Guide To Spring Boot With Docker

What Is Spring Boot With Docker?

Docker made application deployment easy and relatively fast, but how does it work? Well, the basic idea behind this is quite simple: It brings a part of your application to your computer (Container) instead of bracing a different target environment on each machine.

Creating containers reduces library version conflicting and also network ports overlapping. Images built-in Docker are immutable - there's no change in the working; your application will work in the same way on your teammate's computer as it works locally or in the cloud.

Also, Spring Boot with Docker made it possible to run multiple instances of a particular container on the same machine. This will bring down the cost of deployment by increasing the deployment density.

How to Bootstrap a Secure Spring Boot Application

It's pretty easy to Bootstrap a secure Spring Boot application with proper steps. So, here’s what you need to do. 

• First, you have to start with creating a Spring Boot application, and for this, you have to use the Spring Boot Initializr.
• Spring Boot Initializr can be used via the web interface or by using a handy curl command inscribed below- 

• On running this command, a request will be sent directly to Spring Boot Initializr to generate an application using the Kotlin programming language and Gradle build system. The developed application configures dependencies on both Okta Spring Web.

Location - To the springboot-docker-demo directory, your created project will get unpacked automatically.

For anywhere access, you have to update your main application class. You can add a controller that welcomes the user like "Welcome, guest!" where you need to allow unauthenticated access in WebSecurityConfigurerAdapter.

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How to Run Your Spring Boot Application

To run your Spring Boot application, you need to run a single command line, and that is it.

First, start your Spring Boot application in the project folder. This you can do using a simple command line: 

Now, after this, open a browser at http://localhost:8080. 

Your web application will open up with your added greeting, as shown below- 

This shows that your Spring Boot web application is functional and ready to deploy.

How to Build a Spring Boot Docker Image 

Spring Boot has supported Cloud-Native Buildpacks since version 2.3.0. Due to the large-scale population acquiring this technology, using Buildpacks for deploying web services to any popular clouds has become relatively straightforward. 

Step 1: Send the image to the associated local Docker daemon after building your application; the image given below renders a relevant idea of what to do:

Step 2: With Docker, commence your containerized or packed web application; the image given below provides an appropriate picturesque of what the next step is all about:

Presumably, your customized web Application will be accessible on http://localhost:8080 if you have followed proper steps. 

How to Secure Your Spring Boot 

User management has never been a primary aim of any developed application. It is never an easy task either. Hence, we have an Okta application to give you a helping hand. 

This application provides identity, which takes care of your work-routine such as Single Sign-On, social login, and implementing OAuth 2.0. It comes with excellent integration and attractive frameworks; it is well-reviewed, developer-friendly, and includes Spring Boot. 

Before you start, ensure you have a free developer account in Okta CLI. After installation of Okta, if you are new to Okta, sign up in Okta register for a new account. Else, directly log in if you already have an account in Okta.

1. After login, you have to run the Okta application. 
2. You must decide whether you want to change the app name as per your choice or stick to the default one, then simply move ahead. 
3. Now, select the "Web" option from the menu listed and press Enter.
4. Select "Other" and then change the Redirect URL to http://localhost:8080/login/oauth2/code/okta, and for the Logout Redirect URL, use: http://localhost:8080.

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How to Deploy Spring Boot Application in Docker Hub

Deployment of Spring Boot applications in the Docker hub is the most important process you should know when several users are working on the same project. 

Prerequisites:

• A 64-bit device
• A favorite IDE: STS (Spring Tool Suite)
• JDK 1.8 or above
• A Docker software (Docker Toolbox or Docker Desktop) to run docker commands. 

Here's what you have to do next. 

Step 1: First, create a Repository in Docker Hub. 

Step 2: Now, create a Spring Boot Application using STS. 

Step 3: Create a jar file of the application.

Step 4: After this, create a Docker file.

Step 5: Download and Install Docker Toolbox/Desktop. 

Step 6: Execute the Docker Commands.

Step 7: Lastly, execute the Docker Commands to Pull & Push Images, check the code below- 

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