ctx context.Context, f *ChannelsFactory, out io.Writer, options *ApplyChannelOptions, args []string) error {\n\trestConfig, err := f.RESTConfig()\n\tif err != nil {\n\t\treturn err\n\t}\n\thttpClient, err := f.HTTPClient()\n\tif err != nil {\n\t\treturn err\n\t}\n\n\tk8sClient, err := f.KubernetesClient()\n\tif err != nil {\n\t\treturn fmt.Errorf(\"building kube client: %w\", err)\n\t}\n\n\tcmClient, err := certmanager.NewForConfigAndClient(restConfig, httpClient)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"building cert manager client: %w\", err)\n\t}\n\n\tdynamicClient, err := f.DynamicClient()\n\tif err != nil {\n\t\treturn fmt.Errorf(\"building dynamic client: %w\", err)\n\t}\n\n\trestMapper, err := f.RESTMapper()\n\tif err != nil {\n\t\treturn err\n\t}\n\n\tkubernetesVersionInfo, err := k8sClient.Discovery().ServerVersion()\n\tif err != nil {\n\t\treturn fmt.Errorf(\"error querying kubernetes version: %v\", err)\n\t}\n\n\tkubernetesVersion, err := semver.ParseTolerant(kubernetesVersionInfo.GitVersion)","sourceCodeStart":157,"sourceCodeEnd":193,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/channels/pkg/cmd/apply_channel.go#L157-L193","documentation":"RunApplyChannel builds a cert-manager typed client via certmanager.NewForConfigAndClient(restConfig, httpClient). If the REST config/transport cannot be turned into a cert-manager client (malformed host URL, bad TLS material), it fails with this message. This happens before any API call, so it is a client-construction problem, not a cluster response problem.","triggerScenarios":"RunApplyChannel invoked with a REST config whose Host is missing or malformed, or whose TLS settings are invalid such that the cert-manager codegen client's default http client setup rejects it.","commonSituations":"Cluster endpoint URL with unsupported scheme; corrupted kubeconfig host field; custom CA bundle file unreadable; version mismatch between the cert-manager client-go module and rest config.","solutions":["Verify the server URL in the kubeconfig/REST config is a well-formed https URL","Check CA certificate file paths in the config exist and are valid PEM","Rebuild the client with a freshly exported kubeconfig (kops export kubeconfig)","Read the wrapped inner error; it names the exact config field rejected"],"exampleFix":"// before\nserver: kubernetes.default.svc\n// after\nserver: https://kubernetes.default.svc","handlingStrategy":"try-catch","validationCode":"// Go: sanity-check host and CA before constructing clients\nu, err := url.Parse(restConfig.Host)\nif err != nil || u.Scheme != \"https\" {\n\treturn fmt.Errorf(\"precheck: invalid apiserver host %q\", restConfig.Host)\n}","typeGuard":null,"tryCatchPattern":"err := RunApplyChannel(ctx, f, out, options, args)\nif err != nil && strings.Contains(err.Error(), \"building cert manager client\") {\n\tklog.Errorf(\"cert-manager client init failed: %v\", err)\n\t// regenerate config / fix TLS material, then retry\n}","preventionTips":["Keep server URLs as full https:// URLs in kubeconfig","Validate CA bundles are valid PEM and readable","Regenerate client config after cluster endpoint changes","Keep cert-manager client-go module version aligned with the rest of the vendor tree"],"tags":["kubernetes","cert-manager","client-init","tls"],"backgroundTag":"kube-client-init-failed","analyzedSha":"4c8573c808a73d578c5eadc86d410646ea0b0d73","analyzedAt":"2026-09-05T04:13:19.212Z","contentChangedAt":"2026-09-05T04:13:19.212Z","schemaVersion":2},"datasetVersion":"2026-09-12T12:17:11.808Z"}