Building and pushing images with Docker

Introduction

Docker is an open platform for developing, shipping, and running applications. Docker enables you to separate your applications from your infrastructure so you can deliver software quickly.

With Docker, you manage your infrastructure in the same way you manage your applications. By taking advantage of Docker’s methodologies for shipping, testing, and deploying code quickly, you significantly reduce the delay between writing code and running in production.

Build and Push Online Boutique Application Images

In this section you will build and push to DOCR all required images for the online boutique demo project using docker CLI. A helper script is used to ease the process, named make-docker-images.sh.

Follow below steps to build and push online boutique demo application images using docker CLI:

Clone your microservices-demo repository if you haven't already (make sure to replace the <> placeholders first):
```
git clone https://github.com/<YOUR_GITHUB_ACCOUNT_USERNAME>/microservices-demo.git
```
From the command line, change directory to the microservices-demo folder (if not there already):
```
cd microservices-demo
```
Login to DOCR:
```
doctl registry login
```
Run the make-docker-images.sh script after setting required environment variables first:
```
export REPO_PREFIX="registry.digitalocean.com/microservices-demo"
export TAG="v1.0.0"

./release-scripts/make-docker-images.sh
```
Info

This script will go through each of the microservices and perform a docker build and a docker push tagging each image with the service name and the TAG environment variable exported above. You will be pushing an initial release first to DOCR - v1.0.0, and use that to deploy to the staging and production environments in the upcoming sections. Later on, GitHub Actions will take care of building, tagging and pushing images to DOCR.

Next, you have the option to study Cloud Native Buildpacks project to build and push docker images without having to write a single Dockerfile.

If not, skip to the Development Environment section where you will learn how to setup DOKS and deploy the microservices-demo application to your development environment, as well as configuring ingress and monitoring.