Write up ECS Preparation Checklist for the java services

[terrywbrady]

Guidance on when to use SSM

• A setting is so volatile that you intended to dynamically reload the value while your service is running
• For credentials

Mechanism for passing SSM

• Under EC2, we resolved SSM values after parsing a yaml file
• Under ECS, we should explore container definition secrets (decided we will not pursue this)

Guidance on when to use values

• Value is very unlikely to change
• Value is appropriate to include in a public repository
• A code change is likely to occur when the value needs to change

Guidance on when to use ENV

• Under ECS, most config will be defined with ENV
• The ENV settings will be captured in the mrt-sceptre repo, so the values will be saved in a private location

Recommended yaml updates

• Share the same config for ecs-stg, ecs-prd and ideally ecs-dev
• Continue to have special config for docker compose and ecs-ephemeral

Special consideration - cloud node table

• Cloud note yaml table should be read from a config S3 repo rather than from the classpath

[terrywbrady]

@elopatin-uc3 closing this. This will happen as a part of the migration