nova-vncproxy 是nova中一个单独的服务组件，需要一个noVNC来实现虚拟机vnc代理到websock，从而实现在浏览器使用vnc。
安装服务
nova-novncproxy
nova-consoleauth
相关配置项
controller节点
#novncproxy lisnten port novncproxy_port=6080 #bind ip 如果想让别人访问就要用公网IP novncproxy_host=0.0.0.0
compute节点
#start to use vnc vnc_enabled=true #location of vnc console proxy, in the form of http://127.0.0.1:6080 novncproxy_base_url=http://controller_ip:6080/vnc_auto.html #Ip address on which instance vncserversshould listen vncserver_listen=0.0.0.0
#如果要想使用虚拟机在线迁移，必须监听所有地址 #the address to which proxy clients should connect vncserver_proxyclient_address=compute_node_ip