Project 1: Spring Boot Banking App

Spring boot:

Spring Boot is used for building Java-based web applications quickly and easily, by providing pre-configured templates, tools, and libraries to set up, develop, and deploy production-ready applications with minimal effort. It simplifies the process of creating stand-alone, production-grade Spring-based applications.

Reference for code : (158) Code With GoldenCat - YouTube

PRE-REQUISITES FOR THIS PROJECT:

• AWS Account

• AWS Ubuntu EC2 instance (t2.medium)

• Install Docker

• Install docker compose

To clone the code from Git, you just need to copy a full version of a project from an online repository to your local machine. Here's how to do it in simple steps:

1. Copy the repository link: Go to the GitHub (or other Git service) page of the project and copy the link for cloning (usually found under a "Code" button).

2. Open your terminal: On your computer, open a terminal or command prompt.

3. Run the git clone command: Type git clone, paste the copied link, and press Enter. For example:

4. 

5. ls : This will display all the files and directories in the current location.

6. git clone to clone the code:

Pom.xml is similar to requirement.txt in python (pip install requirement.txt)

In Docker, both ENTRYPOINT and CMD are instructions used in a Dockerfile to define what command should run in a container. Although they are similar, they serve slightly different purposes.

Key Differences

• ENTRYPOINT defines the main command that will always run, while CMD provides defaults that can be overridden.

• If both ENTRYPOINT and CMD are defined, CMD will provide arguments to the ENTRYPOINT.

Example Combining ENTRYPOINT and CMD

DockerfileCopy codeENTRYPOINT ["python"]
CMD ["app.py"]

In Docker, you can add a user to a new group within a Docker container by using the usermod command in the Dockerfile or by specifying the group in the USER instruction. Here’s how you can do it:

The docker build command is used to create a Docker image from a Dockerfile and a context (a set of files at a specified location). Here’s a step-by-step guide on how it works and how to use it:

When you create a Spring Boot application and run it successfully, you will see a series of outputs in the console/logs indicating the progress and status of the application. Here’s what you can typically expect to see:

Next ,check the docker images via command docker images:

A Dockerfile is a text file containing instructions to build a Docker image. It defines the environment, dependencies, and commands needed to create a container that can run your application.

The docker run command is used to create and start a container from a Docker image. This is one of the main commands in Docker, as it allows you to take a pre-built image and run it as an isolated environment on your system. Here’s what it does and how to use it.

What docker run Does

• Creates a Container: docker run takes an image and creates a new container from it.

• Starts the Container: Once the container is created, docker run starts it, executing any commands defined in the image (like the CMD or ENTRYPOINT instructions in the Dockerfile).

• Allocates Resources: Docker allocates CPU, memory, network, and storage resources to the container.

• Isolates Environment: Each container runs independently, isolated from other containers and the host machine.

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  We need to take username as mentioned below:

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  Creating bridge network one :

Docker logs :

Final output. bank app is ready:

Spring Boot facilitates the quick development of Java web applications by providing pre-configured templates and tools. This guide outlines the prerequisites for a Spring Boot project, including setting up an AWS EC2 instance and installing Docker. It explains how to clone code from a Git repository and offers an overview of Dockerfile instructions like ENTRYPOINT and CMD. The guide also covers Docker commands such as `docker build` and `docker run`, which are essential for creating and running containers, and highlights the process of viewing Docker images and logs during application deployment.

Happy learning!