{"record":{"id":"31a031c52bcc6454","repo":"kubernetes/kops","slug":"error-marshaling-yaml-v-31a031","errorCode":null,"errorMessage":"error marshaling yaml: %v","messagePattern":"error marshaling yaml: (.+?)","errorType":"error_code","errorClass":null,"httpStatus":null,"severity":"error","filePath":"cmd/kops/toolbox_dump.go","lineNumber":301,"sourceCode":"\t\t\t\tklog.Warningf(\"error dumping resources: %v\", err)\n\t\t\t}\n\n\t\t\tlogDumper, err := dump.NewPodLogDumper(kubeConfig, options.Dir)\n\t\t\tif err != nil {\n\t\t\t\treturn fmt.Errorf(\"error creating pod log dumper: %w\", err)\n\t\t\t}\n\t\t\tif err := logDumper.DumpLogs(ctx); err != nil {\n\t\t\t\tklog.Warningf(\"error dumping pod logs: %v\", err)\n\t\t\t}\n\t\t}\n\t}\n\n\tif cloudResources != nil {\n\t\tswitch options.Output {\n\t\tcase OutputYaml:\n\t\t\tb, err := kops.ToRawYaml(cloudResources)\n\t\t\tif err != nil {\n\t\t\t\treturn fmt.Errorf(\"error marshaling yaml: %v\", err)\n\t\t\t}\n\t\t\t_, err = out.Write(b)\n\t\t\tif err != nil {\n\t\t\t\treturn fmt.Errorf(\"error writing to stdout: %v\", err)\n\t\t\t}\n\t\t\treturn nil\n\n\t\tcase OutputJSON:\n\t\t\tb, err := json.MarshalIndent(cloudResources, \"\", \"  \")\n\t\t\tif err != nil {\n\t\t\t\treturn fmt.Errorf(\"error marshaling json: %v\", err)\n\t\t\t}\n\t\t\t_, err = out.Write(b)\n\t\t\tif err != nil {\n\t\t\t\treturn fmt.Errorf(\"error writing to stdout: %v\", err)\n\t\t\t}\n\t\t\treturn nil\n","sourceCodeStart":283,"sourceCodeEnd":319,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/cmd/kops/toolbox_dump.go#L283-L319","documentation":"When `kops toolbox dump` is run with -o yaml, the collected cloudResources are serialized with kops.ToRawYaml. This error indicates YAML marshaling of the in-memory dump structure failed, so no output was produced. It is rare and points to data that cannot be represented as the raw YAML map form.","triggerScenarios":"Running `kops toolbox dump -o yaml` when ToRawYaml cannot convert the cloudResources value (unsupported/odd types produced by the dump, e.g. values that fail YAML conversion).","commonSituations":"Dumping clusters with unusual resource payloads; internal type changes after kops upgrades; custom output piping where the structure contains non-serializable values.","solutions":["Retry with -o json to see if JSON marshaling works and isolate the issue","Update kops to the latest patch release","File an issue with the cluster/cloud provider details if it reproduces"],"exampleFix":"// before\nb, err := kops.ToRawYaml(cloudResources)\nif err != nil {\n\treturn fmt.Errorf(\"error marshaling yaml: %v\", err)\n}\n// after — fall back to JSON so the user still gets a dump\nb, err := kops.ToRawYaml(cloudResources)\nif err != nil {\n\tklog.Warningf(\"yaml marshal failed (%v); falling back to json\", err)\n\tb, err = json.MarshalIndent(cloudResources, \"\", \"  \")\n\tif err != nil {\n\t\treturn fmt.Errorf(\"error marshaling json: %v\", err)\n\t}\n}","handlingStrategy":"try-catch","validationCode":"// No pre-call validation possible; data-dependent failure.\n// Ensure cloudResources contains plain map/slice/scalar types before marshaling.","typeGuard":null,"tryCatchPattern":"b, err := kops.ToRawYaml(cloudResources)\nif err != nil {\n\tklog.Warningf(\"yaml marshal failed: %v\", err)\n\tif b, jerr := json.MarshalIndent(cloudResources, \"\", \"  \"); jerr == nil {\n\t\t_, _ = out.Write(b)\n\t\treturn nil\n\t}\n\treturn fmt.Errorf(\"error marshaling yaml: %v\", err)\n}","preventionTips":["Prefer -o json if you only need machine-readable output","Keep kops up to date","Report persistent marshal failures upstream with cluster details"],"tags":["cli","serialization","yaml","dump"],"backgroundTag":"yaml-marshal-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"}