github.com/pwn-term/docker@v0.0.0-20210616085119-6e977cce2565/cli/docs/reference/commandline/service_scale.md (about)

     1  ---
     2  title: "service scale"
     3  description: "The service scale command description and usage"
     4  keywords: "service, scale"
     5  ---
     6  
     7  # service scale
     8  
     9  ```markdown
    10  Usage:  docker service scale [OPTIONS] SERVICE=REPLICAS [SERVICE=REPLICAS...]
    11  
    12  Scale one or multiple replicated services
    13  
    14  Options:
    15    -d, --detach                             Exit immediately instead of waiting for the service to converge (default true)
    16        --help   Print usage
    17  ```
    18  
    19  ## Description
    20  
    21  The scale command enables you to scale one or more replicated services either up
    22  or down to the desired number of replicas. This command cannot be applied on
    23  services which are global mode. The command will return immediately, but the
    24  actual scaling of the service may take some time. To stop all replicas of a
    25  service while keeping the service active in the swarm you can set the scale to 0.
    26  
    27  > **Note**
    28  >
    29  > This is a cluster management command, and must be executed on a swarm
    30  > manager node. To learn about managers and workers, refer to the
    31  > [Swarm mode section](https://docs.docker.com/engine/swarm/) in the
    32  > documentation.
    33  
    34  ## Examples
    35  
    36  ### Scale a single service
    37  
    38  The following command scales the "frontend" service to 50 tasks.
    39  
    40  ```bash
    41  $ docker service scale frontend=50
    42  
    43  frontend scaled to 50
    44  ```
    45  
    46  The following command tries to scale a global service to 10 tasks and returns an error.
    47  
    48  ```bash
    49  $ docker service create --mode global --name backend backend:latest
    50  
    51  b4g08uwuairexjub6ome6usqh
    52  
    53  $ docker service scale backend=10
    54  
    55  backend: scale can only be used with replicated or replicated-job mode
    56  ```
    57  
    58  Directly afterwards, run `docker service ls`, to see the actual number of
    59  replicas.
    60  
    61  ```bash
    62  $ docker service ls --filter name=frontend
    63  
    64  ID            NAME      MODE        REPLICAS  IMAGE
    65  3pr5mlvu3fh9  frontend  replicated  15/50     nginx:alpine
    66  ```
    67  
    68  You can also scale a service using the [`docker service update`](service_update.md)
    69  command. The following commands are equivalent:
    70  
    71  ```bash
    72  $ docker service scale frontend=50
    73  $ docker service update --replicas=50 frontend
    74  ```
    75  
    76  ### Scale multiple services
    77  
    78  The `docker service scale` command allows you to set the desired number of
    79  tasks for multiple services at once. The following example scales both the
    80  backend and frontend services:
    81  
    82  ```bash
    83  $ docker service scale backend=3 frontend=5
    84  
    85  backend scaled to 3
    86  frontend scaled to 5
    87  
    88  $ docker service ls
    89  
    90  ID            NAME      MODE        REPLICAS  IMAGE
    91  3pr5mlvu3fh9  frontend  replicated  5/5       nginx:alpine
    92  74nzcxxjv6fq  backend   replicated  3/3       redis:3.0.6
    93  ```
    94  
    95  ## Related commands
    96  
    97  * [service create](service_create.md)
    98  * [service inspect](service_inspect.md)
    99  * [service logs](service_logs.md)
   100  * [service ls](service_ls.md)
   101  * [service rm](service_rm.md)
   102  * [service rollback](service_rollback.md)
   103  * [service ps](service_ps.md)
   104  * [service update](service_update.md)