{"record":{"id":"9504dd7eaccf596a","repo":"kubernetes/kops","slug":"error-writing-configuration-file-s-v","errorCode":null,"errorMessage":"error writing configuration file %s: %v","messagePattern":"error writing configuration file (.+?): (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"pkg/client/simple/vfsclientset/commonvfs.go","lineNumber":174,"sourceCode":"\t}\n\n\tacl, err := acls.GetACL(ctx, configPath, cluster)\n\tif err != nil {\n\t\treturn err\n\t}\n\n\trs := bytes.NewReader(data)\n\tif create {\n\t\terr = configPath.CreateFile(ctx, rs, acl)\n\t} else {\n\t\terr = configPath.WriteFile(ctx, rs, acl)\n\t}\n\tif err != nil {\n\t\tif create && os.IsExist(err) {\n\t\t\tklog.Warningf(\"failed to create file as already exists: %v\", configPath)\n\t\t\treturn err\n\t\t}\n\t\treturn fmt.Errorf(\"error writing configuration file %s: %v\", configPath, err)\n\t}\n\treturn nil\n}\n\nfunc (c *VFSClientBase) update(ctx context.Context, cluster *kops.Cluster, i runtime.Object) error {\n\tobjectMeta, err := meta.Accessor(i)\n\tif err != nil {\n\t\treturn err\n\t}\n\n\tif c.validate != nil {\n\t\terr = c.validate(i)\n\t\tif err != nil {\n\t\t\treturn err\n\t\t}\n\t}\n\n\tcreationTimestamp := objectMeta.GetCreationTimestamp()","sourceCodeStart":156,"sourceCodeEnd":192,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/pkg/client/simple/vfsclientset/commonvfs.go#L156-L192","documentation":"writeConfig calls configPath.WriteFile to persist the configuration object to the VFS state store. Any write error that is not the handled 'create but already exists' case is wrapped with this message. It indicates the state-store rejected the write.","triggerScenarios":"Create or Update calls writeConfig and vfs WriteFile fails: backend unavailable, permission denied, conditional-write conflict (create=true and file already exists), quota or network failure.","commonSituations":"Two clients concurrently creating the same cluster config (conditional-write conflict), IAM lacking s3:PutObject, backend outage, KMS/encryption misconfiguration on the bucket.","solutions":["Read the wrapped %v error to identify the backend cause and fix permissions/connectivity.","If 'create as already exists' is intended, handle the returned sentinel error rather than treating it as a storage fault.","Ensure the VFS backend allows conditional writes for create operations.","Retry once concurrent writers are eliminated."],"exampleFix":"// before\nIAM policy with only s3:GetObject\n// after\n{\"Effect\":\"Allow\",\"Action\":[\"s3:PutObject\"],\"Resource\":\"arn:aws:s3:::my-state-bucket/*\"}","handlingStrategy":"retry","validationCode":"if _, err := store.ReadFile(ctx, dir); err != nil {\n    return fmt.Errorf(\"cannot access state store before write: %w\", err)\n}\nif err := checkIAMWritePermission(ctx, bucket); err != nil {\n    return err\n}","typeGuard":null,"tryCatchPattern":"if err := client.Create(ctx, obj); err != nil {\n    if os.IsExist(err) {\n        // already exists: load and update instead\n        return client.Update(ctx, obj)\n    }\n    if isTransient(err) {\n        return retryWithBackoff(func() error { return client.Create(ctx, obj) })\n    }\n    return err\n}","preventionTips":["Ensure IAM credentials allow PutObject on the state bucket","Avoid concurrent writers to the same cluster state","Enable bucket versioning to recover from bad writes"],"tags":["vfs","state-store","write-failure"],"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"}