diff --git a/docker/Dockerfile b/docker/Dockerfile
index aa9c021..70457f0 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -2,7 +2,7 @@ FROM ubuntu:latest
 
 MAINTAINER Sah Lee <contact@leesah.name>
 
-ENV BASEDIR /
+ENV BASEDIR /tmp
 
 # Install dependencies
 RUN apt-get update
@@ -25,12 +25,13 @@ RUN apt-get --purge autoremove -y git-core python-setuptools
 RUN rm -rf $BASEDIR/shadowsocks
 
 # Config file can be in a separated container
-ENV CONF /etc/shadowsocks.json
-VOLUME ["$CONF"]
+ENV CONFIG_DIR /etc/shadowsocks
+ENV CONFIG_FILE $CONFIG_DIR/shadowsocks.json
+VOLUME ["$CONFIG_DIR"]
 
 # Port in the config file won't take affect. Instead we'll use 8388.
 ENV PORT 8388
 EXPOSE $PORT
 
 # Override the host and port in the config file.
-CMD ssserver --fast-open -c $CONF -s 0.0.0.0 -p $PORT
+CMD ssserver --fast-open -c $CONFIG_FILE -s 0.0.0.0 -p $PORT