Zookeeper单机配置：
方式一、

<dubbo:registry
address="zookeeper://10.20.153.10:2181"/>

方式二、

<dubbo:registry
protocol="zookeeper"
address="10.20.153.10:2181"/>

Zookeeper集群配置:

方式一、

<dubbo:registry address="zookeeper://10.20.153.10:2181?backup=10.20.153.11:2181,10.20.153.12:2181"/>

方式二、

<dubbo:registry 
protocol="zookeeper"
address="10.20.153.10:2181,10.20.153.11:2181,10.20.153.12/>

集群配置方式一，特别适用于dubbo-admin 和dubbo-monitor