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Build and Run Docker Image

  1. Create new file in root directory of application. Name it Dockerfile.

  2. Write configurations as given in this file.

  3. Save the file. Open terminal and run command:

    docker build -t order-service .

    This will build a docker image named order-service from Dockerfile. It may take few minutes to finish the process.  

  4. Once finished, verify the image you built. To do so, run following command in terminal:

    docker images

    This will list out all docker images you have so far. Check whether order-service is there in the list.  

  5. To run docker container using this image, run command:

    docker run -d -p 12345:12345 --name order-container order-service

  6. To see the running containes, execute following command:

    docker ps

    You may see your order-container there.

  7. To test application, go to browser and browse for http://localhost:12345. You may see a message like Order-Management-Service is running on port 12345. You may now test api routes for various models using Postman.  

  8. To stop container, use command:

    docker stop order-container

    To remove container, run command:

    docker rm order-container

Docker Compose

To test whole application in containerized environment, you need to use Docker-compose. We need three containers i.e. database-container, application-container and either Zipkin or Jaeger container. So instead of running them separately, we can run them in one go using Docker-compose. To do so, follow these steps:

  1. Create a new file in root directory of application and name it docker-compose.yml.

  2. Write configurations for three containers in Yaml format. Refer this file.

  3. Once finished with configurations, save the file and open terminal. Run following command:

    docker compose up --build -d

    This command will pull docker images for MYSQL and Zipkin from docker hub and use them to run their containers and it will also build docker image of application using Dockerfile that we have already created.

  4. To see list of running containers, run command:

    docker compose ps

  5. Now you may access application at http://localhost:12345 and Zipkin UI at http://localhost:9411. Test application by sending Postman requests. You may see thr traces of your requests on Zipkin UI.

  6. To stop and remove all containers, run command:

    docker compose down