Reusing Docker Layers with Spring Boot

Reusing Docker Layers with Spring Boot

In this Spring Boot tutorial, we'll see how to exploit the new capabilities of Spring Boot to reuse Docker layers. Docker is the de facto standard for creating self-contained applications. From version 2.3.0, Spring Boot includes several enhancements to help us create efficient Docker Images. Thus, it allows the decomposition of the application into different layers.

1. Introduction

Docker is the de facto standard for creating self-contained applications. From version 2.3.0, Spring Boot includes several enhancements to help us create efficient Docker Images. Thus, it allows the decomposition of the application into different layers.

In other words, the source code resides in its own layer. Therefore, it can be independently rebuilt, improving efficiency and start-up time. In this tutorial, we'll see how to exploit the new capabilities of Spring Boot to reuse Docker layers.

2. Layered Jars in Docker

Docker containers consist of a base image and additional layers. Once the layers are built, they'll remain cached. Therefore, subsequent generations will be much faster:

Changes in the lower-level layers also rebuild the upper-level ones. Thus, the infrequently changing layers should remain at the bottom, and the frequently changing ones should be placed on top.

In the same way, Spring Boot allows mapping the content of the artifact into layers. Let's see the default mapping of layers:

As we can see, the application has its own layer. When modifying the source code, only the independent layer is rebuilt. The loader and the dependencies remain cached, reducing Docker image creation and startup time. Let's see how to do it with Spring Boot!

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