diff --git a/Dockerfile b/Dockerfile
index 95e386e..07840be 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,4 @@
-FROM ubuntu
-RUN apt-get update
-RUN apt-get -y install software-properties-common python-software-properties
-RUN apt-get -y install python
-RUN apt-get -y install python-pip
+FROM python:2.7
 ENV PYTHONUNBUFFERED 1
 ENV oj_env daocloud
 RUN mkdir /var/oj
@@ -11,4 +7,4 @@ WORKDIR /var/oj/
 RUN pip install -r requirements.txt
 EXPOSE 8080
 RUN mkdir LOG
-CMD python manage.py runserver 8080
+CMD bash -c "python manage.py runserver 8080"