When calling docker run, the tag's position is important. Everything after the tag is interpreted as the command to be run in the container, so the tag must go after the flags, but before any command being run in the container. Here there is no command, so it should go last
ubuntu@bh9-elasticsearch-tableau-connector:~$ docker run elasticsearch-tableau-connector -p 3000:3000
docker: Error response from daemon: OCI runtime create failed: container_linux.go:370: starting container process caused: exec: "-p": executable file not found in $PATH: unknown.
ERRO[0000] error waiting for container: context canceled
When calling docker run, the tag's position is important. Everything after the tag is interpreted as the command to be run in the container, so the tag must go after the flags, but before any command being run in the container. Here there is no command, so it should go last