Settings Cfn

Customizing Resources

The properties in the file .ufo/settings/cfn/default.yml map directly to ufo’s CloudFormation resources. It allows you to customize the resources. The keys get transform to CamelCase keys to work with the CloudFormation template.

Example of Customization

Let’s customize the AWS::ElasticLoadBalancingV2::TargetGroup resource created by CloudFormation. We’ll adjust the deregistration_delay.timeout_seconds to 8. Here’s the relevant section of the .ufo/settings/cfn/default.yml

TargetGroup:
...
  TargetGroupAttributes:
  - Key: deregistration_delay.timeout_seconds
    Value: 8

The value will be injected to the generated CloudFormation template under the corresponding “TargetGroup Properties”. The generated template looks something like this:

TargetGroup:
  Properties:
...
    TargetGroupAttributes:
    - Key: deregistration_delay.timeout_seconds
      Value: 8
...

In this way, you can customize and override any properties associated with resources created by the ufo CloudFormation stack.

Here’s a list of the resources in the cfn/stack.yml that you can customize:

• Ecs
• EcsSecurityGroup
• EcsSecurityGroupRule
• Elb
• ElbSecurityGroup
• Listener
• TargetGroup

Layering Support

The base.yml profile files always get evaluated and env-specific ENV.yml file are layered or merged together. This miminizes duplication. For example, these files are merged:

• .ufo/settings/cfn/base.yml
• .ufo/settings/cfn/development.yml

The settings in development.yml override the settings in base.yml. Here’s another example:

• .ufo/settings/network/base.yml
• .ufo/settings/network/development.yml

Note, this feature is available in v5.0.5+.

For the most up to date list check out the cfn/stack.yml source code directly.

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