diff --git a/Dockerfile b/Dockerfile
index 1e6f017..aea0b39 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
-FROM centos:latest
+FROM centos:6
 MAINTAINER xiaosong
 RUN yum update -y \
-&& yum -y install wget vim tigervnc-server epel-release firefox \
+&& yum -y install wget tigervnc-server epel-release firefox \
 && yum -y groupinstall xfce
 RUN wget http://fpdownload.macromedia.com/get/flashplayer/pdc/11.2.202.635/install_flash_player_11_linux.x86_64.tar.gz \
 && mkdir flash_player \
@@ -9,8 +9,6 @@ RUN wget http://fpdownload.macromedia.com/get/flashplayer/pdc/11.2.202.635/insta
 && mkdir -p ~/.mozilla/plugins/ \
 && cp flash_player/libflashplayer.so ~/.mozilla/plugins/ \
 && rm -rf flash_player install_flash_player_11_linux.x86_64.tar.gz /tmp/.X11-unix/*
-ADD ./conf/vncserver@:1.service /lib/systemd/system/vncserver@:1.service
 ADD ./conf/xstartup /root/.vnc/xstartup
-RUN echo "xiaosong" | /usr/bin/vncpasswd -f > /root/.vnc/passwd
-RUN systemctl enable vncserver@:1.service
 EXPOSE 5901
+ENTRYPOINT ["/usr/bin/vncserver", ":1", "-geometry 1280x720", "-depth 24"]