{"record":{"id":"a420801deaebbda6","repo":"kubernetes/kops","slug":"error-writing-cluster-q-v","errorCode":null,"errorMessage":"error writing Cluster %q: %v","messagePattern":"error writing Cluster %q: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"pkg/client/simple/vfsclientset/cluster.go","lineNumber":119,"sourceCode":"\n\tif errs := validation.ValidateCluster(c, false, r.vfsContext); len(errs) != 0 {\n\t\treturn nil, errs.ToAggregate()\n\t}\n\n\tif c.ObjectMeta.CreationTimestamp.IsZero() {\n\t\tc.ObjectMeta.CreationTimestamp = metav1.NewTime(time.Now().UTC())\n\t}\n\n\tclusterName := c.ObjectMeta.Name\n\tif clusterName == \"\" {\n\t\treturn nil, fmt.Errorf(\"clusterName is required\")\n\t}\n\n\tif err := r.writeConfig(ctx, c, r.basePath.Join(clusterName, registry.PathCluster), c, vfs.WriteOptionCreate); err != nil {\n\t\tif os.IsExist(err) {\n\t\t\treturn nil, err\n\t\t}\n\t\treturn nil, fmt.Errorf(\"error writing Cluster %q: %v\", c.ObjectMeta.Name, err)\n\t}\n\n\treturn c, nil\n}\n\nfunc (r *ClusterVFS) Update(c *api.Cluster, status *api.ClusterStatus) (*api.Cluster, error) {\n\tctx := context.TODO()\n\n\tclusterName := c.ObjectMeta.Name\n\tif clusterName == \"\" {\n\t\treturn nil, field.Required(field.NewPath(\"objectMeta\", \"name\"), \"clusterName is required\")\n\t}\n\n\told, err := r.Get(ctx, clusterName, metav1.GetOptions{})\n\tif err != nil {\n\t\treturn nil, err\n\t}\n","sourceCodeStart":101,"sourceCodeEnd":137,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/pkg/client/simple/vfsclientset/cluster.go#L101-L137","documentation":"ClusterVFS::Create failed to write the cluster config to the VFS state store. The returned error wraps the underlying vfs error, so the write itself (permissions, backend availability, unexpected existing file) failed after the Create option (WriteOptionCreate) was applied.","triggerScenarios":"Calling Create when the VFS backend is unwritable (bad credentials for s3/gcs, missing bucket, read-only filesystem) or a file already exists at basePath/<name>/pki/cluster and os.IsExist handling propagated it.","commonSituations":"Cloud storage credentials expired or not configured (e.g. AWS_PROFILE, GOOGLE_APPLICATION_CREDENTIALS); state store bucket deleted or permissions changed; attempting to create a cluster that already exists in the state store.","solutions":["Read the wrapped %v cause to identify the underlying vfs/backend error","Verify state store credentials and bucket access (e.g. aws s3 ls s3://<bucket>/clusters)","Check whether the cluster already exists — Create uses WriteOptionCreate and will not overwrite","Re-run kops create with correct --state or fix the VFS path"],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":"// pre-check backend access\n_, err := r.basePath.Join(\"pki\").ReadTree(ctx)\nif err != nil {\n\treturn fmt.Errorf(\"state store not writable/accessible: %w\", err)\n}","typeGuard":null,"tryCatchPattern":"created, err := clusterVFS.Create(ctx, cluster)\nif err != nil && strings.Contains(err.Error(), \"error writing Cluster\") {\n\tif os.IsExist(err) {\n\t\t// cluster already exists — surface as conflict\n\t\treturn ErrClusterExists\n\t}\n\t// otherwise check credentials/bucket, then retry\n\treturn fmt.Errorf(\"state store write failed, check credentials/bucket: %w\", err)\n}","preventionTips":["Verify cloud credentials (AWS/GCS/DO etc.) before writing to the state store","Check the bucket exists and is writable before kops create","Treat os.IsExist as a conflict, not a generic failure","Use a single kops version to avoid format mismatches"],"tags":["go","vfs","storage","io"],"backgroundTag":"state-store-write-failed","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"}