在Oracle RAC部署过程中要将服务器的公用IP地址，私有IP地址写入 /etc/hosts文件，并添加虚拟IP地址，集群唯一访问IP地址和公用IP地址，如下配置正确的星(所有子网掩码均为255.255.255.0):
（A）127.0.0.1 localhost 129.22.221.200 cluster-scan 129.22.221.201 node1 129.22.221.211 node1-priv 129.22.221.202 node2 129.22.221.212 node2-vip 192.168.222.212 node2-pric
（B）127.0.0.1 localhost 129.22.221.200 cluster-scan 129.22.221.201 node1 129.22.221.211 node1-priv 129.22.221.202 node2 129.22.221.212 node2-vip 192.168.221.212 node2-pric
（C）127.0.0.1 localhost 129.22.222.200 cluster-scan 129.22..221.201 node1 129.22.221.211 node1-priv 129.22.221.202 node2 129.22.221.212 node2-vip 192.168.221.212 node2-pric
（D）.127.0.0.1 localhost 129.22.221.200 cluster-scan 129.22.222.201 node1 129.22.221.211 node1-priv 129.22.221.202 node2 129.22.221.212 node2-vip 192.168.222.212 node2-pric
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