The AWS cloud opens a whole new level of frustration for data scientists. You now have access to a cornucopia of amazing tools, but one big bad ugly stands in the way: The Network!
I find the most frustrating part of a data project is configuring the network. In this post, I am going to review some basic VPC principles.
VPC CIDR blocks are blocks of IP addresses that you can allocate. Most examples show allocated the 10.192.0.0/16 CIDR block or the range that represents 256*256=65536 addresses. Likely far more IP addresses than you will ever need.
Better to use the 10.192.0.0/24 block which allocates 256 IP addresses and divide that up into blocks of 128 addresses using the /25 notation. Note that in AWS a 128 block range will give you 117 usable IP addresses.
VpcCIDR:
Description: The IP range (CIDR notation) for this VPC
Type: String
Default: 10.192.10.0/24
PrivateSubnet1CIDR:
Description: The IP range (CIDR notation) for the private subnet in the first Availability Zone
Type: String
Default: 10.192.10.0/25
PrivateSubnet2CIDR:
Description: The IP range (CIDR notation) for the private subnet in the second Availability Zone
Type: String
Default: 10.192.10.128/25