Hey folks,
I’m migrating a Django app from Heroku and am having issues getting an initial successful deployment. My deploys are hanging at the “Monitoring deployment” stage before eventually failing after several minutes. The only way I’ve managed to complete the process is by using --strategy immediate, but the app doesn’t run once deployed in this way.
This is my fly.toml (I’ve commented out the release_command to try to isolate the problem):
app = "<myapp>-web"
kill_signal = "SIGTERM"
kill_timeout = 30
[env]
DJANGO_SETTINGS_MODULE = "<myapp>.config.production.settings"
[deploy]
# release_command = "django-admin migrate --noinput"
[[services]]
internal_port = 8080
protocol = "tcp"
[services.concurrency]
hard_limit = 25
soft_limit = 20
type = "requests"
[[services.ports]]
force_https = true
handlers = ["http"]
port = "80"
[[services.ports]]
handlers = ["tls", "http"]
port = "443"
[[services.http_checks]]
grace_period = "30s"
interval = "15s"
method = "get"
path = "/"
protocol = "http"
restart_limit = 0
timeout = "2s"
tls_skip_verify = false
Note that I added the http_checks section later because I was wondering if having no health checks meant my app could never be healthy. However that doesn’t seem to have made any difference.
This is my Dockerfile:
# syntax=docker/dockerfile:1
FROM python:3.8-slim as base
# Set up environment
ENV LANG=C.UTF-8
ENV LC_ALL=C.UTF-8
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONFAULTHANDLER=1
ENV PYTHONUNBUFFERED=1
ENV PIPENV_VENV_IN_PROJECT=1
# Start a new build stage to build dependencies
FROM base AS python-deps
# Install pipenv and compilation dependencies, including those for mysqlclient and pillow
RUN pip install pipenv
RUN apt-get update && apt-get install -y --no-install-recommends gcc build-essential python3-dev default-libmysqlclient-dev zlib1g-dev libjpeg62-turbo-dev libopenjp2-7-dev libtiff5-dev libwebp-dev libfreetype6 libfreetype6-dev
RUN apt-get clean
# Install python dependencies in /.venv
COPY Pipfile .
COPY Pipfile.lock .
RUN pipenv install --deploy
# Start a new build stage to receive the result of dependency installation
FROM base AS runtime
# Create and switch to a new user
RUN useradd --create-home --user-group appuser
WORKDIR /home/appuser
USER appuser
# Copy virtual env from python-deps stage
COPY --from=python-deps --chown=appuser:appuser /.venv /.venv
# Configure PATH to include venv bin directory, and PYTHONPATH to include app directory
# This mimics our previous use of `python setup.py develop`
ENV PATH="/.venv/bin:$PATH"
ENV PYTHONPATH="/home/appuser:$PYTHONPATH"
# Copy application into container
COPY . .
# Collect static files
RUN django-admin collectstatic --noinput --settings <myapp>.config.production.settings
# Expose port
EXPOSE 8080
# Run gunicorn
# note for readers – this was previously an ipv4-only binding
CMD ["gunicorn", "<myapp>.wsgi:application", "--bind", ":8080", "--workers", "4", "--access-logfile", "-", "--error-logfile", "-"]
The deploy process stops at the monitoring step for several minutes before failing:
==> Monitoring deployment
Logs: https://fly.io/apps/climb-bandits-api-web/monitoring
1 desired, 1 placed, 0 healthy, 1 unhealthy
--> v7 failed - Failed due to unhealthy allocations - not rolling back to stable job version 7 as current job has same specification and deploying as v8
--> Troubleshooting guide at https://fly.io/docs/getting-started/troubleshooting/
Error abort
I’ve tried building and running the Dockerfile locally and it seems to work fine. Additionally fly doctor reports no issues. Despite the release being marked as “unhealthy” there are no checks listed in fly checks:
Health Checks for <myapp>-web
NAME | STATUS | ALLOCATION | REGION | TYPE | LAST UPDATED | OUTPUT
-------*--------*------------*--------*------*--------------*---------
Most maddeningly, I don’t get any logs in the dashboard nor through fly logs.
What am I doing wrong? 
Thanks!
thanks for your help with this!