This is an example showing how to use Argocd ApplicationSets to automatically create Git Pull Request preview environments for micro-services.
This example builds on the App of Apps pattern by making use of Argcocd ApplicationSets. I call this "Appset of Apps".
The goal is to automatically deploy a particular application and its dependencies in an isolated K8s namespace whenever a Pull Request is created in Github. Although you can use any other generation method listed here
This example uses 2 git repositories, the first is the source repository. It contains the ApplicationSet definition as well as a Helm chart containing templates of the child apps. For this complete example I am using a slightly modified version of the example "app of apps" helm chart from Argocd
Example-repo/
├── helm/
│ ├── templates/
│ │ ├── service-a.yaml
│ │ └── service-b.yaml
│ ├── Chart.yaml
│ └── values.yaml
└── ApplicationSet.yaml
The second repo contains the Helm chart for deploying your applications. Of course, this is Argocd and you can also use Kustomize or plain K8s manifests. For this example we will deploy the example guestbook applications from Argocd