Hello everybody I m still trying to figure out hot reload wi Pants #general

Hello everybody. I’m still trying to figure out ho...

bright-church-87196

05/01/2024, 12:39 PM

Hello everybody. I’m still trying to figure out hot reload with docker-compose, does anyone have any examples of things working? Attached in the comments my compose, Dockerfile and BUILDs

bright-church-87196

05/01/2024, 12:42 PM

Dockerfile

Copy code

FROM --platform="linux/amd64" python:3.11-slim

COPY src.python.backend/main.pex /bin/main
ENTRYPOINT ["/bin/main"]

Compose

Copy code

version: "3"
services:
  backend:
    container_name: xxxx-backend
    restart: unless-stopped
    image: xxxx-backend:latest
    ports:
      - "8000:8000"
    env_file:
      - .env.dev
    environment:
      - UVICORN_RELOAD=true

BUILDs

Copy code

docker_environment(
    name="python_base",
    image="python:3.11-slim",
    platform="linux_x86_64",
    python_bootstrap_search_path=[""],
)
docker_image(
    name="xxxx-backend",
    source="Dockerfile",
    restartable=True
)
python_sources(
    name="backend",
    restartable=True,
)

pex_binary(
    name="main",
    entry_point="main.py",
    dependencies=[":backend"],
    include_tools=True,
    environment="linux_docker", (references the env previously built)
    restartable=True,
)

With this setup I can run my image normally, but i’ve tried multiple different solutions I’ve seen here and can’t get hot reload working

bright-church-87196

05/01/2024, 12:43 PM

( I’m running on a M1 macbook, when I tried building without the docker environment, my container would never run because of missing dependencies )

lemon-eye-70471

05/01/2024, 4:00 PM

I was able to get hot reloading working with docker compose by setting the pex_binary layout to

'loose'

so that the PEX is an unpacked source folder then volume mapping the source code into the root of pex folder. So for your setup it might look like: BUILD

Copy code

pex_binary(
    name="main",
    entry_point="main.py",
    dependencies=[":backend"],
    include_tools=True,
    environment="linux_docker", (references the env previously built)
    restartable=True,
    layout='loose'
)

compose

Copy code

version: "3"
services:
  backend:
    container_name: xxxx-backend
    restart: unless-stopped
    image: xxxx-backend:latest
    ports:
      - "8000:8000"
    env_file:
      - .env.dev
    environment:
      - UVICORN_RELOAD=true
    volumes:
      - src/python/backend:/bin/main

bright-church-87196

05/02/2024, 2:19 PM

I had seen a message you sent on another thread, but unfortunately that did not work for me 😕 Maybe because of the environment I’m using

lemon-eye-70471

05/02/2024, 2:21 PM

How did it not work? What is the environment you're using?

bright-church-87196

05/02/2024, 2:24 PM

It still would not reload when I saved code.

Copy code

docker_environment(
    name="python_base",
    image="python:3.11-slim",
    platform="linux_x86_64",
    python_bootstrap_search_path=[""],
)

this env

lemon-eye-70471

05/02/2024, 2:30 PM

oh I see, the solution I found to work was to run the application code from the docker compose container rather than using

pants run

. I think in your case it'd be:

Copy code

docker compose run --rm --service-ports backend /bin/main

5 Views

Open in Slack

Previous Next