Note that this isn't a production setup, but fairly close. Make sure to change the configuration if you intend to use it in production.
docker-compose up
# Note the errors in the console and http://localhost:8000/
# This is due to ttrss not having initialized the database, so:
docker exec -it ttrssdocker_ttrss_1 sh
mv /opt/ttrss/config.php /config.php
# open http://localhost:8000/install/ and get the database initialized
mv /config.php /opt/ttrss/config.php
# Now it should work, try logging in with the default admin/password
Look at the env vars available in the Dockerfile
and
cont-init.d/ttrss-config.sh
.