-
FROM python:3.10.0-slim-buster
: This line specifies the base image for this Docker image, which ispython:3.10.0-slim-buster
. This is a slim version of the official Python 3.10 image based on Debian Buster. -
ENV APP_HOME=/app
: This line sets the environment variableAPP_HOME
to/app
. -
RUN mkdir $APP_HOME
: This line creates a new directory in the Docker image at the path specified by theAPP_HOME
environment variable. -
RUN mkdir $APP_HOME/staticfiles
: This line creates a new directory calledstaticfiles
within theAPP_HOME
directory. -
WORKDIR $APP_HOME
: This line sets the working directory of the Docker image to theAPP_HOME
directory. -
LABEL maintainer="[email protected]"
: This line sets a label in the Docker image with the maintainer information. -
LABEL description="development image for real estate project"
: This line sets a label in the Docker image with a brief description of the image. -
ENV PYTHONDONTWRITEBYTECODE 1
: This line sets an environment variable to prevent Python from writing.pyc
files. -
ENV PYTHONUNBUFFERED 1
: This line sets an environment variable to enable unbuffered Python output. -
RUN apt-get update && apt-get install -y build-essential \
: This line updates the package lists for the base image and installs thebuild-essential
package. -
&& apt-get install -y libpq-dev && apt-get install -y gettext \
: This line continues the previous line by installing thelibpq-dev
andgettext
packages. -
&& apt-get install -y netcat gcc postgresql \
: This line continues the previous line by installing thenetcat
,gcc
, andpostgresql
packages. -
&& apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false \
: This line removes any unused packages and dependencies from the image to reduce its size. -
&& rm -f /var/lib/apt/lists/*
: This line removes the package lists from the image to reduce its size. -
COPY ./requirements.txt /app/requirements.txt
: This line copies therequirements.txt
file from the host machine to theAPP_HOME
directory in the Docker image. -
RUN pip3 install --upgrade pip
: This line upgradespip
to the latest version. -
RUN pip3 install -r requirements.txt
: This line installs the Python packages specified in therequirements.txt
file. -
COPY ./docker/local/django/entrypoint /entrypoint
: This line copies theentrypoint
script from the host machine to the root directory of the Docker image. -
RUN sed -i 's/\r$//g' /entrypoint
: This line removes any Windows line endings from theentrypoint
script. -
RUN chmod +x /entrypoint
: This line makes theentrypoint
script executable. -
COPY ./docker/local/django/start /start
: This line copies thestart
script from the host machine to the root directory of the Docker image. -
RUN sed -i 's/\r$//g' /start
: This line removes any Windows line endings from thestart
script. -
RUN chmod +x /start
: This line makes thestart
script executable. -
ENTRYPOINT [ "/entrypoint"]
This line sets the entrypoint of the container to the /entrypoint script.
The ENTRYPOINT
instruction specifies the command that will be run when a container is started from the image. In this Dockerfile, the entrypoint is set to /entrypoint
.
The /entrypoint
script is a custom script that is copied into the container, and it is used to set up the environment for the container. Specifically, it sets environment variables and runs any necessary migrations or other setup tasks for the Django application.
By setting the ENTRYPOINT
to /entrypoint
, any command that is passed to the container will be appended to this script, allowing the script to run before the command is executed. This is a common pattern in Dockerfiles for running setup tasks before the main command is executed.