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Docker & Kubernetes for Developers · Lesson

Introduction to GitOps with Kubernetes

Explore the principles of GitOps and how tools like Argo CD or Flux can manage your Kubernetes infrastructure and applications.

Introduction to GitOps with Kubernetes is a free Docker & Kubernetes for Developers lesson on CoddyKit — lesson 3 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Docker & Kubernetes for Developers learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.

GitOps: Code as Truth

GitOps is an operational framework that extends DevOps best practices to infrastructure and application automation. It uses Git as the single source of truth for your declarative infrastructure and applications.

Think of it as "operating infrastructure with Git requests." This approach ensures your system's actual state matches the desired state defined in your Git repository.

Declarative Configuration

A core principle of GitOps is declarative configuration. This means you describe what you want your infrastructure and applications to look like, rather than how to achieve it.

  • Your desired state is written in configuration files (like YAML for Kubernetes).
  • These files are stored in a Git repository.
  • Git becomes the single source of truth for your system's state.

Version Control & Rollbacks

Since Git is at the heart of GitOps, you get all its powerful benefits for free!

  • Version control: Every change to your infrastructure is tracked.
  • Collaboration: Teams can work together on infrastructure changes.
  • Auditing: A full history of changes is available.
  • Easy rollbacks: Revert to a previous working state by simply reverting a Git commit.

Automated Synchronization

How does your cluster know what's in Git? GitOps uses an automation agent (or operator) running inside your Kubernetes cluster.

This agent continuously monitors your Git repository for changes to the desired state. When it detects a difference, it automatically applies those changes to your cluster, ensuring synchronization.

Continuous Reconciliation

The automation agent doesn't just apply changes once. It performs continuous reconciliation.

  • It constantly compares the actual state of your cluster with the desired state defined in Git.
  • If any drift occurs (e.g., someone manually changes a resource, or a pod crashes), the agent detects it.
  • It then automatically corrects the cluster's state to match what's in Git, ensuring consistency and self-healing.

Why GitOps? Key Benefits

Adopting GitOps brings significant advantages to your development and operations workflows:

  • Increased Reliability: Consistent deployments, easy rollbacks.
  • Faster Deployments: Automated, repeatable processes.
  • Enhanced Security: Git provides an audit trail; changes are reviewed.
  • Improved Developer Experience: Use familiar Git workflows for operations.
  • Better Collaboration: All changes are visible and reviewable in Git.

GitOps vs. Push CI/CD

In traditional CI/CD, a pipeline often pushes changes to the cluster from an external system.

With GitOps, the cluster pulls changes from Git. This "pull request" model means the cluster agent initiates the deployment. It's often considered more secure as the cluster doesn't need external credentials to push changes.

GitOps Tools: Argo CD

Several open-source tools implement the GitOps pattern. Argo CD is a popular continuous delivery tool specifically designed for Kubernetes.

It works by continuously monitoring specified Git repositories and automatically synchronizing the desired state with the actual state of applications in a Kubernetes cluster, providing a powerful UI for visualization.

GitOps Tools: Flux CD

Another leading GitOps tool is Flux CD. Like Argo CD, Flux automates the deployment of applications to Kubernetes clusters directly from Git.

Flux ensures that the state of a cluster matches the configuration in a Git repository. It can also manage Helm releases and Kustomize overlays, offering flexibility in how you define your desired state.

Defining a K8s Deployment

Imagine this YAML file lives in your Git repository. An Argo CD or Flux agent would watch this file. When committed, the agent applies it to your cluster, creating or updating the deployment.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-webapp
  labels:
    app: my-webapp
spec:
  replicas: 2
  selector:
    matchLabels:
      app: my-webapp
  template:
    metadata:
      labels:
        app: my-webapp
    spec:
      containers:
      - name: webapp-container
        image: nginx:latest
        ports:
        - containerPort: 80

GitOps Core Ideas

Which of the following are core principles of GitOps?

GitOps Summary

You've explored GitOps, a powerful framework for managing infrastructure and applications using Git.

Remember, GitOps treats your Git repository as the single source of truth, uses declarative configurations, and relies on automated agents to continuously synchronize your cluster's state. Tools like Argo CD and Flux help implement this "pull" model for reliable and efficient deployments.

Frequently asked questions

Is the “Introduction to GitOps with Kubernetes” lesson free?

Yes — the full text of “Introduction to GitOps with Kubernetes” is free to read here on the web, and the Docker & Kubernetes for Developers course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Docker & Kubernetes for Developers course, upgrade to CoddyKit PRO.

What will I learn in “Introduction to GitOps with Kubernetes”?

Explore the principles of GitOps and how tools like Argo CD or Flux can manage your Kubernetes infrastructure and applications. You practise Docker & Kubernetes for Developers with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start Docker & Kubernetes for Developers?

No prior experience is required. Docker & Kubernetes for Developers on CoddyKit is structured for beginners through advanced learners; this is — lesson 3 of 4, so you can start here or from the beginning and move at your own pace.

How long does the “Introduction to GitOps with Kubernetes” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this Docker & Kubernetes for Developers lesson?

Yes. Every Docker & Kubernetes for Developers lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

All lessons in this course

  1. Integrating Docker into CI Pipelines
  2. Automated Deployments with Kubernetes CD
  3. Introduction to GitOps with Kubernetes
  4. Managing Kubernetes Manifests with Helm Charts
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