Hello,
I have a very simple Flask (Python) application. The Docker container builds and runs correctly locally.
When I deploy to Fly, it also starts correctly, and if I place a print() statement I can see that it is running.
However, it then immediately exits with code 0, as if the script has finished executing. There are no errors and warnings.
I’ve reduced the app to a minimum (just a route which returns 200). I’m assuming that something is wrong with my Fly configuration, but I’ve been unable to find out what’s wrong.
I’ve made sure that the app uses the correct port. Running fly doctor shows everything OK. I also have a Node app which is running just fine.
What am I doing wrong? What can I do to debug this further?
Logs:
2023-07-27T08:42:11.380 runner[123] ams [info] Pulling container image registry.fly.io/my-cool-app:deployment-123
2023-07-27T08:42:20.695 runner[123] ams [info] Successfully prepared image registry.fly.io/my-cool-app:deployment-123 (9.315107106s)
2023-07-27T08:42:21.351 runner[123] ams [info] Configuring firecracker
2023-07-27T08:42:22.788 app[123] ams [info] [ 0.040081] PCI: Fatal: No config space access function found
2023-07-27T08:42:23.014 app[123] ams [info] INFO Starting init (commit: 1d1821d)...
2023-07-27T08:42:23.094 app[123] ams [info] INFO Preparing to run: `/cnb/process/web` as 1000
2023-07-27T08:42:23.099 app[123] ams [info] INFO [fly api proxy] listening at /.fly/api
2023-07-27T08:42:23.115 app[123] ams [info] 2023/07/27 08:42:23 listening on [123:123]:22 (DNS: [123::3]:53)
2023-07-27T08:42:24.100 app[123] ams [info] INFO Main child exited normally with code: 0
2023-07-27T08:42:24.100 app[123] ams [info] INFO Starting clean up.
2023-07-27T08:42:24.101 app[123] ams [info] WARN hallpass exited, pid: 256, status: signal: 15 (SIGTERM)
2023-07-27T08:42:24.107 app[123] ams [info] 2023/07/27 08:42:24 listening on [123:123]:22 (DNS: [123::3]:53)
2023-07-27T08:42:25.102 app[123] ams [info] [ 2.350698] reboot: Restarting system
2023-07-27T08:42:25.534 runner[123] ams [info] machine exited with exit code 0, not restarting
fly.toml
app = "my-cool-app"
primary_region = "ams"
[build]
builder = "paketobuildpacks/builder:base"
[env]
PORT = "5000"
LOG_LEVEL = "debug"
FLASK_DEBUG = 1
[deploy]
strategy = "immediate"
[http_service]
internal_port = 5000
force_https = false
auto_stop_machines = false
auto_start_machines = true
min_machines_running = 0
processes = ["app"]
Dockerfile
FROM python:3.9
ENV LC_ALL=C.UTF-8
ENV LANG=C.UTF-8
ENV LANGUAGE=C.UTF-8
ENV PYTHONPATH "${PYTHONPATH}:/app/src"
ENV FLASK_DEBUG 1
ENV LOG_LEVEL "debug"
RUN pip install poetry
WORKDIR /app
COPY . /app
RUN poetry install --no-interaction --no-ansi
EXPOSE 5000
# CMD ["poetry", "run", "flask", "--app", "src/app.py", "run", "-h", "0.0.0.0"]
CMD ["poetry", "run", "gunicorn", "--bind", "0.0.0.0:5000", "app:create_app()"]