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Dockerfile

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+# Use an official Python runtime based on Debian 10 "buster" as a parent image.
+FROM python:3.8.1-slim-buster
+
+# Add user that will be used in the container.
+RUN useradd wagtail
+
+# Port used by this container to serve HTTP.
+EXPOSE 8000
+
+# Set environment variables.
+# 1. Force Python stdout and stderr streams to be unbuffered.
+# 2. Set PORT variable that is used by Gunicorn. This should match "EXPOSE"
+#    command.
+ENV PYTHONUNBUFFERED=1 \
+    PORT=8000
+
+# Install system packages required by Wagtail and Django.
+RUN apt-get update --yes --quiet && apt-get install --yes --quiet --no-install-recommends \
+    build-essential \
+    libpq-dev \
+    libmariadbclient-dev \
+    libjpeg62-turbo-dev \
+    zlib1g-dev \
+    libwebp-dev \
+ && rm -rf /var/lib/apt/lists/*
+
+# Install the application server.
+RUN pip install "gunicorn==20.0.4"
+
+# Install the project requirements.
+COPY requirements.txt /
+RUN pip install -r /requirements.txt
+
+# Use /app folder as a directory where the source code is stored.
+WORKDIR /app
+
+# Set this directory to be owned by the "wagtail" user. This Wagtail project
+# uses SQLite, the folder needs to be owned by the user that
+# will be writing to the database file.
+RUN chown wagtail:wagtail /app
+
+# Copy the source code of the project into the container.
+COPY --chown=wagtail:wagtail . .
+
+# Use user "wagtail" to run the build commands below and the server itself.
+USER wagtail
+
+# Collect static files.
+RUN python manage.py collectstatic --noinput --clear
+
+# Runtime command that executes when "docker run" is called, it does the
+# following:
+#   1. Migrate the database.
+#   2. Start the application server.
+# WARNING:
+#   Migrating database at the same time as starting the server IS NOT THE BEST
+#   PRACTICE. The database should be migrated manually or using the release
+#   phase facilities of your hosting platform. This is used only so the
+#   Wagtail instance can be started with a simple "docker run" command.
+CMD set -xe; python manage.py migrate --noinput; gunicorn blog.wsgi:application

manage.py

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+#!/usr/bin/env python
+import os
+import sys
+
+if __name__ == "__main__":
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "blog.settings.dev")
+
+    from django.core.management import execute_from_command_line
+
+    execute_from_command_line(sys.argv)