You need to specify the number of nodes you want to use and the subnet they will use.
我们需要指定集群中想要使用的节点的个数，以及它们所使用的子网。
The subnet mask is an octet that USES the number 255 to represent the network address portion of the IP address and a zero to identify the host portion of the address.
子网掩码由四个字节组成，它的值为255时表示IP地址中网络地址的部分，值为0时则识别IP地址中表示主机号的部分。
Subnet mask is mainly used to define the network number, host number of IP address and divide one heavy IP network into several subnets.
子网掩码主要用于确定IP地址中的网络号和主机号以及将一个大的IP网络划分为若干个小的子网络。
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