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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

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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


# The `build-deploy` Pipeline
A **Pipeline** in Tekton is a collection of Tasks that we define and arrange in a specific order of execution. We'll create a Pipeline of the `build` and `deploy` Tasks we created earlier. We've already created a file named `pipeline-build-deploy.yaml`, as shown in the widget below.


The Pipeline definition defines some parameters it needs to be able to run. It consists of two Tasks: one to build an image and the other to deploy the service. Each Task must have a `name` and a `taskRef` that points to a Task available in the cluster. In the build-deploy Pipeline, we defined a Task named `build`, which references the `build` Task, and another named `deploy`, which references the `deploy` Task. We should see this in the `tasks` field in the Pipeline definition.

We can use the results from one Task as input for another Task. In our Pipeline, we used the `image` output from the `build` Task as the value for the `image` parameter of the `deploy` Task. We can use the syntax `$(tasks.<task>.results.<variable>)` to read the necessary variable from a Task result. On <b>lines 35 and 36</b>, we specified the value for the `image` parameter as follows:

```yaml
- name: image
  value: $(tasks.build.results.image)
```

Run the command given in `1_buildDeploy.sh` to create the build-deploy Pipeline.

The image below summarizes the process:

</variable></task>


# The `build-deploy` Pipeline
A **Pipeline** in Tekton is a collection of Tasks that we define and arrange in a specific order of execution. We'll create a Pipeline of the `build` and `deploy` Tasks we created earlier. We've already created a file named `pipeline-build-deploy.yaml`, as shown in the widget below.


The Pipeline definition defines some parameters it needs to be able to run. It consists of two Tasks: one to build an image and the other to deploy the service. Each Task must have a `name` and a `taskRef` that points to a Task available in the cluster. In the build-deploy Pipeline, we defined a Task named `build`, which references the `build` Task, and another named `deploy`, which references the `deploy` Task. We should see this in the `tasks` field in the Pipeline definition.

We can use the results from one Task as input for another Task. In our Pipeline, we used the `image` output from the `build` Task as the value for the `image` parameter of the `deploy` Task. We can use the syntax `＄(tasks.<task>.results.<variable>)` to read the necessary variable from a Task result. On <b>lines 35 and 36</b>, we specified the value for the `image` parameter as follows:

```yaml
- name: image
  value: $(tasks.build.results.image)
```

Run the command given in `1_buildDeploy.sh` to create the build-deploy Pipeline.

The image below summarizes the process:

</variable></task>

Let's the build and deploy Tasks using Tekton Pipelines directly through the manifest.

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

Create the Tekton Pipeline

The `build-deploy` Pipeline

Build the UI For the Platform

Create the Tekton Pipeline

The build-deploy Pipeline

The `build-deploy` Pipeline