Friday 17th April was the day we came together to brainstorm at a high level what sort of standards we want for AWS in terms of networking, security, managed applications etc. This would then form the foundations of what would be knowledge to build infrastructure for the migration. It also served to share knowledge of what AWS would be like in comparison to Azure.
Networking
The first thing we’ve drawn out is what our standard structure of what a VPC (Virtual private cloud) will look like, we did this as a first step as a VPC is the container for all things.
Description:
When defining a VPC, would should define a network CIDR block as 172.0.x.x/16. 172 range was chosen as there would be no conflict with any existing HEE/NHS infra if we needed connect them. /16 would give us more than 64k IP addresses per VPC, more than plenty
Regions - there is a limit to these (5 VPC’s per region) but it can be increased. We are to target the EU-West2 London region to ensure any data is kept within the confines of the UK so that we keep within regulations
AZ (Availability Zones) These are locations within
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