GitOps-k8s-deployment

GitOps is a methodology for implementing continuous deployment (CD) and infrastructure as code (IaC) using Git repositories as the single source of truth for defining and managing infrastructure and application configurations.
This repository demonstrates how we can use ArgoCD to implement GitOps methodology in our workflow to automate the deployment of our application on the Kubernetes cluster.

Architecture diagram of workflow

Project status

• Under progress.
• Last updated on 16 April 2024

Installation steps

1. Installing Docker

# update package list and install docker 
sudo apt-get update
sudo apt-get install docker.io

# Start and enable Docker as a service
sudo systemctl start docker
sudo systemctl enable docker

# Verify docker installation
docker --version

2. Install Jenkins

# installing java
yes | sudo apt install openjdk-11-jdk-headless

# installing Jenkins
sudo wget -O /usr/share/keyrings/jenkins-keyring.asc \
  https://pkg.jenkins.io/debian-stable/jenkins.io-2023.key
echo deb [signed-by=/usr/share/keyrings/jenkins-keyring.asc] \
  https://pkg.jenkins.io/debian-stable binary/ | sudo tee \
  /etc/apt/sources.list.d/jenkins.list > /dev/null
yes | sudo apt-get install jenkins

3. Install Kubernetes.
   Follow these instructions according to your OS: kubernetes.io/releases/download/

Usage

1. The source code for the Python application is stored in the ./python-app dir. You can change the source code and push the changes to GitHub.
2. The Jenkinsfile will get triggered using webhooks to create a new docker image and push it to the docker hub registry.
3. This will then trigger a different Jenkins job that will change the Kubernetes manifest YAML file in the repository that ArgoCD monitors.
4. Finally ArgoCD picks up the new changes and deploys the latest version of our application on the Kubernetes cluster.