Argo CD 3 cheatsheet

Argo CD 3: Declarative setup

4 common Argo CD 3 tasks.

Define an Application in YAML

Keep applications in Git too. This one deploys a Helm chart folder with automated sync.

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: web
  namespace: argocd
spec:
  project: default
  source:
    repoURL: https://github.com/example/deploy-repo.git
    targetRevision: main
    path: charts/web
    helm:
      valueFiles: [values-prod.yaml]
  destination:
    server: https://kubernetes.default.svc
    namespace: web
  syncPolicy:
    automated:
      prune: true
      selfHeal: true
    syncOptions:
      - CreateNamespace=true

Generate applications from a list

An ApplicationSet creates one Application per element, for example per environment.

apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
metadata:
  name: web-envs
  namespace: argocd
spec:
  generators:
    - list:
        elements:
          - env: staging
          - env: production
  template:
    metadata:
      name: 'web-{{env}}'
    spec:
      project: default
      source:
        repoURL: https://github.com/example/deploy-repo.git
        targetRevision: main
        path: 'envs/{{env}}'
      destination:
        server: https://kubernetes.default.svc
        namespace: 'web-{{env}}'
      syncPolicy:
        automated: {}

Create it from the file

Apply the Application manifest to the argocd namespace.

kubectl apply -n argocd -f application.yaml

Create a project

Projects limit which repositories, clusters and namespaces applications may use.

argocd proj create team-a \
  --description "Team A" \
  --src https://github.com/example/deploy-repo.git \
  --dest https://kubernetes.default.svc,team-a