service vncserver start

[root@localhost home]# cd ..
[root@localhost /]# cd ..
[root@localhost /]# vi /etc/sysconfig/vncservers
[root@localhost /]# su dark
[dark@localhost /]$ vnc passwd
bash: vnc: 未找到命令...
[dark@localhost /]$ vncpasswd
Password:
Verify:
[dark@localhost /]$ exit
exit
[root@localhost /]# service vncserver start
Redirecting to /bin/systemctl start vncserver.service
Failed to issue method call: Unit vncserver.service failed to load: No such file or directory.
不明白为什么启动失败