Create a YAML component document for custom components in Image Builder

To build a component, you must provide a YAML or JSON application component document. The document contains the code that runs during the phases and steps that you define to provide customization for your image.

Some of the examples in this section create a build component that calls the UpdateOS action module in the AWSTOE component management application. The module updates the operating system. For more information about the UpdateOS action module, see UpdateOS.

The macOS operating system example uses the ExecuteBash action module to install and verify the wget utility. The UpdateOS action module doesn't support macOS. For more information about the ExecuteBash action module, see ExecuteBash. For more information about the phases, steps, and syntax for AWSTOE application component documents, see Use documents in AWSTOE.

Note

Image Builder determines the component type from the phases that are defined in the component document as follows:

• Build – This is the default component type. Anything that is not classified as a test component, is a build component. This type of component runs during the image Build stage. If this build component has a test phase defined, that phase runs during the Test stage.

• Test – To qualify as a test component, the component document must include only one phase, named test. For tests that are related to build component configurations, we recommend that you don't use a standalone test component. Rather, use the test phase in the associated build component.

For more information about how Image Builder uses stages and phases to manage component workflow in its build process, see Use components to customize your Image Builder image.

To create a YAML application component document for a sample application, follow the steps on the tab that matches your image operating system.

Linux

Create a YAML component file

Use a file editing tool to create your component document. Documentation examples use a file named update-linux-os.yaml, with the following content:

# Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: MIT-0
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of this
# software and associated documentation files (the "Software"), to deal in the Software
# without restriction, including without limitation the rights to use, copy, modify,
# merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
# PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
name: update-linux-os
description: Updates Linux with the latest security updates.
schemaVersion: 1
phases:
  - name: build
    steps:
    - name: UpdateOS
      action: UpdateOS
# Document End

Tip

Use a tool like this online YAML Validator, or a YAML lint extension in your code environment to verify that your YAML is well-formed.

Windows

Create a YAML component file

Use a file editing tool to create your component document. Documentation examples use a file named update-windows-os.yaml, with the following content:

# Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: MIT-0
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of this
# software and associated documentation files (the "Software"), to deal in the Software
# without restriction, including without limitation the rights to use, copy, modify,
# merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
# PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
name: update-windows-os
description: Updates Windows with the latest security updates.
schemaVersion: 1.0
phases:
  - name: build
    steps:
      - name: UpdateOS
        action: UpdateOS
# Document End

Tip

Use a tool like this online YAML Validator, or a YAML lint extension in your code environment to verify that your YAML is well-formed.

macOS

Create a YAML component file

Use a file editing tool to create your component document. Documentation examples use a file named wget-macos.yaml, with the following content:

name: WgetInstallDocument
description: This is wget installation document.
schemaVersion: 1.0

phases:
  - name: build
    steps:
      - name: WgetBuildStep
        action: ExecuteBash
        inputs:
          commands:
            - |
              PATH=/usr/local/bin:$PATH
              sudo -u ec2-user brew install wget


  - name: validate
    steps:
      - name: WgetValidateStep
        action: ExecuteBash
        inputs:
          commands:
            - |
              function error_exit {
                echo $1
                echo "{\"failureMessage\":\"$2\"}"
                exit 1
              }

              type wget
              if [ $? -ne 0 ]; then
                error_exit "$stderr" "Wget installation failed!"
              fi

  - name: test
    steps:
      - name: WgetTestStep
        action: ExecuteBash
        inputs:
          commands:
            - wget -h

Tip

Use a tool like this online YAML Validator, or a YAML lint extension in your code environment to verify that your YAML is well-formed.