Deploy React Application using Tekton Pipelines

What is Tekton?

Tekton is a powerful and flexible open-source framework for creating CI/CD systems, allowing developers to build, test, and deploy across cloud providers and on-premise systems. It provides the primitive blocks necessary to build your own CI/CD workflows. It is one of the incubating projects from CD Foundation. In this post we’ll be building a CI/CD Pipeline from scratch for your React application.

In this blog I will be deploying Tekton Hub UI and the source code is present here.

Since Tekton is totally based on Kubernetes so we’ll start by first creating Kubernetes cluster on your system. We can install kubernetes using minikube or kind. You should also install kubectl so that you can interact with the kubernetes cluster.

We can now start our cluster using the following command:

$ minikube start --cpus=4 --memory=12g

I have kept the cpu count as 4 and memory as 12GB. You can change it as per your convenience or simply execute the command minikube start which will use default values.

Also enable the ingress controller by following the guide from here.

Now that we have cluster up and running, let’s install Tekton Pipelines (the core project). To install we need to execute the following kubectl command:

$ kubectl apply --filename

If you are using an OpenShift cluster and want to install the latest Pipelines then please follow the following process:

$ oc new-project tekton-pipelines
$ oc adm policy add-scc-to-user anyuid -z tekton-pipelines-controller
$ oc adm policy add-scc-to-user anyuid -z tekton-pipelines-webhook
$ oc apply --filename

Verify that the Pipelines Controller and Webhook pods are in running state by executing the command below

$ kubectl get pods -n tekton-pipelines   
tekton-pipelines-controller-749d876cf8-n547t 1/1 Running 0 50s
tekton-pipelines-webhook-7f9f848664-m6bkc 1/1 Running 0 50s

You can use kubectl or oc CLI as well to interact with Tekton but I’ll be showing the use of tkn CLI to install resuable Tasks from tektoncd/catalog which contains a collection of resuable Tekton resources which we can reuse directly from there instead of writing our own.

You can install tkn CLI from here depending on the OS and Arch which you are using. After the successful installation you can check the version by

$ tkn version
Client version: 0.17.0
Pipeline version: v0.22.0

Tasks which we are going to use in our Pipeline are:-

  • git-clone to clone the source code
$ tkn hub install task git-clone --version 0.2
  • npm to run tests
$ tkn hub install task npm --version 0.1
  • codecov for code coverage
$ tkn hub install task codecov --version 0.1
  • buildah to build and push the image to container registry
$ tkn hub install task buildah --version 0.2
  • kubernetes-actions to check whether there is an existing deployment or not.
$ tkn hub install task kubernetes-actions --version 0.2

you can now list the installed Tasks

$ tkn task list
buildah Buildah task builds... 4 minutes ago
codecov This task publishes... 4 minutes ago
git-clone These Tasks are Git... 4 minutes ago
kubernetes-actions This task is the ge... 4 minutes ago
npm This task can be us... 4 minutes ago

A Pipeline is a collection of Tasks that you define and arrange in a specific order of execution as part of your continuous integration flow.

The ui-pipeline will clone the source code, install required npm dependencies and store them in the external PVC. After this a few tests are run and if all the tests are green then code coverage will be uploaded to codecov. Also after successful completion of tests, the pipeline will start to build and push the container image to image registry. When the image is pushed to desired registry then the CI will check whether hub deployment exists or not. If it doesn’t exists then it create the required secrets and the deployment else it will patch the recently created image to the existing deployment. Below is the visualisation and code of above explained Pipeline :-

Pipeline for UI Deployment
$ kubectl apply --filename ui-pipeline.yaml

Create the necessary secrets which will upload the coverage report to codecov and push the image to desired registry.

Edit the above file with your credentials and apply the file

$ kubectl apply --filename secrets-and-sa.yaml

Also create the appropriate Role and RoleBinding so that we can deploy on the current cluster

$ kubectl create role hub-pipeline \   
--resource=deployment,services,pvc,job \
$ kubectl create rolebinding hub-pipeline \
--serviceaccount=default:quay-login \

A PipelineRun allows you to instantiate and execute a Pipeline on-cluster. A PipelineRun executes the Tasks in the Pipeline in the order they are specified until all Tasks have executed successfully or a failure occurs.

Edit the above file by providing your image name, tag, namespace and kubernetes variant (if using openshift) and apply it

$ kubectl apply --filename pipelinerun.yaml

The Pipeline will start running and in order to check the logs you can run

$ tkn pipeline logs -f
[fetch-repository : clone] + CHECKOUT_DIR=/workspace/output/
[fetch-repository : clone] + '[[' true '==' true ]]
[fetch-repository : clone] + cleandir
[fetch-repository : clone] + '[[' -d /workspace/output/ ]]
[fetch-repository : clone] + rm -rf /workspace/output// /workspace/output//LICENSE /workspace/output//OWNERS /workspace/output// /workspace/output//api /workspace/output// /workspace/output//config /workspace/output//config.yaml /workspace/output//docs /workspace/output//go.mod /workspace/output//go.sum /workspace/output//test /workspace/output//tools.go /workspace/output//ui /workspace/output//vendor
[fetch-repository : clone] + rm -rf /workspace/output//.git /workspace/output//.github /workspace/output//.gitignore /workspace/output//.yamllint
[fetch-repository : clone] + rm -rf '/workspace/output//..?*'
[fetch-repository : clone] + test -z
[fetch-repository : clone] + test -z
[fetch-repository : clone] + test -z
[fetch-repository : clone] + /ko-app/git-init -url -revision test-ci -refspec -path /workspace/output/ '-sslVerify=true' '-submodules=true' -depth 1
[fetch-repository : clone] {"level":"info","ts":1617594931.117907,"caller":"git/git.go:165","msg":"Successfully cloned @ 61c5eba4fbc924ed1d1ec44f5add0fbf5711961f (grafted, HEAD, origin/test-ci) in path /workspace/output/"}
[fetch-repository : clone] {"level":"info","ts":1617594931.1321423,"caller":"git/git.go:203","msg":"Successfully initialized and updated submodules in path /workspace/output/"}
[fetch-repository : clone] + cd /workspace/output/
[fetch-repository : clone] + git rev-parse HEAD
[fetch-repository : clone] + RESULT_SHA=61c5eba4fbc924ed1d1ec44f5add0fbf5711961f
[fetch-repository : clone] + EXIT_CODE=0
[fetch-repository : clone] + '[' 0 '!=' 0 ]
[fetch-repository : clone] + echo -n 61c5eba4fbc924ed1d1ec44f5add0fbf5711961f
[fetch-repository : clone] + echo -n

When the Pipeline finishes it’s execution successfully, you can check the deployment by running

$ kubectl get deployments -n tekton-hub

After the deployment is up and running you can visit the page by entering the url which you might have provided in the Ingress or OpenShift Route.

If you found this article insightful or of the slightest help, please give it a few claps. Feel free to reach out in case of any queries. Happy learning!

SDE @ Red Hat || Open Source || Tekton || Go

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