4-reuse-app-in-prod

Re-use application base in prod

Since we spent some time making sure that we have a proper templated approach from the get-go, we can now pretty easily add the same application into a separate environment without having to copy/paste a bunch of Kubernetes manifests. The only thing we need to add is the Kustomization resource, and a new kustomize overlay for production.

Usually in production environments, you want to set a specific version of an app, set a different number of replicas, and such. We will add these changes to the Kustomize overlay.

Production overlay

We will follow the same type of pattern that we already have in our development environment, but this time we will add a specific version of the container tag as part of the overlay.

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
namespace: podtato-head
resources:
  - ../../base/podtato-head
commonLabels:
  env: prod
images:
  - name: ghcr.io/podtato-head/entry
    newTag: 0.2.7
  - name: ghcr.io/podtato-head/hat
    newTag: 0.2.7
  - name: ghcr.io/podtato-head/left-arm
    newTag: 0.2.7
  - name: ghcr.io/podtato-head/right-arm
    newTag: 0.2.7
  - name: ghcr.io/podtato-head/left-leg
    newTag: 0.2.7
  - name: ghcr.io/podtato-head/right-leg
    newTag: 0.2.7

We go through all the images defined in our deployments throughout the base manifests file, and update the tag to be a 0.2.7 instead of latest.