Warning: this command is part of the Swarm management feature introduced in Docker 1.12, and might be subject to non backward-compatible changes.

service scale

Usage:  docker service scale SERVICE=REPLICAS [SERVICE=REPLICAS...]

Scale one or multiple services

      --help   Print usage


Scale a service

If you scale a service, you set the desired number of replicas. Even though the command returns directly, actual scaling of the service may take some time.

For example, the following command scales the “frontend” service to 50 tasks.

$ docker service scale frontend=50
frontend scaled to 50

Directly afterwards, run docker service ls, to see the actual number of replicas

$ docker service ls --filter name=frontend

ID            NAME      REPLICAS  IMAGE         COMMAND
3pr5mlvu3fh9  frontend  15/50     nginx:alpine

You can also scale a service using the docker service update command. The following commands are therefore equivalent:

$ docker service scale frontend=50
$ docker service update --replicas=50 frontend

Scale multiple services

The docker service scale command allows you to set the desired number of tasks for multiple services at once. The following example scales both the backend and frontend services:

$ docker service scale backend=3 frontend=5
backend scaled to 3
frontend scaled to 5

$ docker service ls
ID            NAME      REPLICAS  IMAGE         COMMAND
3pr5mlvu3fh9  frontend  5/5       nginx:alpine
74nzcxxjv6fq  backend   3/3       redis:3.0.6


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