Describe Stacks

Describing stacks is helpful to understand what the final, fully computed and deep-merged configuration of a stack will look like. Use this to slice and dice the Stack configuration to show different information about stacks and component.

For example, if we wanted to understand what the final configuration looks like for the "production" stack, we could do that by calling the atmos describe stacks command to view the YAML output.

The output can be written to a file by passing the --file command-line flag to atmos or even formatted as YAML or JSON by using --format command-line flag.

Since the output of a Stack might be overwhelming, and we're only interested in some particular section of the configuration, the output can be filtered using flags to narrow the output by stack, component-types, components, and sections. The component sections can be further filtered by atmos_component, atmos_stack, atmos_stack_file, backend, backend_type, command, component, env, inheritance, metadata, overrides, remote_state_backend, remote_state_backend_type, settings, vars, workspace.

For example:

atmos describe stacks

plat-ue2-dev:
  components:
    terraform:
      vpc:
        backend: {}
        backend_type: s3
        command: terraform
        component: vpc
        env: {}
        inheritance: []
        metadata:
          component: vpc
        overrides: {}
        remote_state_backend: {}
        remote_state_backend_type: ""
        settings:
          validation:
            check-vpc-component-config-with-opa-policy:
              description: Check 'vpc' component configuration using OPA policy
              disabled: false
              module_paths:
                - catalog/constants
              schema_path: vpc/validate-vpc-component.rego
              schema_type: opa
              timeout: 10
            validate-vpc-component-with-jsonschema:
              description: Validate 'vpc' component variables using JSON Schema
              schema_path: vpc/validate-vpc-component.json
              schema_type: jsonschema
        vars:
          availability_zones:
            - us-east-2a
            - us-east-2b
            - us-east-2c
          enabled: true
          environment: ue2
          map_public_ip_on_launch: true
          max_subnet_count: 3
          name: common
          namespace: acme
          nat_gateway_enabled: true
          nat_instance_enabled: false
          region: us-east-2
          stage: dev
          tenant: plat
          vpc_flow_logs_enabled: true
          vpc_flow_logs_log_destination_type: s3
          vpc_flow_logs_traffic_type: ALL
        workspace: plat-ue2-dev
      vpc-flow-logs-bucket:
        backend: {}
        backend_type: s3
        command: terraform
        component: vpc-flow-logs-bucket
        env: {}
        inheritance: []
        metadata:
          component: vpc-flow-logs-bucket
        overrides: {}
        remote_state_backend: {}
        remote_state_backend_type: ""
        settings: {}
        vars:
          enabled: true
          environment: ue2
          force_destroy: true
          lifecycle_rule_enabled: false
          name: vpc-flow-logs
          namespace: acme
          region: us-east-2
          stage: dev
          tenant: plat
          traffic_type: ALL
        workspace: plat-ue2-dev

# Other stacks here

atmos describe stacks --components vpc --sections metadata --format json

{
  "plat-ue2-dev": {
    "components": {
      "terraform": {
        "vpc": {
          "metadata": {
            "component": "vpc"
          }
        }
      }
    }
  },
  "plat-ue2-prod": {
    "components": {
      "terraform": {
        "vpc": {
          "metadata": {
            "component": "vpc"
          }
        }
      }
    }
  },
  "plat-ue2-staging": {
    "components": {
      "terraform": {
        "vpc": {
          "metadata": {
            "component": "vpc"
          }
        }
      }
    }
  },
  "plat-uw2-dev": {
    "components": {
      "terraform": {
        "vpc": {
          "metadata": {
            "component": "vpc"
          }
        }
      }
    }
  },
  "plat-uw2-prod": {
    "components": {
      "terraform": {
        "vpc": {
          "metadata": {
            "component": "vpc"
          }
        }
      }
    }
  },
  "plat-uw2-staging": {
    "components": {
      "terraform": {
        "vpc": {
          "metadata": {
            "component": "vpc"
          }
        }
      }
    }
  }
}

PRO TIP

If the filtering options built-in to Atmos are not sufficient, redirect the output to jq for very powerful filtering options.