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moby--moby/docs/reference/commandline/service_scale.md
Stephen J Day 0aa4e1e689
cli: docker service|node|stack ps instead of tasks 
Rather than conflict with the unexposed task model, change the names of
the object-oriented task display to `docker <object> ps`. The command
works identically to `docker service tasks`. This change is superficial.

This provides a more sensical docker experience while not trampling on
the task model that may be introduced as a top-level command at a later
date.

The following is an example of the display using `docker service ps`
with a service named `condescending_cori`:

```
$ docker service ps condescending_cori
ID                         NAME                  SERVICE             IMAGE   LAST STATE              DESIRED STATE  NODE
e2cd9vqb62qjk38lw65uoffd2  condescending_cori.1  condescending_cori  alpine  Running 13 minutes ago  Running        6c6d232a5d0e
```

The following shows the output for the node on which the command is
running:

```console
$ docker node ps self
ID                         NAME                  SERVICE             IMAGE   LAST STATE              DESIRED STATE  NODE
b1tpbi43k1ibevg2e94bmqo0s  mad_kalam.1           mad_kalam           apline  Accepted 2 seconds ago  Accepted       6c6d232a5d0e
e2cd9vqb62qjk38lw65uoffd2  condescending_cori.1  condescending_cori  alpine  Running 12 minutes ago  Running        6c6d232a5d0e
4x609m5o0qyn0kgpzvf0ad8x5  furious_davinci.1     furious_davinci     redis   Running 32 minutes ago  Running        6c6d232a5d0e
```

Signed-off-by: Stephen J Day <stephen.day@docker.com>
2016-07-27 11:06:42 -07:00

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service scale

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

Scale one or multiple services

Options:
      --help   Print usage

Examples

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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