Gitops with ArgoCI/CD

The Architecture diagram for GitOps workflow involving Continuous Integration (CI) and Continuous Deployment (CD) pipelines for Kubernetes. Here's a breakdown of each component and how they interact:

1. Source Code Repo:

• Git: The source code repository is where the application’s source code is stored and version-controlled using Git. Developers commit changes to this repository.

2. CI Pipeline:

• Jenkins/GitHub Actions: The CI pipeline automates the process of building, testing, and packaging the application. Jenkins or GitHub Actions are often used to trigger the CI process whenever there is a change in the source code repository.
• Docker Registry/Hub: Once the application is built, the CI pipeline creates a Docker image and pushes it to a Docker registry like Docker Hub. This image is what will eventually be deployed to the Kubernetes cluster.

3. Deployment Repo (GitOps Repo):

• Git: This repository contains deployment manifests, which describe how the application should be deployed and configured in the Kubernetes cluster. These manifests are typically written in YAML and might include Kubernetes resources like Deployments, Services, ConfigMaps, etc.
• Helm/Kustomize: Tools like Helm or Kustomize can be used to manage these manifests, providing templating and other advanced configuration management capabilities.
• Update Deployment Config: Changes to the source code may require updates to the deployment configuration. These updates are committed to the deployment repository.

4. CD Pipeline:

• Argo: Argo CD is a tool that automates the deployment of applications in a Kubernetes environment using the GitOps approach. It continuously monitors the deployment repository (GitOps repo) for any changes and automatically synchronizes the Kubernetes cluster state to match the desired state defined in the repo.
• Pull Changes: Argo pulls changes from the deployment repository to update the cluster’s configuration.
• Sync Cluster Status: Argo ensures that the Kubernetes cluster is always in sync with the desired state as defined in the GitOps repo.

5. Kubernetes Cluster:

• The Kubernetes cluster is where the application is deployed. The cluster pulls Docker images from the Docker registry and deploys them based on the manifests defined in the deployment repository.

Workflow Summary:

1. Development: Developers push changes to the source code repository.
2. CI: The CI pipeline builds and tests the application, then creates a Docker image and pushes it to a Docker registry.
3. GitOps: Deployment manifests are stored in a separate Git repository, which is continuously monitored by Argo CD.
4. CD: Argo CD pulls any changes from the deployment repository and applies them to the Kubernetes cluster, ensuring the cluster’s state matches the desired state defined in the GitOps repo.

This setup ensures that the entire deployment process is automated, reliable, and version-controlled, adhering to the GitOps principles where the Git repository is the single source of truth for both the application code and its deployment configuration.

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