{"record":{"id":"9d173dfe468d9a03","repo":"kubernetes/kops","slug":"unexpected-error-during-validation-v","errorCode":null,"errorMessage":"unexpected error during validation: %v","messagePattern":"unexpected error during validation: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"cmd/kops/validate_cluster.go","lineNumber":201,"sourceCode":"\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"unexpected error creating validatior: %v\", err)\n\t}\n\n\tconsecutive := 0\n\tfor {\n\t\tif options.wait > 0 && time.Now().After(timeout) && consecutive == 0 {\n\t\t\treturn nil, fmt.Errorf(\"wait time exceeded during validation\")\n\t\t}\n\n\t\tresult, err := validator.Validate(ctx)\n\t\tif err != nil {\n\t\t\tconsecutive = 0\n\t\t\tif options.wait > 0 {\n\t\t\t\tklog.Warningf(\"(will retry): unexpected error during validation: %v\", err)\n\t\t\t\ttime.Sleep(options.interval)\n\t\t\t\tcontinue\n\t\t\t} else {\n\t\t\t\treturn nil, fmt.Errorf(\"unexpected error during validation: %v\", err)\n\t\t\t}\n\t\t}\n\n\t\tswitch options.output {\n\t\tcase OutputTable:\n\t\t\tif err := validateClusterOutputTable(result, cluster, instanceGroups, out); err != nil {\n\t\t\t\treturn nil, err\n\t\t\t}\n\t\tcase OutputYaml:\n\t\t\ty, err := yaml.Marshal(result)\n\t\t\tif err != nil {\n\t\t\t\treturn nil, fmt.Errorf(\"unable to marshal YAML: %v\", err)\n\t\t\t}\n\t\t\tif _, err := out.Write(y); err != nil {\n\t\t\t\treturn nil, fmt.Errorf(\"error writing to output: %v\", err)\n\t\t\t}\n\t\tcase OutputJSON:\n\t\t\tj, err := json.Marshal(result)","sourceCodeStart":183,"sourceCodeEnd":219,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/cmd/kops/validate_cluster.go#L183-L219","documentation":"When validator.Validate(ctx) returns an unexpected (non-validation-failure) error and --wait was NOT set (options.wait == 0), RunValidateCluster aborts immediately with this error. An 'unexpected' error means the validator itself failed — e.g. API client errors, context cancellation, discovery failures — as opposed to the cluster simply having failing nodes reported in result.Failures.","triggerScenarios":"`kops validate cluster` (no --wait) where a call inside validator.Validate fails: Kubernetes API request error, context deadline, pod/node list failure, or a panic-equivalent validator bug.","commonSituations":"API server temporarily unreachable (network blip, LB down); kubectl/admin creds revoked or expired; RBAC preventing the validator from listing pods; API version skew making discovery fail.","solutions":["Re-run with --wait and a duration so transient API errors are retried instead of fatal.","Check connectivity: `kubectl cluster-info` and `kubectl get nodes` with the same kubeconfig.","Re-export credentials: `kops export kubecfg <cluster>` in case certs expired.","Verify RBAC allows the validating client to read nodes and pods.","Inspect kops version vs cluster version skew; upgrade kops if the validation API changed."],"exampleFix":"// before\nkops validate cluster --name mycluster\n// after\nkops validate cluster --name mycluster --wait 5m --interval 10s","handlingStrategy":"retry","validationCode":"// pre-check API connectivity so a network blip doesn't produce an unexpected error\nif _, err := os.Stat(kubeconfigPath); err != nil {\n\treturn fmt.Errorf(\"kubeconfig missing: %w\", err)\n}\n_, err := clientset.Discovery().ServerVersion()\nif err != nil {\n\treturn fmt.Errorf(\"api unreachable, run with --wait to retry: %v\", err)\n}","typeGuard":null,"tryCatchPattern":"_, err := runValidate(ctx, opts)\nif err != nil && strings.Contains(err.Error(), \"unexpected error during validation\") {\n\t// retry with backoff; transient API errors are the usual cause\n\truntime.Gosched()\n\treturn retryWithBackoff(ctx, runValidate, opts)\n}","preventionTips":["Always pass --wait so transient validator errors are retried rather than fatal.","Refresh admin credentials with kops export kubecfg when certs age out.","Check RBAC allows listing nodes/pods for the validating identity.","Watch for context cancellation; don't kill the process mid-validation."],"tags":["kubernetes","validation","api-error"],"backgroundTag":"unexpected-validation-error","analyzedSha":"4c8573c808a73d578c5eadc86d410646ea0b0d73","analyzedAt":"2026-09-05T04:13:19.212Z","contentChangedAt":"2026-09-05T04:13:19.212Z","schemaVersion":2},"datasetVersion":"2026-09-12T07:17:12.445Z"}