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+# Run
+
+## in Development
+`export FLASK_APP=run.py` 
+`export FLASK_ENV=development`
+`flask run`
+
+**Using gunicorn:** 
+
+`gunicorn --env SCRIPT_NAME=/watermarks -w 4 -b 127.0.0.1:5000 app:app --log-level debug`
+* `-w` workers
+* `-b` bind to address / unix socker
+
+**And gunicorn with using unix sock:** (this how it should run in production) 
+` gunicorn --env SCRIPT_NAME=/watermarks --workers 4 --bind unix:app.sock -m 007 app:app --log-level debug
+
+## in Production with gunicorn and unix sockets
+Based on https://medium.com/faun/deploy-flask-app-with-nginx-using-gunicorn-7fda4f50066a
+
+### systemd service file
+
+Add to /etc/systemd/system/watermarks.service
+
+```
+[Unit]
+After=network.target
+
+[Service]
+User=psc
+Group=www-data
+WorkingDirectory=/var/www/TacticalApp
+Environment="PATH=/var/www/TacticalApp/venv/bin"
+ExecStart=/var/www/TacticalApp/venv/bin/gunicorn --env SCRIPT_NAME=/watermarks --workers 4 --bind unix:app.sock -m 007 app:app
+
+[Install]
+WantedBy=multi-user.target
+```
+
+## enable  & start service file
+`systemctl enable watermarks.service`
+
+`systemctl start watermarks.service`
+
+It is also a good idea to check the status of the service
+`systemctl status watermarks.service`
+
+## Nginx config
+
+```
+location / {
+    # if using gunicorn with app sock, use:
+    proxy_pass http://unix:/var/www/TacticalApp/app.sock;
+    # if using gunicord with port 5000, use:
+    proxy_pass http://127.0.0.1:5000;
+    }
+```
+
+## debug.
+
+It might be helpful to enable gunicorn logging, while in development, to check what is going on,
+ by replacing in watermarks.service, the `ExecStart=` value with:
+ 
+`ExecStart=/var/www/TacticalApp/venv/bin/gunicorn --log-level debug --error-logfile /var/www/TacticalApp/app.log --workers 4 --bind unix:app.sock -m 007 app:app`
+
+And reloading the services
+`systemctl daemon-reload`
+
+`systemctl restart watermarks.service`
+
+and the start following app.log:
+`tail -f /var/www/TacticalApp/app.log`
+
+But in the long run logging should be disabled
+
+----
+09.06.2020 Handling url path /watermarks
+
+* gunicorn has to be started with argument `--env SCRIPT_NAME=/watermarks` which defines its path:
+`gunicorn --env SCRIPT_NAME=/watermarks --workers 4 --bind unix:app.sock -m 007 app:app --log-level debug`
+    * allows for the following URLs
+        * http://127.0.0.1/watermarks
+        * http://127.0.0.1/watermarks/uploadbook
+        * http://127.0.0.1/watermarks/about
+
+* added page /test `watermarks/test` for testing url_for() - correct
+* made urls relative
+* service file with `--env SCRIPT_NAME=/watermarks` see above
+*