装好了VNC, 修改了相关配置，输入service vncserverstart，竟然启动失败，折腾好久没结果，最后输入vncserver，设置密码，生成了相关目录，问题解决，用service vncserverrestart可以顺利重启vnc，如下是整个过程。

[root@test log]# service vncserver start
Starting VNC server: 2:root [FAILED]
[root@test log]# vncserver
You will require a password to access your desktops.
Password:
Verify:
xauth:  creating new authority file /root/.Xauthority
New ‘test.test.com:1 (root)’ desktop is test.test.com:1
Creating default startup script /root/.vnc/xstartup
Starting applications specified in /root/.vnc/xstartup
Log file is /root/.vnc/test.test.com:1.log