{"record":{"id":"f05100d64b95eed4","repo":"kubernetes/kops","slug":"error-writing-secret-to-q-v","errorCode":null,"errorMessage":"error writing secret to %q: %v","messagePattern":"error writing secret to %q: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"upup/pkg/fi/secrets/clientset_secretstore.go","lineNumber":95,"sourceCode":"\n\t\tname := strings.TrimPrefix(keyset.Name, NamePrefix)\n\t\tp := BuildVfsSecretPath(basedir, name)\n\n\t\ts := &fi.Secret{\n\t\t\tData: primary.PrivateMaterial,\n\t\t}\n\t\tdata, err := json.Marshal(s)\n\t\tif err != nil {\n\t\t\treturn fmt.Errorf(\"error serializing secret: %v\", err)\n\t\t}\n\n\t\tacl, err := acls.GetACL(ctx, p, c.cluster)\n\t\tif err != nil {\n\t\t\treturn err\n\t\t}\n\n\t\tif err := p.WriteFile(ctx, bytes.NewReader(data), acl); err != nil {\n\t\t\treturn fmt.Errorf(\"error writing secret to %q: %v\", p, err)\n\t\t}\n\t}\n\n\treturn nil\n}\n\n// FindSecret implements fi.SecretStore::FindSecret\nfunc (c *ClientsetSecretStore) FindSecret(name string) (*fi.Secret, error) {\n\tctx := context.TODO()\n\n\ts, err := c.loadSecret(ctx, name)\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\treturn s, nil\n}\n\n// ListSecrets implements fi.SecretStore::ListSecrets","sourceCodeStart":77,"sourceCodeEnd":113,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/upup/pkg/fi/secrets/clientset_secretstore.go#L77-L113","documentation":"This error is returned by ClientsetSecretStore.MirrorTo when the vfs.Path.WriteFile call fails after the secret has been successfully serialized. It wraps the underlying storage-layer error (S3/GS/swift/file etc.), so the root cause is in the wrapped %v text. It means the secret bytes could not be persisted to the backing store at the given path.","triggerScenarios":"During MirrorTo, after GetACL succeeds, p.WriteFile(ctx, bytes.NewReader(data), acl) returns an error — network failure, missing bucket/container, insufficient IAM permissions, or ACL mismatch on the VFS path for the cluster.","commonSituations":"Cloud credentials missing or expired during `kops toolbox dump`/secret mirroring; S3 bucket deleted or wrong --state store configured; IAM policy lacking s3:PutObject; read-only state store; transient network outage.","solutions":["Read the wrapped error after %v to find the storage-layer root cause","Verify the state store path (--state) points to an existing, writable location","Check cloud IAM credentials/permissions allow writing to the secret path (e.g. s3:PutObject on the cluster prefix)","Confirm network connectivity/VPN to the storage endpoint and retry","Verify the ACL returned by acls.GetACL matches the backend's permission model"],"exampleFix":"// before: blind retry hides transient cause\nif err := p.WriteFile(ctx, bytes.NewReader(data), acl); err != nil {\n    return fmt.Errorf(\"error writing secret to %q: %v\", p, err)\n}\n// after: retry transient storage failures\nif err := p.WriteFile(ctx, bytes.NewReader(data), acl); err != nil {\n    return fmt.Errorf(\"error writing secret to %q: %v\", p, err)\n}\n// caller side:\nif err := store.MirrorTo(ctx, basedir); err != nil {\n    if isTransient(err) { time.Sleep(retryBackoff); err = store.MirrorTo(ctx, basedir) }\n    if err != nil { return err }\n}","handlingStrategy":"retry","validationCode":"// verify the VFS destination is writable before mirroring\nfunc writable(p vfs.Path) error {\n    acl, err := acls.GetACL(context.TODO(), p, cluster)\n    if err != nil { return err }\n    probe := BuildVfsSecretPath(p, \".write-probe\")\n    if err := probe.WriteFile(context.TODO(), bytes.NewReader([]byte{}), acl); err != nil {\n        return fmt.Errorf(\"state store not writable: %v\", err)\n    }\n    return probe.Remove(context.TODO())\n}","typeGuard":"func isVFSWriteError(err error) bool {\n    return err != nil && strings.Contains(err.Error(), \"error writing secret to\")\n}","tryCatchPattern":"err := store.MirrorTo(ctx, basedir)\nif err != nil && isVFSWriteError(err) {\n    for i := 0; i < 3; i++ {\n        time.Sleep(time.Duration(1<<i) * time.Second)\n        if err = store.MirrorTo(ctx, basedir); err == nil { break }\n    }\n}\nif err != nil { return err }","preventionTips":["Validate cloud credentials (aws sts get-caller-identity / gcloud auth) before running kops commands","Confirm --state store path exists and is writable by your IAM principal","Pre-create the state store bucket/prefix with correct ACLs (kops uses vfs ACLs per cluster)","Test with a small write probe to the same VFS path before bulk mirroring"],"tags":["vfs","storage","permissions","kops","secrets"],"backgroundTag":"storage-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"}