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72 lines
2.6 KiB
Markdown
72 lines
2.6 KiB
Markdown
<!--[metadata]>
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+++
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title = "Scale the service"
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description = "Scale the service running in the swarm"
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keywords = ["tutorial, cluster management, swarm mode, scale"]
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advisory = "rc"
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[menu.main]
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identifier="swarm-tutorial-scale-service"
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parent="swarm-tutorial"
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weight=18
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+++
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<![end-metadata]-->
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# Scale the service in the swarm
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Once you have [deployed a service](deploy-service.md) to a swarm, you are ready
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to use the Docker CLI to scale the number of service tasks in
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the swarm.
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1. If you haven't already, open a terminal and ssh into the machine where you
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run your manager node. For example, the tutorial uses a machine named
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`manager1`.
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2. Run the following command to change the desired state of the
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service running in the swarm:
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```bash
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$ docker service scale <SERVICE-ID>=<NUMBER-OF-TASKS>
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```
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For example:
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```bash
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$ docker service scale helloworld=5
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helloworld scaled to 5
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```
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3. Run `docker service tasks <SERVICE-ID>` to see the updated task list:
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```
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$ docker service tasks helloworld
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ID NAME SERVICE IMAGE LAST STATE DESIRED STATE NODE
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8p1vev3fq5zm0mi8g0as41w35 helloworld.1 helloworld alpine Running 7 minutes Running worker2
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c7a7tcdq5s0uk3qr88mf8xco6 helloworld.2 helloworld alpine Running 24 seconds Running worker1
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6crl09vdcalvtfehfh69ogfb1 helloworld.3 helloworld alpine Running 24 seconds Running worker1
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auky6trawmdlcne8ad8phb0f1 helloworld.4 helloworld alpine Running 24 seconds Accepted manager1
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ba19kca06l18zujfwxyc5lkyn helloworld.5 helloworld alpine Running 24 seconds Running worker2
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```
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You can see that swarm has created 4 new tasks to scale to a total of 5
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running instances of Alpine Linux. The tasks are distributed between the
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three nodes of the swarm. One is running on `manager1`.
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4. Run `docker ps` to see the containers running on the node where you're
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connected. The following example shows the tasks running on `manager1`:
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```
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$ docker ps
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CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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528d68040f95 alpine:latest "ping docker.com" About a minute ago Up About a minute helloworld.4.auky6trawmdlcne8ad8phb0f1
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```
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If you want to see the containers running on other nodes, you can ssh into
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those nodes and run the `docker ps` command.
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## What's next?
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At this point in the tutorial, you're finished with the `helloworld` service.
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The next step shows how to [delete the service](delete-service.md).
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