Introduction
Imagine you're a Java developer, building and deploying apps to run on on-premises servers. Orchestrating these servers, dependencies, and scale (to name a few) are all challenging processes.
Unlike virtual machines that emulate hardware, containers run directly on top of the host operating system, kernel, and hardware as essentially just another process. This means that containers require fewer system resources, resulting in a smaller footprint with substantially less overhead, faster app startup times, and a great use case for scaling on demand.
With Containers, you'll ensure your apps and dependencies are always isolated in container image(s) and ready for deployment at scale.
In this module, you'll first containerize a Java app. For convenience, we've selected an existing Java app for you to use. From the open internet and shared under the MIT license, Flight Booking System for Airline Reservations is a fully responsive, sample web-based Flight Booking System based on a sample airline, built with the Model View Controller (MVC) Architecture made using Java Servlets and Java Server Pages (JSPs).
You'll then construct a Dockerfile and write the Docker instructions needed to build a container image. Next, you'll run the container image locally and test the app. You'll then push the container image into Azure Container Registry and deploy it to Azure Kubernetes Service.
By the end of this module, you'll be able to containerize a Java app, push the container image to Azure Container Registry, and then deploy to Azure Kubernetes Service.
You'll use your own Azure subscription (with access to create, update, and remove resources) to deploy the resources in this module. If you don't have an Azure subscription, create a free account before you begin.
Important
To avoid unnecessary charges in your Azure subscription, remember to deprovision your Azure resources when you finish this module.
Learning objectives
By the end of this module, you'll be able to:
- Containerize a Java app.
- Build a container image for the Java app.
- Run the container image locally.
- Push the container image to Azure Container Registry.
- Deploy the container image to Azure Kubernetes Service.
Prerequisites
As a Java developer, you're already familiar with building apps. As you complete the exercises in this module, you'll use a personal Azure account. Make sure that you have the following resources:
- An Azure subscription with access to create, update, and remove resources
- Local installations of Docker CLI, Git CLI, and the Azure CLI (2.12 or later)