PLEASE READ HOW TO CLEAN UP YOUR DOCKER IMAGES AT THE BOTTOM OF THIS FILE AFTER DOING ALL OF THIS.
Make Dockerfile with this in it:
FROM python:3.7-alpine
WORKDIR /code
ENV FLASK_APP app.py
ENV FLASK_RUN_HOST 0.0.0.0
RUN apk add --no-cache gcc musl-dev linux-headers
COPY requirements.txt requirements.txt
RUN pip install -r requirements.txt
COPY . .
CMD ["flask", "run"]
Make sure everything you need is in your current folder and subdirectories if keeping COPY . . and all pip requirements are in requirements.txt. Minimally, need flask and redis in requirements.txt, but for PhenCards we have added several other packages.
Next to create the image (replace phencards with your site's name):
docker build -t phencards --network=host .
If you want to build an image with a more specific tag use:
docker build -t phencards:test --network=host .
To save the image to a TAR file to transfer to the main server:
docker save --output phencards.tar phencards
Load your image if you moved it from another server with:
docker load --input phencards.tar
Finally, to run the site via docker:
docker run -d -p 5003:5000 phencards
Adding -d runs it in the background.
If you have a volume you want to attach with -v, make sure the code in your scripts expects the Docker path. In our case:
docker run -d -p 5003:5000 -v /media/database:/database phencards
This will mount the folder in the droplet where we've stored the database /media/database to the path in the Docker image phencards /database. This way you don't need to build the database itself into the Docker image.
It should be at:
http://servername:5003
If you want to run an image with a specific tag use:
docker run -d -p 5001:5000 phencards:test.
If you want to start a server in port 5001, the command docker run -d -p 5001:5000 phencards should be used. This is because the first port value is the actual server port, the second one is inside the actual docker container and should always be 5000 unless you know specifically what ports you want to open in the docker container which can get more complex and requires further work.
To stop a docker container, check the container ID (something like 8a2652352336 when you docker ps), then do docker stop 8a2652352336. You can also use the shorthand name docker provides like "happy_platypus" or whatever name it assigns to the container. Like docker kill happy_platypus.
docker container prune
docker rmi -f `docker images | grep "<none>" | awk {'print $3'}`