Book Image

Modern DevOps Practices

By : Gaurav Agarwal
Book Image

Modern DevOps Practices

By: Gaurav Agarwal

Overview of this book

Containers have entirely changed how developers and end-users see applications as a whole. With this book, you'll learn all about containers, their architecture and benefits, and how to implement them within your development lifecycle. You'll discover how you can transition from the traditional world of virtual machines and adopt modern ways of using DevOps to ship a package of software continuously. Starting with a quick refresher on the core concepts of containers, you'll move on to study the architectural concepts to implement modern ways of application development. You'll cover topics around Docker, Kubernetes, Ansible, Terraform, Packer, and other similar tools that will help you to build a base. As you advance, the book covers the core elements of cloud integration (AWS ECS, GKE, and other CaaS services), continuous integration, and continuous delivery (GitHub actions, Jenkins, and Spinnaker) to help you understand the essence of container management and delivery. The later sections of the book will take you through container pipeline security and GitOps (Flux CD and Terraform). By the end of this DevOps book, you'll have learned best practices for automating your development lifecycle and making the most of containers, infrastructure automation, and CaaS, and be ready to develop applications using modern tools and techniques.
Table of Contents (19 chapters)
1
Section 1: Container Fundamentals and Best Practices
7
Section 2: Delivering Containers
15
Section 3: Modern DevOps with GitOps

Release gating with pull requests

As we saw in the previous section, the CI pipeline built the code, did a test, ran a container, and verified that everything is OK. It then automatically raised a pull request to merge the code with the master branch. Now, we're in the release gating process. We want someone to manually verify whether the code is good and ready to be merged with the master branch or not. Apart from the CI workflow, we'll also use release gating in the Continuous Deployment (CD) workflow. As we know that the pull request is raised, let's go ahead and inspect the pull request and approve it.

Go to https://github.com/<your_user>/flask-app-gitops/pulls and you will see a pull request. Click on the pull request, and you will see the following:

Figure 14.3 – Pull request

We see that the pull request is ready to merge. Click on Merge pull request, and you will see that the changes will reflect onto the master branch...