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+## Docker-compose installation: Linux, Windows, Mac, Synology, QNAP
+
+EGroupware can be installed directly using Docker-compose, without the use of Linux DEB/RPM packages
+https://github.com/EGroupware/egroupware/tree/master/doc/docker#running-egroupware-in-docker
+
+You have to create an arbitrary directory where you place the docker-compose.yml and the nginx.conf file.
+In this example we use /etc/egroupware-docker, like the DEB/RPM packages:
+```
+mkdir /etc/egroupware-docker
+cd /etc/egroupware-docker
+curl https://raw.githubusercontent.com/EGroupware/egroupware/master/doc/docker/docker-compose.yml > docker-compose.yml
+curl https://raw.githubusercontent.com/EGroupware/egroupware/master/doc/docker/nginx.conf > nginx.conf
+# edit docker-compose.yml or nginx.conf, by default it will run on http://localhost:8080/
+mkdir data # this is where egroupware data is stored, it's by default a subdir of the directory of docker-compose.yml
+docker-compose up -d
+```
+
+### Docker Desktop for Mac notes
+* directories of volumes must be exported to Docker, by default only your home-directory is!
+* permissions of data directory must be writable by your user, as Docker daemon runs as that user!
+* db volume must NOT be a directory, as the networked access from Docker VM to the Mac is to slow!
+
+### Docker Desktop for Windows notes
+* you can NOT use $PWD to reference the docker-compose directory, use the full path with forward slashes!
+* directories of volumes must be exported to Docker!
+* db volume must NOT be a directory, as the networked access from Docker VM to Windows is to slow!
+
+### Docker on Linux
+* permissions of sources and data directory must be writable by www-data user (#33)
+
+### Synology installation
+It's recommened you create a volume ```egroupware``` for EGroupware data on the diskstation:
+Control panel >> Shared folder >> Create
+```
+Name: egroupware
+Description: EGroupware data and backups
+Location: choose a volume eg. "volume1"
+X Hide from network environment
+  Extended permisons
+  Activate Trash
+```
+Install the package "Docker" and ssh into the diskstation as admin
+```
+sudo su -
+<give admin password>
+mkdir /etc/egroupware-docker
+cd /etc/egroupware-docker
+curl https://raw.githubusercontent.com/EGroupware/egroupware/master/doc/docker/docker-compose.yml > docker-compose.yml
+curl https://raw.githubusercontent.com/EGroupware/egroupware/master/doc/docker/nginx.conf > nginx.conf
+ln -s /volume1/egroupware data # use the name of the volume you choose above
+docker-compose up -d
+docker-compose logs -f
+```
+Now you can use follow the installation process.
+
+To make EGroupware public accessible you need to create a port-forward on your router for ports 80 and 443, create a DNS entry for your external domain eg. ```egw.example.org``` and on the diskstation:
+Control panel >> Application portal >> Reverse proxy >> Create
+```
+Description: EGroupware
+Source
+Protocol: HTTPS
+Hostname: egw.example.org
+Port: 443
+  Activate HST (makes sense to activate, once everything is working!)
+X Activate HTTP/2
+  Access control (handled by EGroupware itself, do NOT activate)
+Target
+Protocol: HTTP
+Hostname: localhost
+Port: 8080 (unless a different port is specified in docker-compose.yml)
+```
+Control panel >> Security >> Certificates
+Create a Let's Encrypt certificate for the chosen domain ```egw.example.org``` (LE requires 80 AND 443!)
+
+EGroupware should then be accessible under https://egw.example.org