I'm following the Udemy course Docker and Kubernet: The Complete Guide and keep track of my progress here. The end-goal of the course is to build a simple dockerized Node.js web application that runs on AWS including an CI/CD pipeline running on Github and Travis CI. Instead of Node.js I will be using Flask to create the web server backend.
The code in this project is organized as follows:
- 0.web_simple
- 1.web_visit_counter
Section 4 of the course covers building a single-container docker application that simply prints 'Hi there'.
Run the below commands to boot up the application.
cd 0.web_simple
docker build -t <image_name> .
docker run -p 8080:5000 -e FLASK_APP=index.py <image_name>
You can then browse to http://127.0.0.1:8080/ where 'Hi there' is printed.
Section 5 covers building a multi-container docker application that counts the number of times a web app was visited. The application consists of a Python Flask app container as a web-server and a Redis container for storing the counter. Run the below commands to boot up the application.
cd 1.web_visit_counter/
docker-compose up -d
You can then browse to http://127.0.0.1:8080/ and refresh the page to update the visit counter. To stop the application execute
docker-compose down
Section 6 introduces volumes which allows for quick development because your code changes are immediately visible in the running Docker container. Furthermore, we introduce a production style setup where we integrate Flask with Nginx.
cd 2.nginx_flask_integration/
docker-compose up -d
You can then browse to http://127.0.0.1:8080/ where it shows the message from the text file
2.nginx_flask_integration/services/web/message.txt
By editing this file, you can control the text that is displayed on your web browser.
Simply refresh the browser to see your new message.
To stop the application execute
docker-compose down
In section 7 we cover how to set up an integrated pipeline for deploying a single container application to AWS Elastic Beanstalk. The pipeline is created by integrating GitHub with Travis CI and Elastic Beanstalk. The application is a simple Flask server that simply displays the content of
3.ci_cd_single_container/message.txt
Any commit on the master branch will trigger Travis CI to first run the unit tests.
If the unit tests are passed then the Elastic Beanstalk application is updated.
Important: the integration between GitHub and Travis CI is done by placing a '.travis.yml' file in the root directory of the repository.
The .travis.yml file for this application can be found in
3.ci_cd_single_container/.travis.yml