This sample code helps get you started with a simple Flask web service deployed by AWS CodeDeploy and AWS CloudFormation to an Amazon EC2 server.
This sample includes:
- README.md - this file
- appspec.yml - this file is used by AWS CodeDeploy when deploying the web application to EC2
- buildspec.yml - this file is used by AWS CodeBuild to build and test your application
- requirements.txt - this file is used install Python dependencies needed by the Flask application
- setup.py - this file is used by Python's setuptools library to describe how your application will be packaged and installed
- scripts/ - this directory contains scripts used by AWS CodeDeploy when installing and deploying your application on the Amazon EC2 instance
- helloworld/ - this directory contains the Python source code for your Flask application
- tests/ - this directory contains unit tests for your application
- template.yml - this file contains the description of AWS resources used by AWS CloudFormation to deploy your infrastructure
- template-configuration.json - this file contains the project ARN with placeholders used for tagging resources with the project ID
These directions assume you want to develop on your your development environment or a Cloud9 environment, and not from the Amazon EC2 instance itself. If you're on the Amazon EC2 instance, the virtual environment is already set up for you, and you can start working on the code.
To work on the sample code, you'll need to clone your project's repository to your local computer. If you haven't, do that first. You can find instructions in the AWS CodeStar user guide at https://docs.aws.amazon.com/codestar/latest/userguide/getting-started.html#clone-repo.
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Create a Python virtual environment for your Django project. This virtual environment allows you to isolate this project and install any packages you need without affecting the system Python installation. At the terminal, type the following command:
$ virtualenv .venv -
Activate the virtual environment:
$ activate ./venv/bin/activate -
Install Python dependencies for this project:
$ pip install -r requirements.txt -
Install the sample application code into your virtual environment:
$ python setup.py install -
Start the Flask development server:
$ python helloworld/application.py --port 8000 -
Open http://127.0.0.1:8000/ in a web browser to view the output of your service.
Once you have a virtual environment running, you can start making changes to the sample Flask web service. We suggest making a small change to /src/application.py first, so you can see how changes pushed to your project's repository are automatically picked up by your project pipeline and deployed to the Amazon EC2 instance. (You can watch the pipeline progress on your project dashboard.) Once you've seen how that works, start developing your own code, and have fun!
To run your tests locally, go to the root directory of the sample code and run
the python setup.py pytest command, which AWS CodeBuild also runs through
your buildspec.yml file.
To test your new code during the release process, modify the existing tests or add tests to the tests directory. AWS CodeBuild will run the tests during the build stage of your project pipeline. You can find the test results in the AWS CodeBuild console.
Learn more about AWS CodeBuild and how it builds and tests your application here: https://docs.aws.amazon.com/codebuild/latest/userguide/concepts.html
Learn more about AWS CodeStar by reading the user guide. Ask questions or make suggestions on our forum.
User Guide: https://docs.aws.amazon.com/codestar/latest/userguide/welcome.html Forum: https://forums.aws.amazon.com/forum.jspa?forumID=248
To add AWS resources to your project, you'll need to edit the template.yml
file in your project's repository. You may also need to modify permissions for
your project's worker roles. After you push the template change, AWS CodeStar
and AWS CloudFormation provision the resources for you.
See the AWS CodeStar user guide for instructions to modify your template: https://docs.aws.amazon.com/codestar/latest/userguide/how-to-change-project.html#customize-project-template
AWS recommends you review the security best practices recommended by the framework author of your selected sample application before running it in production. You should also regularly review and apply any available patches or associated security advisories for dependencies used within your application.
Best Practices: https://docs.aws.amazon.com/codestar/latest/userguide/best-practices.html?icmpid=docs_acs_rm_sec