Docker compose Cannot start service ratel

ERROR: for root_ratel_1 Cannot start service ratel: OCI runtime create failed: container_linux.go:349: starting container process caused “exec: “dgraph-ratel”: executable file no
t found in $PATH”: unknown

As of 21.03, Ratel is no longer bundled in with the Docker container that contains Dgraph. The reasons for doing this is to make the containers a bit smaller. In the meantime you can use play.dgraph.io as the ratel frontend. Or you can download Ratel and use it as a standalone program.