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Gain insights into building serverless applications on Kubernetes, using Knative, Tekton for CI/CD pipelines, and integrating GitHub for automated builds and deployments through GitHub events.

How to Build a Serverless App Platform on Kubernetes-01.png

knative.tar.gz

DigitalOcean Account

Install Knative

​​Businesses are modernizing and adopting multi-cloud approaches to deliver services. This shift in application deployment has given rise to containerization and Kubernetes for the deployment, management, and scaling of containerized applications. 

This course introduces you to serverless computing and shows you how to build serverless applications using Knative. It teaches CI/CD using Tekton and shows you how to build pipelines triggered by GitHub events. You will create a pipeline that builds container images using Build and, later, Cloud Native Buildpacks. 

In the last part of the course, you will build a web application that integrates with GitHub using a GitHub App, and triggers application build and deployment in response to GitHub events.

Building a Serverless App Platform on Kubernetes

# What are Docker and Dockerfile?
**Docker** enables developers to package, share, and run applications easily. As a platform, it has shaped the way we build and run applications, and containers have become the de facto standard for running applications. A **Docker container image** is a lightweight, standalone, executable package of software that includes everything needed to run an application: code, runtime, system libraries, and settings. To create a Docker container image, we need a Dockerfile.





A **Dockerfile** is a text document that contains the instructions to assemble a Docker image. When we tell Docker to build our image by executing the `docker build` command, Docker reads these instructions, executes them, and creates a Docker image. Writing Dockerfiles is one thing, and writing Dockerfiles optimized for a fast build and secure image as output is another. If we're not careful, we may create images that take a long time to build. Aside from the time it takes to build the image, they may also not be secure. We can learn how to secure and optimize our container image, but wouldn't we rather invest our time and resources in writing code that provides business value?

The premise of this course is about building a system that allows us to focus on our code with as little configuration as possible. In this chapter, we're going to learn how to build container images without Dockerfiles.

# What are Cloud Native Buildpacks?

**Cloud Native Buildpacks** are pluggable, modular tools that transform application source code into container images. They replace Dockerfiles in the app development lifecycle and enable swift rebasing of images and modular control over images (through the use of builders), among other things. Cloud Native Buildpacks enable developers to build images without Dockerfiles and with little to no configuration.



Learn about Docker, Dockerfile, Cloud Native Buildpacks, and how we can use Buildpacks to avoid the use of Docker.

Before We Begin

Introduction

Using Knative to Run Serverless Applications

CI/CD Using Tekton

Automate Tekton Pipeline Execution

Build Container Images without Dockerfile

Build the UI For the Platform

Docker and Cloud Native Buildpacks

What are Docker and Dockerfile?