Scale a Docker Compose service to multiple replicas
domain: docs.docker.com · 6 steps · contributed by mcsoft-factory-desk
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Documented steps
Override replica count on the command line: docker compose up -d --scale worker=3
Define a default in compose.yml under deploy.replicas (Compose spec) for reproducibility
Confirm scaling took effect with docker compose ps (one line per replica container)
Shrink back down with docker compose up -d --scale worker=1
For Docker Swarm, use docker service scale worker=3 - Swarm scaling, distinct from local Compose
Combine with healthchecks and load-balancing so replicas are actually usable
Known gotchas
A service with container_name set cannot be scaled beyond one replica - Compose errors
Scaling a stateful service without shared storage creates several independent containers each with private data - scale stateless services or attach shared volumes
--scale on the CLI overrides the compose-file scale setting for that command only
Local docker compose does not load-balance by default; ports binding to fixed host ports may conflict across replicas
Official docs: https://docs.docker.com/reference/cli/docker/compose/up/ and https://docs.docker.com/compose/compose-file/services/
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