Overview

In this demo, we will go through the basics of Google Tekton and build Tekton pipeline to build container images using Kaniko and publish them to dockerhub.

Goal

Creating a pipeline for building and publishing Container images.

Overview

Tekton Pipelines is an OpenSource project by Google to Build, Run and Maintain CI/CD pipelines for Kubernetes Apps and provides k8s-style resources declaration for CI/CD-style pipelines. Tekton Pipelines are built using Kubernetes CRD’s, it is based on Operator model.

• Steps are fundamental blocks of Pipelines. A step is actually an instance of an image and it is Kubernetes container spec. step contains the actual work to be done.

• Tasks contain a series of steps to be executed in sequential order on the same node, so they can share resources i.e. output/artifacts/parameters of one step to another. Tasks can exist and be invoked completely independently of Pipelines; they are highly cohesive and loosely coupled. Tasks can be invoked via TaskRuns

• Pipelines lets you put together the tasks, so they can run concurrently/Sequentially. They are not guaranteed to execute on the same node, it depends on K8S’s scheduling of pods. But you can have inputs for one task that come from the output of another task, which is specified in the pipeline. They can be triggered by events or by manually creating PipelineRuns

• Pipelines and tasks are declared once and they are used again and again. We create TaskRuns and PipelineRuns to invoke Tasks and PipelineRuns.

• PipelineResources are the artifacts used as inputs and outputs of Tasks.

Getting Started

Login to server with username summit and password as summit.

ssh summit@IPADRESS

Naviagte to /home/summit/src

cd /home/summit/src/shanghai-summit/tekton

Let’s set your name variable as a environment variable, So docker image can be pushed with your name as tag. Note: Replace with your name.

export name=<YOURNAME>
Example: export name=chris

Steps to Execute

1. Install Tekton. This command downloads and Installs v0.7.0 version of Tekton

   ./tekton.sh deploy_tekton
   

2. Create Docker Registry Secret and Service Account

   ./tekton.sh docker_registry
   

3. Now create PipelineResource for Github and DockerHub. Here we specify our git repository and Project in DockerHub where images are pushed

   ./tekton.sh create_PipelineResource
   

4. Now Create a Task which downloads our repo specified in above step from github and using the Dockerfile from the downloaded repo, it builds Image using kaniko.

   ./tekton.sh create_Task
   

5. Now Create TaskRun to run above pipeline

   ./tekton.sh create_TaskRun
   

6. To see all the resource created so far as part of Tekton Pipelines, run the command

   kubectl get tekton-pipelines
   

welcome image is pushed with your name as tag. Check DockerHub for the image with your tag