diff --git a/Dockerfile b/Dockerfile
index 595f8ca..842dc79 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:17.04
+FROM ubuntu:17.10
 
 ENV GOPATH=/go PATH=/go/bin:/usr/lib/go-1.8/bin:$PATH
 
@@ -19,6 +19,7 @@ RUN apt-get update \
         dosfstools \
         kpartx \
         golang-1.8-go \
+        rsync \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/* \
     && go get \
diff --git a/pkg/pi64/metadata.go b/pkg/pi64/metadata.go
index a58fdbd..4117391 100644
--- a/pkg/pi64/metadata.go
+++ b/pkg/pi64/metadata.go
@@ -24,7 +24,7 @@ func ReadMetadata() (Metadata, error) {
 }
 
 func WriteMetadata(metadata Metadata) error {
-	file, err := os.OpenFile(metadataPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 644)
+	file, err := os.OpenFile(metadataPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
 	if err != nil {
 		return err
 	}