command: docker node update
short: Update a node
long: Update metadata about a node, such as its availability, labels, or roles.
usage: docker node update [OPTIONS] NODE
pname: docker node
plink: docker_node.yaml
options:
- option: availability
  description: Availability of the node ("active"|"pause"|"drain")
- option: label-add
  description: Add or update a node label (key=value)
- option: label-rm
  description: Remove a node label if exists
- option: role
  description: Role of the node ("worker"|"manager")
examples: |-
  ### Add label metadata to a node

  Add metadata to a swarm node using node labels. You can specify a node label as
  a key with an empty value:

  ``` bash
  $ docker node update --label-add foo worker1
  ```

  To add multiple labels to a node, pass the `--label-add` flag for each label:

  ```bash
  $ docker node update --label-add foo --label-add bar worker1
  ```

  When you [create a service](service_create.md),
  you can use node labels as a constraint. A constraint limits the nodes where the
  scheduler deploys tasks for a service.

  For example, to add a `type` label to identify nodes where the scheduler should
  deploy message queue service tasks:

  ``` bash
  $ docker node update --label-add type=queue worker1
  ```

  The labels you set for nodes using `docker node update` apply only to the node
  entity within the swarm. Do not confuse them with the docker daemon labels for
  [dockerd](https://docs.docker.com/engine/userguide/labels-custom-metadata/#daemon-labels).

  For more information about labels, refer to [apply custom
  metadata](https://docs.docker.com/engine/userguide/labels-custom-metadata/).