Book Image

Kubernetes and Docker - An Enterprise Guide

By : Scott Surovich, Marc Boorshtein
Book Image

Kubernetes and Docker - An Enterprise Guide

By: Scott Surovich, Marc Boorshtein

Overview of this book

Containerization has changed the DevOps game completely, with Docker and Kubernetes playing important roles in altering the flow of app creation and deployment. This book will help you acquire the knowledge and tools required to integrate Kubernetes clusters in an enterprise environment. The book begins by introducing you to Docker and Kubernetes fundamentals, including a review of basic Kubernetes objects. You’ll then get to grips with containerization and understand its core functionalities, including how to create ephemeral multinode clusters using kind. As you make progress, you’ll learn about cluster architecture, Kubernetes cluster deployment, and cluster management, and get started with application deployment. Moving on, you’ll find out how to integrate your container to a cloud platform and integrate tools including MetalLB, externalDNS, OpenID connect (OIDC), pod security policies (PSPs), Open Policy Agent (OPA), Falco, and Velero. Finally, you will discover how to deploy an entire platform to the cloud using continuous integration and continuous delivery (CI/CD). By the end of this Kubernetes book, you will have learned how to create development clusters for testing applications and Kubernetes components, and be able to secure and audit a cluster by implementing various open-source solutions including OpenUnison, OPA, Falco, Kibana, and Velero.
Table of Contents (20 chapters)
1
Section 1: Docker and Container Fundamentals
5
Section 2: Creating Kubernetes Development Clusters, Understanding objects, and Exposing Services
9
Section 3: Running Kubernetes in the Enterprise

Deploying ArgoCD

So far, we have a way to get into our cluster, a way to store code, and a system for building our code and generating images. The last component of our platform is our GitOps controller. This is the piece that lets us commit manifests to our Git repository and make changes to our cluster. ArgoCD is a collaboration between Intuit and Weaveworks. It provides a great UI and is driven by a combination of custom resources and Kubernetes-native ConfigMap and Secret objects. It has a CLI tool, and both the web and CLI tools are integrated with OpenID Connect, so it will be easy to add SSO with our OpenUnison. Let's deploy ArgoCD and use it to launch our hello-python web service:

  1. Deploy using the standard YAML from https://argoproj.github.io/argo-cd/getting_started/:
    $ kubectl create namespace argocd
    $ kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml
  2. Create the Ingress object for ArgoCD by editing chapter14...