Additionally, the params that ufo sends to the ruby aws-sdk methods to create resources can be customized with a params.yml file. This allows you to customize the tool using the full power of the aws-sdk.

A starter project .ufo/params.yml file is generated as part of the ufo init command. Let’s take a look at an example params.yml:

# These params are passsed to the corresponding aws-sdk ecs client methods.
# AWS Docs example:
# The network helper provides access to the .ufo/settings/network/[PROFILE].yml
# More docs:

# ufo task calls run_tasks
  # network_configuration is required for FARGATE
      subnets: <%= network[:ecs_subnets].inspect %> # required
      security_groups: <%= network[:ecs_security_groups].inspect %>
      assign_public_ip: "ENABLED" # accepts ENABLED, DISABLED

Ufo provides 1st class citizen access to adjust the params sent to the aws-sdk calls:

The parameters from this params.yml file get merged with params ufo generates internally. Here’s an example of where the merging happens in the source code for the run task command task.rb. Also, here’s the starter params.yml source code for reference.

ERB and shared variables are available in the params file. You can also define the subnets in your config/variables and use them in them in the params.yml file.

NOTE: The params.yml file does not have access to the task_definition_name helper method. That is only available in the task_definitions.rb template_definition code blocks.

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