This is a simple Flask app to experiment with Flask and Docker.
The Flask app is a simple app that returns,
Hello from Cyrus!
Code is in this repo and you can clone it to your local machine.
The Dockerfile is a simple Dockerfile that builds a Docker image based on the python:3.7-alpine image. It copies the app.py file to the /app directory and runs the app.py file.
To create the Docker image, run the following command:
docker build -t yourtag .
Replace yourtag with the tag you want to give to your image.
You can check if the image was created in the list of images:
docker images ls
To run the Docker image, we create a container(instance of docker image) from the image and map the port 5000 of the container to the port 5000 of the host.
docker run -d -p 5000:5000 yourtag
Replace yourtag with the tag you gave to your image.
To test the Flask app, open a browser and go to http://localhost:5000
To push the Docker image to Docker Hub, you need to create a repository on Docker Hub.
Then, you need to login to Docker Hub from the command line.
docker login
You will be prompted to enter your Docker Hub username and password.
Then, you need to tag the image with the name of your repository and push it to Docker Hub.
docker tag yourtag yourdockerhubusername/yourrepositoryname
docker push yourdockerhubusername/yourrepositoryname
Replace yourtag with the tag you gave to your image, yourdockerhubusername with your Docker Hub username and yourrepositoryname with the name of your repository.
If you go to your Docker Hub repository, you will see the image there.
Now that the image is on Docker Hub, you can pull it from Docker Hub to your local machine. Also, your colleagues can pull it from Docker Hub to their local machines.
To pull the image from Docker Hub, run the following command:
docker pull yourimage
To clean up, you can delete the container and the image from your local machine.
To delete the container, run the following command:
docker rm yourcontainerid
To delete the image, run the following command:
docker rmi yourimageid
Replace yourcontainerid with the id of your container and yourimageid with the id of your image.
In this tutorial, we created a simple Flask app and a Docker image for it. We pushed the Docker image to Docker Hub and pulled it from Docker Hub to our local machine. We also cleaned up by deleting the container and the image from our local machine.
I also wrote a simple tutorial on Docker and Djang, here
Documentation on Docker can be found here
If you have any questions or wamt to contribute to this repo, please contact me at cyruschegecc@gmail.com
Thank you and happy coding :)