I have installed Openproject with Docker on a Raspberrypi 3 (running rapsbian stretch) that I use as a remote webserver (with Apache2). So far I have been able to follow the official guide, up to the configuration of the virtual webserver but when I try to access openproject from another computer (by visiting http;//openproject.mydomain.com I get the error 503 Service unavailable:The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.

I will try to include everything I did in the code snippet below, with the doubts I had along the way as comments.

##### 1) I wanted to install Openproject (OP) in /opt/openproject
cd /opt
git clone --depth=1 --branch=stable/10 https://github.com/opf/openproject
docker-compose up -d

##### 2) create a directory on host system to store data across container restarts
sudo mkdir -p /var/lib/openproject/{pgdata,static}
docker run -d -p 8080:80 --name openproject -e SECRET_KEY_BASE=secret \
  -v /var/lib/openproject/pgdata:/var/openproject/pgdata \  
  -v /var/lib/openproject/static:/var/openproject/assets \
  openproject/community:10
## Do /var/lib/openproject/pgdata and /var/lib/openproject/static be mapped to the location where I installed openproject (i.e. /opt/openproject) or do they refer to locations within the container?

docker stop openproject
docker start openproject

##### 3) I did not pass any environment variable because there seemed to be nothing that needed changing. However, I wonder how does Openproject connect to the database, for instace? Is it all done aoutomatically when running `docker compose -d`?

##### 4) If I run `docker ps` to list containers, I get 7 containers
openproject_proxy_1
openproject_seeder_1
openproject_web_1
openproject_worker_1
openproject_cron_1
openproject_cache_1
openproject_db_1

##### 5) Set `/etc/apache2/sites-available/openproject.conf` as follows:
<VirtualHost *:80>
	ServerName openproject.mydomain.com
	ServerAlias www.openproject.mydomain.com
	DocumentRoot /opt/openproject/public

	ErrorLog ${APACHE_LOG_DIR}/error-openproject.log
	CustomLog ${APACHE_LOG_DIR}/access-openproject.log combined

    RewriteEngine on
    RewriteCond %{HTTPS} !=on
    RewriteRule ^/?(.*)$ https://%{SERVER_NAME}/$1 [R,L]

    <Directory /home/openproject/openproject/public>
      # This relaxes Apache security settings.
      AllowOverride all
      # MultiViews must be turned off.
      Options -MultiViews
      # Uncomment this if you're on Apache >= 2.4:
      Require all granted
    </Directory>

    # Request browser to cache assets
    <Location /assets/>
      ExpiresActive On ExpiresDefault "access plus 1 year"
    </Location>
</VirtualHost>

##### 6) Set `/etc/apache2/sites-available/openproject-ssl.conf` as follows:
<VirtualHost *:443>
    ServerName openproject.federicopiovesan.com
    ServerAlias www.openproject.federicopiovesan.com

    SSLEngine on
	SSLCertificateFile /etc/ssl/certs/mydomain.pem
	SSLCertificateKeyFile /etc/ssl/private/mydomain.key

    RewriteEngine on
    RewriteRule "^$" "/" [R,L]

    ProxyRequests off

    ErrorLog ${APACHE_LOG_DIR}/error_openproject.log
	CustomLog ${APACHE_LOG_DIR}/access_openproject.log combined

    <Location "/">
      RequestHeader set X-Forwarded-Proto 'https'

      ProxyPreserveHost On
      ProxyPass http://127.0.0.1:8080/
      ProxyPassReverse http://127.0.0.1:8080/
    </Location>
</VirtualHost>

##### 7) Enable both websites and restart apache
sudo a2ensite openproject
sudo a2ensite openproject-ssl
sudo systemctl restart apache2