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Google Container Registry Build

In this step, let's utilize Tekton Pipelines to build containers and push to Google Container Registry (GCR).

Design the Task

Kaniko is a tool to build container images from a Dockerfile, inside a container in Kubernetes cluster. The advantage is that Kaniko doesn't depend on a Docker daemon. Let's create a generic Task to use Kaniko.

Take a look at task-build-docker-images-from-git-source.yaml file.

This defines a generic Task to use Kaniko to build and push the image.

Create the task:

kubectl apply -f task-build-docker-images-from-git-source.yaml

task.tekton.dev/build-docker-image-from-git-source created

Design the TaskRun

Next, let's define a TaskRun to run the Task.

Take a look at taskrun-build-helloworld-gcr.yaml file. This TaskRun defines the source code to build, the location of the image to push to and it refers to the Task we defined previously.

Run and watch the TaskRun

You can start the TaskRun with:

kubectl apply -f taskrun-build-helloworld-gcr.yaml

pipelineresource.tekton.dev/git-knative-tutorial unchanged
pipelineresource.tekton.dev/image-docker-knative-tutorial created
taskrun.tekton.dev/build-helloworld-docker created

Check that all the Tekton artifacts are created:

kubectl get tekton-pipelines

NAME                                                        AGE
pipelineresource.tekton.dev/git-knative-tutorial            12m
pipelineresource.tekton.dev/image-docker-knative-tutorial   22s
pipelineresource.tekton.dev/image-gcr-knative-tutorial      12m

NAME                                         SUCCEEDED   REASON      STARTTIME   COMPLETIONTIME
taskrun.tekton.dev/build-helloworld-gcr      True        Succeeded   12m         10m

NAME                                                 AGE
task.tekton.dev/build-docker-image-from-git-source   13m

Soon after, you'll see a pod created for the build:

kubectl get pods

NAME                                              READY   STATUS    RESTARTS   AGE
build-helloworld-docker-pod-a1d405                2/4     Running   0          61s

You can see the progress of the build with:

kubectl logs --follow --container=step-build-and-push <podid>

When the build is finished, you'll see the pod in Completed state:

kubectl get pods

NAME                                      READY     STATUS
build-helloworld-gcr-pod-3ed981            0/4       Completed

At this point, you should see the image pushed to GCR:

Google Container Registry