docker-compose scale

Usage: scale [SERVICE=NUM...]

Sets the number of containers to run for a service.

Numbers are specified as arguments in the form service=num. For example:

docker-compose scale web=2 worker=3

Tip: Alternatively, in Compose file version 3.x, you can specify replicas under deploy as part of the service configuration for Swarm mode.

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https://docs.docker.com/v1.13/compose/reference/scale/