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A simple Docker Compose Flask-Redis Application Built by Unixcloudtraining

Note:

This microservice simple app consists of 2 services:

  1. Frontend:
    1. HTML: Frontend app to load the final web site
  2. Backend:
    1. Redis: Remote Dictionary Server which is the bwill act as a cache memory
    2. Python: For computation & making requests to the Redis DB server

Requirements

  1. Docker engine & Docker compose
  2. Python3.x

Folder content

  1. index.html is the front-end communicating with the app.py file.
  2. app.py maps the application on port 8000 is the back-end logic responsible to pass data that have been processed and shared them
    with the index.html file it also gets the number of times the POST method was passed to to the Redis DB server.
  3. The requirements.txt file has the necessary dependencies for the imported modules(redis, flask) in the app.py file.
  4. Dockerfile exposes the application on port 5500 and contains the instructions to build the container image.
  5. .dockerignore will be used by the docker engine to ignore files you don't want to be present in the container image
  6. .gitignore is a list of files you don't want to appear in your repository.
  7. compose.yaml will be used by the docker compose engine to bring up your services to live.
  8. compose_state.sh is a helper script which contents a useful and rich set of options leading to give docker compose
    some instructions to rapidedly interact with your docker compose apps.

Possible issue during the implementation

If you face the below issue when trying to access your application via the browser http://localhost:8000 or http://host-ip:8000,
just remove and replace back the following variables as it worked for me: ip=ip, date_now=date_now, time_now=time_now
I am not really sure of why this error may occure and if do know please raise a PR with an update on this README.md

redis-1      | 1:M 18 Feb 2024 22:28:15.418 * Ready to accept connections tcp
flash_web-1  |  * Serving Flask app 'app.py'
flash_web-1  |  * Debug mode: on
flash_web-1  | WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
flash_web-1  |  * Running on all addresses (0.0.0.0)
flash_web-1  |  * Running on http://127.0.0.1:5000
flash_web-1  |  * Running on http://172.18.0.3:5000
flash_web-1  | Press CTRL+C to quit
flash_web-1  |  * Restarting with stat
flash_web-1  |  * Debugger is active!
flash_web-1  |  * Debugger PIN: 647-403-779
flash_web-1  | 172.18.0.1 - - [18/Feb/2024 16:30:01] "GET / HTTP/1.1" 500 -
flash_web-1  | Traceback (most recent call last):
flash_web-1  |   File "/usr/local/lib/python3.10/site-packages/flask/app.py", line 1488, in __call__
flash_web-1  |     return self.wsgi_app(environ, start_response)
flash_web-1  |   File "/usr/local/lib/python3.10/site-packages/flask/app.py", line 1466, in wsgi_app
flash_web-1  |     response = self.handle_exception(e)
flash_web-1  |   File "/usr/local/lib/python3.10/site-packages/flask/app.py", line 1463, in wsgi_app
flash_web-1  |     response = self.full_dispatch_request()
flash_web-1  |   File "/usr/local/lib/python3.10/site-packages/flask/app.py", line 872, in full_dispatch_request
flash_web-1  |     rv = self.handle_user_exception(e)
flash_web-1  |   File "/usr/local/lib/python3.10/site-packages/flask/app.py", line 870, in full_dispatch_request
flash_web-1  |     rv = self.dispatch_request()
flash_web-1  |   File "/usr/local/lib/python3.10/site-packages/flask/app.py", line 855, in dispatch_request
flash_web-1  |     return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  # type: ignore[no-any-return]
flash_web-1  |   File "/code/app.py", line 35, in web_app
flash_web-1  |     renderTemplate = render_template('index.html',color=color,ip=ip,clicks=clicks,time_now=time_now,date_now=date_now)
flash_web-1  | UnboundLocalError: local variable 'ip' referenced before assignment
flash_web-1  | 172.18.0.1 - - [18/Feb/2024 16:30:01] "GET /?__debugger__=yes&cmd=resource&f=style.css HTTP/1.1" 200 -
flash_web-1  | 172.18.0.1 - - [18/Feb/2024 16:30:01] "GET /?__debugger__=yes&cmd=resource&f=debugger.js HTTP/1.1" 200 -
flash_web-1  | 172.18.0.1 - - [18/Feb/2024 16:30:01] "GET /?__debugger__=yes&cmd=resource&f=console.png HTTP/1.1" 200 -
flash_web-1  | 172.18.0.1 - - [18/Feb/2024 16:30:01] "GET /?__debugger__=yes&cmd=resource&f=console.png HTTP/1.1" 304 -

I hope you learned a lot 🥳