docker service scale (original) (raw)

SwarmThis command works with the Swarm orchestrator.

The scale command enables you to scale one or more replicated services either up or down to the desired number of replicas. This command cannot be applied on services which are global mode. The command will return immediately, but the actual scaling of the service may take some time. To stop all replicas of a service while keeping the service active in the swarm you can set the scale to 0.

Note

This is a cluster management command, and must be executed on a swarm manager node. To learn about managers and workers, refer to theSwarm mode section in the documentation.

Scale a single service

The following command scales the "frontend" service to 50 tasks.

The following command tries to scale a global service to 10 tasks and returns an error.

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

You can also scale a service using thedocker service updatecommand. The following commands are equivalent:

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: