Implementing Multi-Tier Application by Using ArgoCD

Brief Definition

ArgoCD is a tool that enables development teams to implement changes to applications in a Kubernetes cluster. This is done by utilizing a Git repository as the primary source to define and maintain the desired state of the application.

In this tutorial, we will discuss how to deploy a Multi-Tier application using ArgoCD.

Environment Setup

• Create a Kubernetes cluster. This step will utilize a Kubernetes cluster created using RKE (Rancher Kubernetes Engine). Please refer to the following article to prepare your Kubernetes cluster.
  • High Availability Kubernetes Using RKE in CloudRaya Part 1
  • High Availability Kubernetes Using RKE in CloudRaya Part 2
  • High Availability Kubernetes Using RKE in CloudRaya Part 3
• You can install kubectl to interacting with related cluster..
• Install ArgoCD by using or Manifest file.
  • kubectl create namespace argocd
  • kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml
  • Config ArgoCD to public expose using Ingress

  • Example:

    apiVersion: networking.k8s.io/v1
    kind: Ingress
    metadata:
        nginx.ingress.kubernetes.io/backend-protocol: HTTPS
        nginx.ingress.kubernetes.io/ssl-passthrough: 'true'
      name: argocd.ahmadcloud.my.id
      namespace: argocd
      resourceVersion: '6106299'
    spec:
      ingressClassName: nginx
      rules:
        - host: argocd.ahmadcloud.my.id
          http:
            paths:
              - backend:
                  service:
                    name: argocd-server
                    port:
                      number: 443
                path: /
                pathType: Prefix
      tls:
        - hosts:
            - argocd.ahmadcloud.my.id
          secretName: star.ahmadcloud.my.id
    

Application and Project Definition

• Create ArgoCD project for multi-tier application
  
• Specify the Git repository for each component (frontend, backend, and database)..

• Configure access to Git repositories within ArgoCD. If you are using a private repository that requires access, please perform this configuration through the web UI.

Application Manifest Creation

• Please obtain an example manifest file from the following repository: https://gitlab.com/ahmadnromiz/learn-argocd. In the manifest/overlay path, there are costumization files used for declarative custom workloads before deploying to the Kubernetes cluster.
• The example of the base manifest file



• The example of the overlay manifest file