Setup GitOps with ArgoCD

• GitOps is a set of practices for managing infrastructure and application configurations to expand upon existing processes and improve the application lifecycle.

• ArgoCD is a declarative, GitOps continuous delivery tool for Kubernetes. It does this by comparing the config repo to desired state.

Benefit

• Declarative GtOps Tool
• Kubernetes Native Continous Deployment
• Disaster Recovery
• Control Multiple Clusters

Prerequisites

• Kubernetes
• Configuration Repository

Here is the common pipeline that companies to use with ArgoCD

Setup ArgoCD

Create namespace and apply the argocd manifest installation file

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

Access ArgoCD GUI

kubectl port-forward service/argocd-server -n argocd 8080:443

then goto localhost:8080

username: admin

to get password, you need to go back to command line and type

kubectl -n argocd get secret argocd-initial-admin-secret -o jsonpath="{.data.password}" | base64 -d

now you will see the dashboard

Example

Now, I will show you how to use ArgoCD in a small helm chart project.
Usually, there are at least 2 repos for application and deployment.
In this example, I have a nodejs repo and a k8s repo.

in application repo

in k8s repo

Workflow

1.Add k8s repo to ArgoCD to monitor when it is changed to update the deployment

complete the detail of the app and repo

click create

2.When user commit or merge to main branch, the github action will build the new docker image and push it to dockerhub

3.After push successfully, the same pipeline will update the image tag number in k8s repo

4.ArgoCD detects the change in k8s repo and apply the new manifest from the repo

Code used in this article

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Leave a comment if you have any questions.

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