Cloud-Native Microservices With Kubernetes - 2nd Edition

Argo CD: Managing Different Environments

You can manage different clusters using the same instance of Argo CD. For example, you can have a development environment, a staging environment, and a production environment. Each environment can be represented by a different Kubernetes cluster.

To add a cluster, use the following commands:

export cluster=
argocd cluster add $cluster -y

If we have a production cluster called production and a staging cluster called staging, we can add them to Argo CD using the following commands:

export cluster=production
argocd cluster add $cluster -y

export cluster=staging
argocd cluster add $cluster -y

In the Argo CD UI, you can see the different clusters in the Settings tab. Otherwise, list your clusters using:

argocd cluster list

Export the name of the cluster you want to use, depending on the environment to which you wish to deploy the application.

export CLUSTER=
# Example if you want to deploy to the default cluster
# export CLUSTER=kubernetes.default.svc

Then, deploy the application to that cluster using the following command:

kubectl apply -f - <
---
apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: flask-app
  namespace: argocd
spec:
  destination:
    namespace: flask-app
    # $CLUSTER is the name of the cluster
    # you want to deploy the application to
    server: $CLUSTER
  project: default
  source:
    repoURL: https://github.com/eon01/argocd-examples
    targetRevision: main
    path: flask-app-helm
    helm:
      valueFiles