[PYTHON] Launch Flask application with Docker on Heroku
Introduction
About a month ago, leave the Docker image as it is Now that I can deploy it to Heroku, I tried it. It's still in public beta.
reference Container registry public beta - deploy Docker images to Heroku ContainerRegistryandRuntime
Preparation
The following is described assuming that it has already been completed.
- Install Docker
- Heroku account registration
- Install Heroku Toolbelt
Source
I used my own Flask application as the deployment target. https://github.com/nanakenashi/image_clock
It is a simple clock application that switches images according to the time of day.
image_clock/
├ static/
├ templates/
├ Dockerfile
├ app.py
└ requirements.txt
#Use Alpine Linux with Python as base image
FROM python:3.5.2-alpine
#git installation
RUN apk update
RUN apk add git
#Python package installation
ADD requirements.txt /tmp
RUN pip install -r /tmp/requirements.txt
#Place the source code
WORKDIR /web
RUN git clone https://github.com/nanakenashi/image_clock.git clock
#launch flask application
ENV FLASK_APP /web/clock/app.py
CMD flask run -h 0.0.0.0 -p $PORT
The point is the launch of the flask application.
- Set environment variables with ʻENV
instead ofRUN` - host is set to
0.0.0.0to match the IP of the execution environment - The port number in the Heroku environment is stored in the environment variable
PORT
procedure
Prior confirmation
Make sure the docker command is available
$ docker ps
Log in to Heroku.
$ heroku login
Source code placement
Get the source code from GitHub and change to the directory.
$ git clone https://github.com/nanakenashi/image_clock.git ./image_clock
$ cd image_clock
Creating a Heroku application
Secure a place for the application.
$ heroku create flask-clock-sample
At this stage, there is no sauce in it, so it's just a box.
When you access it, it looks like this. ↓
Docker container push
Build a container based on the Dockerfile and send it to the repository.
$ heroku container:push --app flask-clock-sample web
--app flask-clock-sample: Extract the container to the specified applicationweb: Specify the process type (weborworker) on Heroku
Operation check
$ heroku open --app flask-clock-sample
I was able to confirm the operation of the clock application.
Summary
Because the application used this time does not use add-ons I was able to set it up and deploy it very simply.
It seems to be a little more difficult to create a Heroku-like configuration such as DB connection and log organization.
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