Docker build running endlessly
I’m trying to build a docker image, but i’m running into an issue with uvicorn server running while building which causes it to never build.
so i’m looking for an alternative way of building/running the docker image.
Required the docker image should run the uvicorn server on startup
Haven’t found any real solution from browsing SOF/Google
Code
main.py file
from fastapi import FastAPI, Request, Response
from fastapi.templating import Jinja2Templates
from fastapi.staticfiles import StaticFiles
from src.scraper import Scraper
app = FastAPI()
templates = Jinja2Templates(directory="src/templates")
app.mount("/static", StaticFiles(directory="src/static"), name="static")
scraper = Scraper()
scraper.scrapedata()
@app.get("/")
async def home(request: Request):
return templates.TemplateResponse("index.html", {"request": request, "items": scraper.scrapedata()})
# if __name__ == "__main__":
# import uvicorn
# uvicorn.run(app, host="0.0.0.0", port=8000)
Dockerfile
FROM python:3.9.2-buster
ENV PYTHONDONTWRITEBYTECODEBYDEFAULT=1
ENV PYTHONUNBUFFERED=1
ENV PYTHONPATH "${PYTHONPATH}:/usr/src/"
COPY requirements.txt .
RUN python -m pip install --upgrade pip
RUN python -m pip install -r requirements.txt
WORKDIR /website
COPY . /website
RUN adduser -u 5678 --disabled-password --gecos "" webuser && chown -R webuser /website
USER webuser
EXPOSE 8000
#this is the cause for endless running. Any other way to do this?
RUN python -m uvicorn src.main:app --host 0.0.0.0 --port 8000
Console output
[+] Building 15.2s (11/12) [+] Building 974.8s (11/12) => [internal] load build definition from Dockerfile 0.1s => => transferring dockerfile: 512B 0.0s => [internal] load .dockerignore 0.0s => => transferring context: 34B 0.0s => [internal] load metadata for docker.io/library/python:3.9.2-buster 2.4s => [1/8] FROM docker.io/library/python:3.9.2-buster@sha256:56f1b4dbdebb3b6ec31126e256c0852d18e79909ed1df8b594e56 0.0s => [internal] load build context 0.2s => => transferring context: 135.50kB 0.2s => CACHED [2/8] COPY requirements.txt . 0.0s => CACHED [3/8] RUN python -m pip install --upgrade pip 0.0s => CACHED [4/8] RUN python -m pip install -r requirements.txt 0.0s => CACHED [5/8] WORKDIR /website 0.0s => [6/8] COPY . /website 0.3s => [7/8] RUN adduser -u 5678 --disabled-password --gecos "" webuser && chown -R webuser /website 5.5s => [8/8] RUN python -m uvicorn src.main:app --host 0.0.0.0 --port 8000 966.2s => => # 200 => => # INFO: Started server process [7] => => # INFO: Waiting for application startup. => => # INFO: Application startup complete. => => # INFO: Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
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Answer
Use CMD instead of RUN to launch the uvicorn server in the Dockerfile. It will retard the execution of the command to when the container is launched.
RUN runs commands during the image building.
CMD runs commands during container launching.
Your Dockerfile would be rewritten as follows:
FROM python:3.9.2-buster
ENV PYTHONDONTWRITEBYTECODEBYDEFAULT=1
ENV PYTHONUNBUFFERED=1
ENV PYTHONPATH "${PYTHONPATH}:/usr/src/"
COPY requirements.txt .
RUN python -m pip install --upgrade pip
RUN python -m pip install -r requirements.txt
WORKDIR /website
COPY . /website
RUN adduser -u 5678 --disabled-password --gecos "" webuser && chown -R webuser /website
USER webuser
EXPOSE 8000
CMD ["python", "-m", "uvicorn", "src.main:app", "--host", "0.0.0.0", "--port", "8000"]