progress made; adding additional parameter

Dockerfile

@@ -9,7 +9,7 @@ FROM ubuntu
 # MAINTAINER name Chunteng Xiao
 
 RUN apt-get update
-RUN apt-get install nodejs nginx
+RUN apt-get install nodejs nginx -y
 RUN rm -v /etc/nginx/nginx.conf
 ADD nginx.conf /etc/nginx
 EXPOSE 80