github.com/AliyunContainerService/cli@v0.0.0-20181009023821-814ced4b30d0/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  
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    15  
    16  # service scale
    17  
    18  ```markdown
    19  Usage:  docker service scale [OPTIONS] SERVICE=REPLICAS [SERVICE=REPLICAS...]
    20  
    21  Scale one or multiple replicated services
    22  
    23  Options:
    24    -d, --detach                             Exit immediately instead of waiting for the service to converge (default true)
    25        --help   Print usage
    26  ```
    27  
    28  ## Description
    29  
    30  The scale command enables you to scale one or more replicated services either up
    31  or down to the desired number of replicas. This command cannot be applied on
    32  services which are global mode. The command will return immediately, but the
    33  actual scaling of the service may take some time. To stop all replicas of a
    34  service while keeping the service active in the swarm you can set the scale to 0.
    35  
    36  ## Examples
    37  
    38  ### Scale a single service
    39  
    40  The following command scales the "frontend" service to 50 tasks.
    41  
    42  ```bash
    43  $ docker service scale frontend=50
    44  
    45  frontend scaled to 50
    46  ```
    47  
    48  The following command tries to scale a global service to 10 tasks and returns an error.
    49  
    50  ```bash
    51  $ docker service create --mode global --name backend backend:latest
    52  
    53  b4g08uwuairexjub6ome6usqh
    54  
    55  $ docker service scale backend=10
    56  
    57  backend: scale can only be used with replicated mode
    58  ```
    59  
    60  Directly afterwards, run `docker service ls`, to see the actual number of
    61  replicas.
    62  
    63  ```bash
    64  $ docker service ls --filter name=frontend
    65  
    66  ID            NAME      MODE        REPLICAS  IMAGE
    67  3pr5mlvu3fh9  frontend  replicated  15/50     nginx:alpine
    68  ```
    69  
    70  You can also scale a service using the [`docker service update`](service_update.md)
    71  command. The following commands are equivalent:
    72  
    73  ```bash
    74  $ docker service scale frontend=50
    75  $ docker service update --replicas=50 frontend
    76  ```
    77  
    78  ### Scale multiple services
    79  
    80  The `docker service scale` command allows you to set the desired number of
    81  tasks for multiple services at once. The following example scales both the
    82  backend and frontend services:
    83  
    84  ```bash
    85  $ docker service scale backend=3 frontend=5
    86  
    87  backend scaled to 3
    88  frontend scaled to 5
    89  
    90  $ docker service ls
    91  
    92  ID            NAME      MODE        REPLICAS  IMAGE
    93  3pr5mlvu3fh9  frontend  replicated  5/5       nginx:alpine
    94  74nzcxxjv6fq  backend   replicated  3/3       redis:3.0.6
    95  ```
    96  
    97  ## Related commands
    98  
    99  * [service create](service_create.md)
   100  * [service inspect](service_inspect.md)
   101  * [service logs](service_logs.md)
   102  * [service ls](service_ls.md)
   103  * [service rm](service_rm.md)
   104  * [service rollback](service_rollback.md)
   105  * [service ps](service_ps.md)
   106  * [service update](service_update.md)