Build Docker image on Kubernetes using GitLab

GitLab: c2platform/examples/kubernetes/gitlab-docker-build 

This project demonstrates how we can build and release Docker image registry.gitlab.com/c2platform/examples/kubernetes/gitlab-docker-build on MicroK8s  Kubernetes cluster running on c2d-ks1 using GitLab Runner running in the cluster. In this project the GitLab Runner is installed in the namespace nja where the nj “helloworld” application is running.

• Overview
• Create Kubernetes cluster
• Install GitLab Runner
• Run pipeline

Overview

Create Kubernetes cluster

Create local Kubernetes cluster on c2d-ks.

• How-to Kubernetes 
• How-to Kubernetes Dashboard  ( optional but recommended)

Install GitLab Runner

In this project Shared Runners are of course turned off. The stages / jobs defined in .gitlab-ci.yml  in this project will be delegated to Kubernetes running locally which we can do by installing a GitLab Runner inside the cluster.

• How-to Install Gitlab Runner 

Run pipeline

Navigate to gitlab-docker-build pipelines  and select Run pipeline to run the pipeline and create and release a Docker image.

The following jobs are defined:

• Build: Builds the Docker image for the application
• Prepare: Prepares the environment for the pipeline
• Create release: Creates a release for the application (manual)
• Push latest: Pushes the Docker image with the latest tag to the registry
• Push tag: Pushes the Docker image with the tag name to the registry
• deploy: Deploys the application to production (manual)
• Test: Runs automated tests on the application
• sast: Runs security tests on the application