So it's been quite a while since the initial “Moon on the stick” session and we’ve learnt quite a bit since then. It’s been decided that the migration to AWS would happen as soon as possible, with the intention of switching off Azure (In regards to TIS) and serving TIS from AWS. This has meant that a gradual move to AWS with the intention of redesigning parts of TIS won’t be possible as it will impact costs as we would be running in 2 environments concurrently. This subsequently means that an “As is” migration will happen, keeping things a static as possible with the intention of changing TIS via technical debt tickets
Where are we now?
The following is a diagram of what we have for TIS in both a hardware and software view.
The Devops team has done some preliminary Spikes/Investigations to gauge possible technical strategies. This has left us with a number of virtual machines (EC2 instances) and a large part of the TIS services already deployed in AWS.
Methodology/Strategy/Focus
We currently see 3 parts of this migration work. This consists of:
Data
We currently have MySQL holding the majority of the TIS data, as well as MongoDB holding data used for the ESR (new world) integration work.
Our intention is to get the data migrated into AWS “As Is” with MySQL vm’s (just like in Azure) as EC2 instances and have “DMS” streaming updates from Azure into AWS. These DB VM’s will have the same network addresses and credentials so the current deployed applications will not need to be updated in any way (or have any different environment variables) in order for them to serve data.
These new DB VM’s will then have another “DMS” instance streaming data into the AWS managed service databases. These databases will be the final destination of the data, where new systems such as Trainee UI and “Moon on a stick” TIS will be able to access data from
This data strategy will allow us to have all services running in parallel (both aws and azure), destroy the services in Azure and have AWS serve all traffic and keep data for trainee ui fresh
Developers and Services
Flexibility and Managed services
What can we deliver early and ensure value to the customer?
How do we ensure that the existing system continue to work?
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