Lab for containerization and microservices workshop

Getting Started

Follow these steps to launch the Docker environment in GitHub Codespaces:

1. Fork the Repository

   Fork this repository to your GitHub account to create your own working copy.

2. Launch a Codespace

   Go to your forked repository on GitHub. Click on Code > Codespaces > Create codespace on main. Wait for the Codespace to initialize. The setup may take a few minutes.

3. Verify Docker Setup

   Once the Codespace is ready, open the terminal and run the following commands to verify that Docker and Docker Compose are available:

   foo@bar:~$docker --version
   foo@bar:~$docker-compose --version
   foo@bar:~$docker run hello-world
   

4. Run Your First Docker Container

   To test the Docker setup, you can run a sample NGINX container:

   foo@bar:~$docker run -d -p 8080:80 nginx
   

   Open the Ports tab in Codespaces to view and access the running NGINX container on port 8080.

5. Stopping and Cleaning Up

   When you’re done, stop any running containers with:

   foo@bar:~$docker stop <container_id>
   

### Running and Containerizing a Demo Application

Installation of Required Prerequisites and Libraries

• Install necessary tools and libraries

  An installation script is available in the repository.

  foo@bar:~$chmod +x ./setup_env.sh
  chmod +x ./setup_env.sh
  

Demo Application Setup

• The script prepares a demo application, PetClinic (GitHub Repository), written in the Spring Boot framework.

  As part of the setup, the application is built and a JAR file is generated.

Containerizing the Application

You need to containerize the application using following method (or find a different one):

1. Simple Solution

   • Use the available JAR artifact in the environment to containerize the application.

2. Deployment and running the application

   • Run the containerized application and expose it on port 8080.

Verification

• Check that the application is accessible in your browser.

⚠️ Critical Reminder: To avoid unexpected costs, always remember to STOP or DELETE your Codespace when you're done!
Leaving it running can lead to unnecessary charges, so make it a habit to shut down any unused Codespaces.