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95 lines
2.8 KiB
Markdown
95 lines
2.8 KiB
Markdown
<!--[metadata]>
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+++
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title = "Create a swarm"
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description = "Initialize the swarm"
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keywords = ["tutorial, cluster management, swarm mode"]
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[menu.main]
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identifier="initialize-swarm"
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parent="swarm-tutorial"
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weight=12
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+++
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<![end-metadata]-->
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# Create a swarm
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After you complete the [tutorial setup](index.md) steps, you're ready
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to create a swarm. Make sure the Docker Engine daemon is started on the host
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machines.
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1. Open a terminal and ssh into the machine where you want to run your manager
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node. For example, the tutorial uses a machine named `manager1`.
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2. Run the following command to create a new swarm:
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```bash
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docker swarm init --advertise-addr <MANAGER-IP>
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```
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>**Note:** If you are using Docker for Mac or Docker for Windows to test
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single-node swarm, simply run `docker swarm init` with no arguments. There is no
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need to specify ` --advertise-addr` in this case. To learn more, see the topic
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on how to [Use Docker for Mac or Docker for
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Windows](index.md#use-docker-for-mac-or-docker-for-windows) with Swarm.
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In the tutorial, the following command creates a swarm on the `manager1`
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machine:
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```bash
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$ docker swarm init --advertise-addr 192.168.99.100
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Swarm initialized: current node (dxn1zf6l61qsb1josjja83ngz) is now a manager.
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To add a worker to this swarm, run the following command:
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docker swarm join \
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--token SWMTKN-1-49nj1cmql0jkz5s954yi3oex3nedyz0fb0xx14ie39trti4wxv-8vxv8rssmk743ojnwacrr2e7c \
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192.168.99.100:2377
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To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.
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```
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The `--advertise-addr` flag configures the manager node to publish its
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address as `192.168.99.100`. The other nodes in the swarm must be able
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to access the manager at the IP address.
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The output includes the commands to join new nodes to the swarm. Nodes will
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join as managers or workers depending on the value for the `--token`
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flag.
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2. Run `docker info` to view the current state of the swarm:
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```bash
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$ docker info
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Containers: 2
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Running: 0
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Paused: 0
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Stopped: 2
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...snip...
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Swarm: active
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NodeID: dxn1zf6l61qsb1josjja83ngz
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Is Manager: true
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Managers: 1
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Nodes: 1
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...snip...
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```
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3. Run the `docker node ls` command to view information about nodes:
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```bash
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$ docker node ls
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ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS
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dxn1zf6l61qsb1josjja83ngz * manager1 Ready Active Leader
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```
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The `*` next to the node id indicates that you're currently connected on
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this node.
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Docker Engine swarm mode automatically names the node for the machine host
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name. The tutorial covers other columns in later steps.
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## What's next?
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In the next section of the tutorial, we'll [add two more nodes](add-nodes.md) to
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the cluster.
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