Image Transformers

  • This allows us to modify an image that a specific deployment or container is going to use via Kustomise.

  • We have the following Web-depl.yaml file as an example: 
    apiVersion: apps/v1
kind: Deployment
metadata:
name: web-deployment
spec:
replicas: 1
selector:
  matchLabels:
    component: web
template:
  metadata:
    labels:
      component: web
  spec:
    containers:
      - name: web
        image: nginx
  • Then define the kustomization.yaml file: ``` images:
    • name: nginx newName: haproxy ```

  • The name part makes reference to the specific image we want to replace.

    • It looks through all Kubernetes configs and checks for containers that use nginx.

    • Then we replace the image with newName, which is haproxy.

  • The name under the kustomization.yaml file specifies the name of the image, not the container.

    • It looks specifically for nginx in the above case.
  • When set, this changes the yaml file to the following:
apiVersion: apps/v1
kind: Deployment
metadata:
  name: web-deployment
spec:
  replicas: 1
  selector:
    matchLabels:
      component: web
  template:
    metadata:
      labels:
        component: web
    spec:
      containers:
        - name: web
          image: haproxy
  • We can also change the tag of the image using the following in the kustomization.yaml file as well: ``` images:
    • name: nginx newTag: 2.4 ```
  • This would then change the yaml file to the following: 
    apiVersion: apps/v1
kind: Deployment
metadata:
name: web-deployment
spec:
replicas: 1
selector:
  matchLabels:
    component: web
template:
  metadata:
    labels:
      component: web
  spec:
    containers:
      - name: web
        image: nginx:2.4
  • You can also change the image and the tag as well by specifying the new image name and tag in the kustomzation.yaml file: ``` images:
    • name: haproxy newTag: 2.4

```

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