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Signed-off-by: Charles Smith <charles.smith@docker.com> (cherry picked from commit 9594ac97ce0c6e0777716be2a35b47208d440e8e) Signed-off-by: Tibor Vass <tibor@docker.com>
68 lines
2.0 KiB
Markdown
68 lines
2.0 KiB
Markdown
<!--[metadata]>
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title = "node update"
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description = "The node update command description and usage"
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keywords = ["resources, update, dynamically"]
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[menu.main]
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parent = "smn_cli"
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+++
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<![end-metadata]-->
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**Warning:** this command is part of the Swarm management feature introduced in Docker 1.12, and might be subject to non backward-compatible changes.
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## update
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```markdown
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Usage: docker node update [OPTIONS] NODE
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Update a node
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Options:
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--availability string Availability of the node (active/pause/drain)
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--help Print usage
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--label-add value Add or update a node label (key=value) (default [])
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--label-rm value Remove a node label if exists (default [])
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--membership string Membership of the node (accepted/rejected)
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--role string Role of the node (worker/manager)
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```
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### Add label metadata to a node
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Add metadata to a swarm node using node labels. You can specify a node label as
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a key with an empty value:
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``` bash
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$ docker node update --label-add foo worker1
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```
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To add multiple labels to a node, pass the `--label-add` flag for each label:
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``` bash
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$ docker node update --label-add foo --label-add bar worker1
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```
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When you [create a service](service_create.md),
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you can use node labels as a constraint. A constraint limits the nodes where the
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scheduler deploys tasks for a service.
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For example, to add a `type` label to identify nodes where the scheduler should
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deploy message queue service tasks:
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``` bash
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$ docker node update --label-add type=queue worker1
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```
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The labels you set for nodes using `docker node update` apply only to the node
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entity within the swarm. Do not confuse them with the docker daemon labels for
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[dockerd]( ../../userguide/labels-custom-metadata.md#daemon-labels).
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For more information about labels, refer to [apply custom
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metadata](../../userguide/labels-custom-metadata.md).
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## Related information
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* [node inspect](node_inspect.md)
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* [node tasks](node_tasks.md)
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* [node ls](node_ls.md)
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* [node rm](node_rm.md)
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