Continuous Delivery with Flux

1. Introduction

Continuous Delivery (CD) is a software development practice where code changes are automatically prepared for a release to production. Flux is a GitOps tool for Kubernetes that automates the delivery of applications, allowing for seamless integration and deployment.

2. Key Concepts

2.1 What is Flux?

Flux is a tool that synchronizes your Kubernetes cluster with your Git repository. It continuously monitors the repository for changes and applies them to the cluster.

2.2 What is GitOps?

GitOps is a set of practices that use Git pull requests to manage infrastructure and applications. It provides a way to manage Kubernetes resources declaratively using Git as the source of truth.

2.3 Flux Components

• Flux CLI: Command-line interface for interacting with Flux.
• Source Controller: Manages Git repositories and Helm charts.
• Kustomize Controller: Manages Kustomize overlays and configurations.

3. Setting Up Flux

To set up Flux, follow these steps:

1. Install the Flux CLI:

brew install flux

2. Bootstrap Flux in your Kubernetes cluster:

flux bootstrap github --owner=my-github-user --repository=my-repo --branch=main

3. Verify the installation:

flux check

4. Deploying Applications

To deploy an application using Flux:

1. Create a Git repository with your Kubernetes manifests.
2. Push your changes to the repository:

git add .
git commit -m "Add my app"
git push

3. Flux will detect the changes and apply them automatically to your cluster.

5. Best Practices

• Use meaningful commit messages.
• Structure your manifests for easy navigation.
• Regularly review and clean up your repository.

6. FAQ