command: docker service scale
short: Scale one or multiple replicated services
long: |-
  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 the
  > [Swarm mode section](https://docs.docker.com/engine/swarm/) in the
  > documentation.
usage: docker service scale SERVICE=REPLICAS [SERVICE=REPLICAS...]
pname: docker service
plink: docker_service.yaml
options:
- option: detach
  shorthand: d
  value_type: bool
  default_value: "false"
  description: |
    Exit immediately instead of waiting for the service to converge
  deprecated: false
  min_api_version: "1.29"
  experimental: false
  experimentalcli: false
  kubernetes: false
  swarm: false
examples: |-
  ### Scale a single service

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

  ```bash
  $ docker service scale frontend=50

  frontend scaled to 50
  ```

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

  ```bash
  $ docker service create --mode global --name backend backend:latest

  b4g08uwuairexjub6ome6usqh

  $ docker service scale backend=10

  backend: scale can only be used with replicated mode
  ```

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

  ```bash
  $ docker service ls --filter name=frontend

  ID            NAME      MODE        REPLICAS  IMAGE
  3pr5mlvu3fh9  frontend  replicated  15/50     nginx:alpine
  ```

  You can also scale a service using the [`docker service update`](service_update.md)
  command. The following commands are equivalent:

  ```bash
  $ 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:

  ```bash
  $ docker service scale backend=3 frontend=5

  backend scaled to 3
  frontend scaled to 5

  $ docker service ls

  ID            NAME      MODE        REPLICAS  IMAGE
  3pr5mlvu3fh9  frontend  replicated  5/5       nginx:alpine
  74nzcxxjv6fq  backend   replicated  3/3       redis:3.0.6
  ```
deprecated: false
min_api_version: "1.24"
experimental: false
experimentalcli: false
kubernetes: false
swarm: true

