images

Images modify the name, tags and/or digest for images without creating patches.

One can change the image in the following ways (Refer the following example to know exactly how this is done):

• postgres:8 to my-registry/my-postgres:v1,
• nginx tag 1.7.9 to 1.8.0,
• image name my-demo-app to my-app,
• alpine’s tag 3.7 to a digest value

It is possible to set image tags for container images through the kustomization.yaml using the images field. When images are specified, Apply will override the images whose image name matches name with a new tag.

Example

File Input

# deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: the-deployment
spec:
  template:
    spec:
      containers:
      - name: mypostgresdb
        image: postgres:8
      - name: nginxapp
        image: nginx:1.7.9
      - name: myapp
        image: my-demo-app:latest
      - name: alpine-app
        image: alpine:3.7

# kustomization.yaml
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization

images:
- name: postgres
  newName: my-registry/my-postgres
  newTag: v1
- name: nginx
  newTag: 1.8.0
- name: my-demo-app
  newName: my-app
- name: alpine
  digest: sha256:24a0c4b4a4c0eb97a1aabb8e29f18e917d05abfe1b7a7c07857230879ce7d3d3

resources:
- deployment.yaml

Build Output

apiVersion: apps/v1
kind: Deployment
metadata:
  name: the-deployment
spec:
  template:
    spec:
      containers:
      - image: my-registry/my-postgres:v1
        name: mypostgresdb
      - image: nginx:1.8.0
        name: nginxapp
      - image: my-app:latest
        name: myapp
      - image: alpine@sha256:24a0c4b4a4c0eb97a1aabb8e29f18e917d05abfe1b7a7c07857230879ce7d3d3
        name: alpine-app

Setting a Name

The name for an image may be set by specifying newName and the name of the old container image.

# kustomization.yaml
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
images:
  - name: mycontainerregistry/myimage
    newName: differentregistry/myimage

Setting a Tag

The tag for an image may be set by specifying newTag and the name of the container image.

# kustomization.yaml
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
images:
  - name: mycontainerregistry/myimage
    newTag: v1

Setting a Digest

The digest for an image may be set by specifying digest and the name of the container image.

# kustomization.yaml
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
images:
  - name: alpine
    digest: sha256:24a0c4b4a4c0eb97a1aabb8e29f18e917d05abfe1b7a7c07857230879ce7d3d3

Setting a Tag from the latest commit SHA

A common CI/CD pattern is to tag container images with the git commit SHA of source code. e.g. if the image name is foo and an image was built for the source code at commit 1bb359ccce344ca5d263cd257958ea035c978fd3 then the container image would be foo:1bb359ccce344ca5d263cd257958ea035c978fd3.

A simple way to push an image that was just built without manually updating the image tags is to download the kustomize standalone tool and run kustomize edit set image command to update the tags for you.

Example: Set the latest git commit SHA as the image tag for foo images.

kustomize edit set image foo:$(git log -n 1 --pretty=format:"%H")
kubectl apply -f .

Setting a Tag from an Environment Variable

It is also possible to set a Tag from an environment variable using the same technique for setting from a commit SHA.

Example: Set the tag for the foo image to the value in the environment variable FOO_IMAGE_TAG.

kustomize edit set image foo:$FOO_IMAGE_TAG
kubectl apply -f .

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