What are ArgoCD ApplicationSets?

Question

Accepted Answer

**ApplicationSets** — a mechanism for automatically creating Applications from a template.

**List Generator:**
```yaml
apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
metadata:
  name: myapp
  namespace: argocd
spec:
  generators:
    - list:
        elements:
          - env: dev
            cluster: https://dev-cluster
            revision: develop
          - env: staging
            cluster: https://staging-cluster
            revision: main
          - env: production
            cluster: https://prod-cluster
            revision: main
  template:
    metadata:
      name: "myapp-{{env}}"
    spec:
      source:
        repoURL: https://github.com/org/k8s-manifests
        targetRevision: "{{revision}}"
        path: "overlays/{{env}}"
      destination:
        server: "{{cluster}}"
        namespace: production
      syncPolicy:
        automated:
          prune: true
          selfHeal: true
```

**Git Generator:** Each folder in `apps/` creates a separate Application.

**Cluster Generator:** Automatically deploys to all registered clusters.

**Matrix Generator:** Combination of two generators (service × cluster).

DevOps: What are ArgoCD ApplicationSets?