sample project with docker and python. Just for my own tinkering nothing to see here
faffing around getting the wsl setup too me about half the time... https://learn.microsoft.com/en-us/windows/wsl/setup/environment install wsl on local windows - note this just installed as root unlike ms docs say. I didn't bother creating a non-root user
wsl install
sudo apt update && sudo apt upgrade
install docker (just downloaded) python3 was on there already but installed 3.11
sudo apt install python3.11-fullalso had to reconfigure git via the following
git config --global --edit
later on to push had to use a PAT from github finally created a dev dir, created a new repo and cloned opened vs code via "code ." in the working dir
very basic setup as per app.py set up the venv and freeze the requirements
python3.11 -m venv venv --prompt .install flask and freeze the dependencies
Primarily following the first link
https://docs.docker.com/language/python/ https://docs.docker.com/language/python/build-images/
after creating the dockerfile build the image
docker build --tag python-docker-test .above command takes a bit of time as it's the full (not slim) python and ends up being ~1gb
then to run it
docker run --publish 8000:5000 python-docker-testat this point can see running in docker desktop and connect via localhost:8000. It will have been given a name
to run it in detached mode, providing a name
docker run -d -p 8000:5000 --name python-flask-docker python-docker-test
you can see everything in the docker desktop gui, or via commands
docker image ls
docker container ls
use docker stop/start (docker restart will stop (if running) and start)
run db in a different container, but use mounts to keep data outside of the container and so can persist outside the life of the container going for postgres rather than mysql https://hub.docker.com/_/postgres/ https://www.howtogeek.com/devops/how-to-deploy-postgresql-as-a-docker-container/
create the volume
docker volume create postgres_data
docker volume ls
note if you don't create a volume, running the postgres container did create an anonymous volume
create a docker network so both containers can communicate
docker network create my-app-network
docker network ls
now run the postgres container. the -rm flag will just remove the instance after it's stopped. -e is just an environment variable. Without specifying a version of postgres it just gets the latest (for a version, would have e.g. postgres:15 instead of postgres)
docker run --rm -d --name my_postgres --network my-app-network -p 5432:5432 -v postgres_data:/var/lib/postgresql/data -e POSTGRES_PASSWORD=passw0rd postgres
can interact with the db using psql...
docker exec -it my_postgres psql -U postgres
pip install psycopg2-binary
running the instance now with -rm so that it's removed once shut down
docker run -d --rm -p 8000:5000 --name python-flask-docker-dev --network my-app-network python-docker-test`
curl http://localhost:8000/initdatabase
in psql, connect to the inventory db, list the tables
\connect inventory;
\dt;
select * from widgets;the compose file has all the info to run both containers but all in a single file to run
docker compose -f docker-compose.dev.yml up --build
note that the containers then run as part of an overarching docker-test container
docker container ls
| CONTAINER ID | IMAGE | COMMAND | CREATED | STATUS | PORTS | NAME |
|---|---|---|---|---|---|---|
| 43a49b4474d7 | docker-test-web | "python -m flask run…" | 5 minutes ago | Up 5 minutes | 0.0.0.0:8000->5000/tcp | docker-test-web-1 |
| fe26056647cd | postgres | "docker-entrypoint.s…" | 5 minutes ago | Up 5 minutes | 0.0.0.0:5432->5432/tcp | docker-test-my_postgres-1 |