Overriding SSM parameter store KVPs locally

[rcdailey]

I'd like the ability to override SSM parameter store key-value pairs (KVPs) locally using either environment variables or appsettings.Development.json. My understanding, however, is that the SSM parameter store keys take precedence over local overrides, leaving me with no ability to override them for development and testing purposes.

I have two main questions:

• When using environment variables, how would I override an SSM parameter store value named /foo/bar/baseUrl? I am unsure of the syntax.
• How do I alter the order of precedence for configuration values? Ideally, I want environment variables and appsettings.json to override values from SSM Parameter Store.

[ashishdhingra]

@rcdailey Thanks for posting the question. If you refer AddSystemsManager, it adds SystemsManagerConfigurationSource so that parameters could be read from Systems Manager parameter store.

Kindly refer Configuration providers that specifies that the Configuration sources are read in the order that their configuration providers are specified and Default application configuration sources for highest to lowest priority of configuration providers. So the configuration provider which is added last has the highest priority.

Based on above assumption, once you call builder.AddSystemsManager(), you can add the JSON configuration provider followed by Environment Variable configuration provider. You can use this logic along with Conditional compilation for your development and testing purposes.

Thanks,
Ashish

[rcdailey]

Excellent answer. Thank you very much for the help. I had always used the built-in order and never considered specifying it myself. I'm glad the solution ended up being pretty simple.

[github-actions[bot]]

Hello! Reopening this discussion to make it searchable.