https://grafioschtrader.github.io/gt-user-manual/en/intro/installationupdate/dockerarchitecture/index.htmlA Docker installation of Grafioschtrader normally consists of three containers. A fourth container is added only when DuckDNS should keep a changing public IP address of the Docker host up to date. All containers belong to the same Docker Compose project and communicate through an internal network. Three or four containers? The web, backend, and mariadb containers are always required. The duckdns container is optional. The frontend does not require another container: the compiled Angular application is already included in the web container.Hugoen