Multi Cluster Application Deployment using ArgoCD (Hub-spoke Model)

prerequisites

kubectl – A command line tool for working with Kubernetes clusters. For more information, see Installing or updating kubectl. https://docs.aws.amazon.com/eks/latest/userguide/install-kubectl.html

eksctl – A command line tool for working with EKS clusters that automates many individual tasks. For more information, see Installing or updating. https://docs.aws.amazon.com/eks/latest/userguide/eksctl.html

AWS CLI – A command line tool for working with AWS services, including Amazon EKS. For more information, see Installing, updating, and uninstalling the AWS CLI https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-install.html in the AWS Command Line Interface User Guide.

After installing the AWS CLI, I recommend that you also configure it. For more information, see Quick configuration with aws configure in the AWS Command Line Interface User Guide. https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-quickstart.html#cli-configure-quickstart-config

Argo CD CLI(Not the actual Argo CD Installation) - https://argo-cd.readthedocs.io/en/stable/cli_installation/#installation

EKS Setup

EKS Clusters Creation

eksctl create cluster --name hub-cluster --region us-west-1

eksctl create cluster --name spoke-cluster-1 --region us-west-1

eksctl create cluster --name spoke-cluster-2 --region us-west-1

Kubernetes context connectivity with EKS

kubectl config get-contexts

kubectl config use-context <context-name>

Install ArgoCD

kubectl create namespace argocd

kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml

Run Argo CD in HTTP Mode(Insecure)

https://github.com/argoproj/argo-cd/blob/54f1572d46d8d611018f4854cf2f24a24a3ac088/docs/operator-manual/argocd-cmd-params-cm.yaml#L82

Expose Argo CD Server Service in NodePort Mode

kubectl edit svc argocd-server -n argocd

and change the type to NodePort from ClusterIP

kubectl get svc argocd-server -n argocd

Login to ArgoCD

Hit the Hub-cluster nodeport IP (two Ec2 instance is running, we can use public IP of any of our choice) with specified port in previous command output.

username is admin, to get password. Run:

kubectl get secret -n argocd

kubectl edit secret argocd-initial-admin-secret -n argocd

Copy the secret & decode it's base64 format:

echo [unique-encrypted-token] | base64 --decode

except for % sign, use it as your pass.

Login to argocd-cli

argocd login 13.233.140.21:32002

Add Spoke cluster 1 & spoke cluster 2 in Hub Cluster (or ArgoCD server Cluster)

argocd cluster add devops-project@spoke-cluster-1.ap-south-1.eksctl.io --server 13.233.140.21:32002

argocd cluster add devops-project@spoke-cluster-2.ap-south-1.eksctl.io --server 13.233.140.21:32002

Add ArgoCD Applications & test with manual changes

EKS Clusters Deletion

eksctl delete cluster --name hub-cluster --region us-west-1

eksctl delete cluster --name spoke-cluster-1 --region us-west-1

eksctl delete cluster --name spoke-cluster-2 --region us-west-1