New post

Author: SimonTaylor

_posts/2024-10-26-dockerizing-spring-boot-apps.markdown

@@ -0,0 +1,60 @@
+---
+layout: post
+title:  "Dockerizing Spring Boot Apps"
+date:   2024-10-26 10:00:00 +0000
+author: Simon Taylor
+categories: spring docker
+permalink: /spring/docker/2024/10/26/dockerizing-spring-boot-apps
+excerpt: |
+  Creating a Docker image for a Spring Boot application allows you to containerize your app, making it easier to run in various environments without 
+  worrying about dependencies. In this blog, I'll guide you through creating a Docker image for a Spring Boot app using the 
+  [spt-development-demo project](https://github.com/spt-development/spt-development-demo) as a reference.
+  {: class="lead"}
+news: false
+---
+{{ page.excerpt | remove: '<span class="d-inline d-md-none d-xl-inline">' | remove: '</span>' }}
+
+## Steps to Create a Docker Image for Spring Boot Application
+{: class="fs-4" }
+
+### 1. Clone the Demo Project
+{: class="fs-5" }
+
+First, clone the `spt-development-demo` project from GitHub:
+
+{% gist 5255265b3e4f0c6d2e7adc61c81b7438 %}
+
+### 2. Build the Application with Spring Boot’s Built-in Docker Support
+{: class="fs-5" }
+
+Spring Boot’s `build-image` goal uses Cloud Native Buildpacks to package the application into a Docker image without needing a `Dockerfile`. Simply run the following command:
+
+{% gist d56b35801afef1e49957680bcaf0d123 %}
+
+This command builds the Docker image with the tag spt-development-demo using the JAR created by Spring Boot.
+
+### 3. Run the Docker Container
+{: class="fs-5" }
+
+Once the image is built, run it using Docker. Map port 8080 on your local machine to port 8080 in the container:
+
+{% gist b3168e2443c57f08c6f42c0853f1b722 %}
+
+After running this command, your Spring Boot application will be accessible at `http://localhost:8080`.
+
+### Optional: Push the Docker Image to a Registry
+{: class="fs-5" }
+
+If you want to share your Docker image, you can tag and push it to Docker Hub (or another container registry):
+
+1. Tag the image with your Docker Hub username:
+{% gist 4cfd14d2d1241a07b1a3e399b9385639 %}
+2. Push the image to Docker Hub:
+{% gist 92817e14676f6a5c689b5bdc96248708 %}
+
+## Conclusion
+{: class="fs-4" }
+
+Using Spring Boot’s built-in `build-image` support simplifies the Docker build process. With just a single Maven command, you can package your Spring Boot application as a Docker image without a `Dockerfile`. The `spt-development-demo` project demonstrates this easy method, making it a great choice for deploying Spring Boot apps in Docker.
+
+Happy containerizing!