CentOS自带的VNC服务器，第一次连接时显示灰色背景以及一些很难看的GUI
解决方案：
Configuring Desktop Environment
The user specific configuration files of vncviewer resides in ‘.vnc’ directory in user’s home directory. (e.g. ‘/home/saini/.vnc/’). Open ‘/root/.vnc/xstartup’ in your favorite editor and edit as below
For Gnome
The ‘xstartup’ file shout look like this
#!/bin/sh
# Uncomment the following two lines for normal desktop:
unset SESSION_MANAGER
exec /etc/X11/xinit/xinitrc
[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
#xsetroot -solid grey
#vncconfig -iconic &
#xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
#twm &
startx &
使用vncpasswd命令设置vnc密码
service vncserver start
vncserver :4 -geometry 1300x700