Git Repositories Dockerfile and Application Walkthrough

In this lesson, we demonstrate how to implement a CI/CD pipeline using Argo CD. The focus of this guide is on leveraging GitOps methodologies to establish a continuous deployment pipeline with CloudNative delivery mechanisms.

The demonstration is organized into two primary segments:

Continuous Integration (CI)
Continuous Deployment (CD)

Since our primary goal is to explore continuous deployment, we assume that the CI process is handled by tools such as Jenkins. As a result, topics like unit testing, artifact building, and Docker image creation are not covered here.

Note

This lesson emphasizes setting up the Argo CD operator in your Kubernetes cluster. It illustrates how changes in the Kubernetes manifest Git repository are detected automatically by Argo CD, ensuring that the cluster's state matches the desired configuration.

The image illustrates a CI/CD pipeline integrating application code and Kubernetes manifests, using Git repositories, Docker, and ArgoCD for deployment and state management.

Git Repository Overview

The continuous deployment pipeline is driven by a dedicated Git repository containing all the necessary Kubernetes manifests and YAML configuration files. When you explore the repository, locate the nginx-deployment folder. Inside this folder, you will find a single file named deployment.yaml.

The image shows a GitHub repository page named "CDPipelineArgo" with files and recent commit details, including an "nginx-deployment" folder and a README.md file.

NGINX Deployment Configuration

The deployment.yaml file provides a minimalistic configuration for deploying an NGINX instance in the Kubernetes cluster. The file defines a Deployment object, specifying the creation of one replica of the NGINX instance. Below is the content of the deployment.yaml file:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
        - name: nginx
          image: nginx:latest
          ports:
            - containerPort: 80

Conclusion

This walkthrough has detailed the setup of a continuous deployment pipeline using Argo CD. By integrating Git repositories that contain Kubernetes manifests with Argo CD, you can automate the synchronization of the cluster’s state with the desired state defined in Git.

In the next lesson, we will delve deeper into Argo CD to explore its advanced features and configurations.

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