Variable structure and best practice for this case of multi and multi type of instances creation

Terraform
1

Hi,

Appreciate any suggestions, recommendations, guidance on following scenario.
I have a requirement to create multiple ec2 instances and of different types with different configuration.
I have created a yaml file for this structure and produced a terraform output using locals to see the structure that terraform sees.
Now what is the variable structure for this scenario (tomcat-variables.tf) and whether it is a good practice to have such structure as future changes on any specific instance shouldn’t impact others?

tomcat (parent module)

  • providers.tf
  • tomcat.tf
  • tomcat-variables.tf
    • ec2 (child module)
      • main.tf
      • outputs.tf
      • variables.tf

Thanks,
Prabhu

yaml content:

tomcat_node_config:
node_type:
- support:
- inv_hostname:
- TOMCAT_SUPPORT_01
- TOMCAT_SUPPORT_02
- instance_type: r6i.xlarge
- app:
- inv_hostname:
- TOMCAT_APP_01
- TOMCAT_APP_02
- instance_type: r6i.large

Terraform outputs:

Changes to Outputs:

  • configop = {
    • tomcat_node_config = {
      • node_type = [
        • {
          • support = [
            • {
              • inv_hostname = [
                • “TOMCAT_SUPPORT_01”,
                • “TOMCAT_SUPPORT_02”,
                  ]
                  },
            • {
              • instance_type = “r6i.xlarge”
                },
                ]
                },
        • {
          • app = [
            • {
              • inv_hostname = [
                • “TOMCAT_APP_01”,
                • “TOMCAT_APP_02”,
                  ]
                  },
            • {
              • instance_type = “r6i.large”
                },
                ]
                },
                ]
                }
                }