Update 'Quick Guide to publishing websites on hal.elte.hu with Python3 backend'

Quick-Guide-to-publishing-websites-on-hal.elte.hu-with-Python3-backend.md

@@ -101,7 +101,7 @@ By going to **localhost/your_app** in your browser you should be able to see now
 
 # Testing your website with Docker
 Since the site on hal.elte.hu will run inside a Docker container, before publishing you should test your work locally. To install Docker visit [this](https://docs.docker.com/get-docker/) link.
-Once Docker is up and running, you should make a new project folder **DO NOT USE /var/www/html/!**, and copy `your_app.conf` and the `your_app folder` from `/var/www/html/` inside. Once you're done adding some other scirpts detailed a little further, the folder struture should look like this:
+Once Docker is up and running, you should make a new project folder **DO NOT USE /var/www/html/!**, and copy `your_app.conf` and the `your_app folder` from `/var/www/html/` inside. (You should omit copying the venv.) Once you're done adding some other scirpts detailed a little further, the folder struture should look like this:
 > |----/your_app_docker/  
 > |-----------------your_app.conf  
 > |-----------------Dockerfile --> **We’ll make this later**  
@@ -115,6 +115,75 @@ Once Docker is up and running, you should make a new project folder **DO NOT USE
 > |-------------------------templates/  
 > |-----------------------------main.html  
 > |----------------------------- (…)  
-> |-------------------------venv/  
 > |-------------------------main.py  
 > |------------------------- (…)  
+
+To make the missing files:
+#### `Dockerfile` (NO EXTENSION)
+```
+ARG pyversion=3.9
+FROM python:${pyversion}-bullseye
+ARG pyversion=3.9
+ENV PYVERSION ${pyversion:-3.9}
+
+# Install packages
+RUN apt-get -yqq update && \
+    apt-get -yqq install apache2 apache2-dev locales libapache2-mod-wsgi-py3 && \
+    apt-get clean
+
+# Install locale
+COPY ./locale.gen /etc/locale.gen
+RUN locale-gen
+
+COPY your_app /var/www/html/your_app
+
+RUN chown -R www-data:www-data /var/www/
+RUN chmod -R 755 /var/www/
+
+USER www-data
+
+# Prepare virtualenv
+WORKDIR /var/www/html/your_app/your_app/
+COPY ./requirements.txt .
+RUN python3 -m venv ./venv
+RUN . ./venv/bin/activate
+RUN ./venv/bin/pip install --upgrade pip setuptools
+RUN ./venv/bin/pip install -r ./requirements.txt
+
+# Configure Apache
+USER root
+COPY ./start-apache.sh /
+RUN a2dismod mpm_event && a2enmod mpm_prefork
+COPY ./your_app.conf /etc/apache2/sites-available/000-default.conf
+
+# Start Apache
+EXPOSE 80
+CMD ["/bin/sh", "/start-apache.sh"]
+```
+Make sure that `your_app` is replaced with the name of your folder, and the paths are the same, as in the folder structure above.
+#### `start_apache.sh`
+```
+#!/bin/sh
+
+set -e
+
+. /etc/apache2/envvars
+ulimit -n 8192
+chown root:www-data /var/lock/apache2
+chown -R www-data:www-data /var/www/html
+exec /usr/sbin/apache2 -k start -DFOREGROUND
+```
+#### `locale.gen`
+```
+hu_HU.UTF-8 UTF-8
+
+```
+Add here other languages as needed.
+
+With everything in place go to `/your_app_docker` and run the following commands:
+1. Build an image: `docker build --rm  -t your_app_img .`
+2. Run the container: `docker run -d --name your_app -p 8085:80 your_app_img`
+
+Then you should be able to access your website at **localhost:8085/your_app**. Once you're done you can stop and remove both the container and the image.
+
+# Upload your project to Gitea