group_vars by multiple criteria

[Brian N]

Hello. I have an interesting scenario that I have been pondering and would like some input from the community. I would like to apply group_vars to series of servers, that are defined by application roles and also defined by the environments production and pre-producution, So the filter order should be: role --> environment

I am using dynamic inventory, in specific, AWS. 

The following tags are used: 

• tag_environment_prod
• tag_environment_preprod
  
• tag_role_app1
• tag_role_app2

EC2 instances would be tagged the following way:

preprod-app1: tag_environment_preprod, tag_role_app1

preprod-app2: tag_environment_preprod, tag_role_app2

prod-app1 :tag_environment_prod, tag_role_app1

Etc....

Regardless of the role assigned to that server, it shares a common configuration file:

#app.conf

APP_KEY={{ app_key }}

APP_THING1={{ app_thing1 }}

APP_THING2={{ app_thing2 }}

My goal is to first filter groups based upon role, then based upon environment. Maybe something like:

/group_vars

    /app1_prod

    /app1_preprod

    /app2_prod

    /app2_preprod

Using a dynamic inventory, how can I accomplish this filter using more than one EC2 tag?

Thanks!

Brian