kustomize-set-image

kustomize-set-image updates the kustomization.yaml file in a specified directory to reflect a different revision of a container image. It is equivalent to executing kustomize edit set image. This step is commonly followed by a kustomize-build step.

Configuration

Name	Type	Required	Description
path	string	Y	Path to a directory containing a kustomization.yaml file. This path is relative to the temporary workspace that Kargo provisions for use by the promotion process.
images	[]object	N	The details of changes to be applied to the kustomization.yaml file. When left unspecified, all images from the Freight collection will be set in the Kustomization file. Unless there is an ambiguous image name (for example, due to two Warehouses subscribing to the same repository), which requires manual configuration.
images[].image	string	Y	Name/URL of the image being updated.
images[].tag	string	N	A tag naming a specific revision of image. Mutually exclusive with digest. If none of these are specified, the tag specified by a piece of Freight referencing image will be used as the value of this field.
images[].digest	string	N	A digest naming a specific revision of image. Mutually exclusive with tag. If none of these are specified, the tag specified by a piece of Freight referencing image will be used as the value of tag.
images[].newName	string	N	A substitution for the name/URL of the image being updated. This is useful when different Stages have access to different container image repositories (assuming those different repositories contain equivalent images that are tagged identically). This may be a frequent consideration for users of Amazon's Elastic Container Registry.

Output

Name	Type	Description
commitMessage	string	A description of the change(s) applied by this step. Typically, a subsequent git-commit step will reference this output and aggregate this commit message fragment with other like it to build a comprehensive commit message that describes all changes.

Examples

Common Usage

In this example, a Kustomize overlay is updated to use a new container image tag. After cloning the repository and clearing the output directory, the kustomize-set-image step modifies the kustomization.yaml file to use the image tag from the Freight being promoted. The image reference is parameterized using variables to make the configuration more maintainable.

This pattern is commonly used when you want to update the version of a container image that will be deployed to a specific stage.

info

For more information on imageFrom and expressions, see the Expressions documentation.

vars:
- name: gitRepo
  value: https://github.com/example/repo.git
- name: imageRepo
  value: my/image
steps:
- uses: git-clone
  config:
    repoURL: ${{ vars.gitRepo }}
    checkout:
    - commit: ${{ commitFrom(vars.gitRepo).ID }}
      path: ./src
    - branch: stage/${{ ctx.stage }}
      create: true
      path: ./out
- uses: git-clear
  config:
    path: ./out
- uses: kustomize-set-image
  config:
    path: ./src/base
    images:
    - image: ${{ vars.imageRepo }}
      tag: ${{ imageFrom(vars.imageRepo).Tag }}
# Render manifests to ./out, commit, push, etc...

Changing an Image Name

For this example, consider the promotion of Freight containing a reference to some revision of the container image 123456789012.dkr.ecr.us-east-1.amazonaws.com/my-image. This image exists in the us-east-1 region of Amazon's Elastic Container Registry. However, assuming the Stage targeted by the promotion is backed by environments in the us-west-2 region, it will be necessary to make a substitution when updating the kustomization.yaml file. This can be accomplished like so:

vars:
- name: gitRepo
  value: https://github.com/example/repo.git
steps:
- uses: git-clone
  config:
    repoURL: ${{ vars.gitRepo }}
    checkout:
    - commit: ${{ commitFrom(vars.gitRepo).ID }}
      path: ./src
    - branch: stage/${{ ctx.stage }}
      create: true
      path: ./out
- uses: git-clear
  config:
    path: ./out
- uses: kustomize-set-image
  config:
    path: ./src/base
    images:
    - image: 123456789012.dkr.ecr.us-east-1.amazonaws.com/my-image
      newName: 123456789012.dkr.ecr.us-west-2.amazonaws.com/my-image
# Render manifests to ./out, commit, push, etc...