{"record":{"id":"2ad4cccf770bc6cc","repo":"kubernetes/kops","slug":"error-building-configbase-for-cluster-v","errorCode":null,"errorMessage":"error building ConfigBase for cluster: %v","messagePattern":"error building ConfigBase for cluster: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"upup/pkg/fi/cloudup/new_cluster.go","lineNumber":261,"sourceCode":"\t\t\tcluster.Spec.KubernetesVersion = kubernetesVersion.String()\n\t\t}\n\t} else {\n\t\tcluster.Spec.KubernetesVersion = opt.KubernetesVersion\n\t}\n\n\t// Verify the kubernetes version early (while we can still handle the version nicely)\n\tif cluster.Spec.KubernetesVersion != \"\" {\n\t\tif _, err := util.ParseKubernetesVersion(cluster.Spec.KubernetesVersion); err != nil {\n\t\t\treturn nil, fmt.Errorf(\"cannot parse KubernetesVersion %q: %w\", cluster.Spec.KubernetesVersion, err)\n\t\t}\n\t}\n\n\tcluster.Spec.ConfigStore = api.ConfigStoreSpec{\n\t\tBase: opt.ConfigBase,\n\t}\n\tconfigBase, err := clientset.ConfigBaseFor(cluster)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"error building ConfigBase for cluster: %v\", err)\n\t}\n\tcluster.Spec.ConfigStore.Base = configBase.Path()\n\n\tcluster.Spec.Authorization = &api.AuthorizationSpec{}\n\tif strings.EqualFold(opt.Authorization, AuthorizationFlagAlwaysAllow) {\n\t\tcluster.Spec.Authorization.AlwaysAllow = &api.AlwaysAllowAuthorizationSpec{}\n\t} else if opt.Authorization == \"\" || strings.EqualFold(opt.Authorization, AuthorizationFlagRBAC) {\n\t\tcluster.Spec.Authorization.RBAC = &api.RBACAuthorizationSpec{}\n\t} else {\n\t\treturn nil, fmt.Errorf(\"unknown authorization mode %q\", opt.Authorization)\n\t}\n\n\tcluster.Spec.IAM = &api.IAMSpec{\n\t\tAllowContainerRegistry: true,\n\t}\n\tcluster.Spec.Kubelet = &api.KubeletConfigSpec{\n\t\tAnonymousAuth: new(false),\n\t}","sourceCodeStart":243,"sourceCodeEnd":279,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/upup/pkg/fi/cloudup/new_cluster.go#L243-L279","documentation":"After setting the config store, NewCluster calls clientset.ConfigBaseFor(cluster) to resolve the VFS path where the cluster's configuration will be stored. If that resolution fails (bad state store URL, unsupported scheme, backend errors), the error is wrapped as 'error building ConfigBase for cluster'.","triggerScenarios":"`kops create cluster` with an invalid --state value (e.g. unreachable S3 bucket, malformed vfs:// or gs:// path), or permissions preventing the backend from being accessed during path construction.","commonSituations":"Typo in --state s3://bucket name; bucket not existing yet or in another region/account; using a scheme the VFS layer does not recognize; expired cloud credentials.","solutions":["Fix the --state flag / opt.ConfigBase to a valid store path, e.g. --state s3://my-kops-state-bucket","Create the S3 bucket (or equivalent) and verify credentials with the cloud CLI","Read the wrapped %v error for the concrete backend failure"],"exampleFix":"// before\nkops create cluster --state s3://nonexistent-bucket --name c.example.com\n// after\nkops create cluster --state s3://my-existing-kops-bucket --name c.example.com","handlingStrategy":"try-catch","validationCode":"// Ensure --state is a well-formed, reachable store first:\n// e.g. verify s3://bucket exists and credentials work via the cloud CLI.","typeGuard":null,"tryCatchPattern":"result, err := NewCluster(opt, cs)\nif err != nil {\n    if strings.Contains(err.Error(), \"error building ConfigBase\") {\n        // inspect wrapped cause: fix --state path or credentials\n    }\n    return err\n}","preventionTips":["Create the state bucket before running create cluster","Verify cloud credentials (aws s3 ls s3://bucket)","Use standard s3:// or gs:// schemes recognized by kOps VFS"],"tags":["state-store","vfs","configuration"],"backgroundTag":"invalid-state-store","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"}