docker-compose up --scale SERVICE=NUM

[Smithx10]

Add the enhancement to allow for

--scale SERVICE=NUM
Scale SERVICE to NUM instances. Overrides the "scale" setting in the Compose file if present.

https://docs.docker.com/compose/reference/up/

[teutat3s]

Works fine here after a short test.

Tried adding scale: 2 to a docker-compose.yml service with version: '2.2' and tried the --scale flag with docker-compose up - didn't try if overriding works yet - but should do so, too.