Here are two applications for backend server setup with flask and databases: mysql and redis both on docker service.

This is an example of docker containers for flask and mysql connection.
Please follow to the link and get more explanations:
https://medium.com/@waynewu_25577/docker-flask-mysql-%E5%9F%BA%E6%9C%AC%E4%B8%B2%E6%8E%A5%E6%95%99%E5%AD%B8-77eff0871954

1. To use: First open your terminal and locate in flask-mysql folder, then type in:

bash run.sh

It will start to build up every service.

2. Then, open your browser and type in:

http://0.0.0.0:5000/

You will first see an empty list for your current data, don't worry!! You can start to interact with the database by adding, updating and deleting the data.

POST: (Add Information)
curl -i -H "Content-Type: application/json" -X POST -d '{"title":"Test", "notify":"[email protected]"}' http://0.0.0.0:5000/

PUT: (Update Information)
curl -i -H "Content-Type: application/json" -X PUT -d '{"title":"Update", "is_completed":1, "notify":"[email protected]", "name":"Wayne"}' http://0.0.0.0:5000/<id>

GET: (Get Information)
curl -v http://0.0.0.0:5000/
curl -v http://0.0.0.0:5000/<id>

DELETE: (Delete Information)
curl -v -X DELETE http:/0.0.0.0:5000/
curl -v -X DELETE http:/0.0.0.0:5000/<id>

Then you can see some data on your browser. And also you can log in your database by typing in:

docker run -it --rm --network my-network mysql:5.7 sh -c 'exec mysql -h"mysql-server" -P"3306" -uroot -p"secret"'

We store our data in "mysql" database in docker container.

This is an example to send a request with some words to the server, and it will return a list of ten synonyms associated with those words.

1. To use: First open your terminal and locate in flask-redis folder, then type in:

bash startup.sh

It will start to build up every service.

2. Then, open your browser and send a request by typing in:

http://0.0.0.0:5000/get_synonym?word=[example]

Here [example], you can replace to any words you would like to search.
For example, type http://0.0.0.0:5000/get_synonym?word=she will return in a sequence as follows:
["hers", "woman", "mother", "lady", "girl", "mom", "never", "him", "mama", "roxanne"]