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added note on external volumes with docker stack deploy (#3541) 

Signed-off-by: Victoria Bialas <victoria.bialas@docker.com>
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Victoria Bialas 2017-06-08 17:35:02 -07:00 committed by GitHub
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compose/compose-file/index.md
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@ -1431,6 +1431,18 @@ refer to it within the Compose file:
external:
name: actual-name-of-volume
> External volumes are always created with docker stack deploy
>
External volumes that do not exist _will be created_ if you use [docker stack
deploy](#deploy) to launch the app in [swarm mode](/engine/swarm/index.md)
(instead of [docker compose up](/compose/reference/up.md)). In swarm mode, a
volume is automatically created when it is defined by a service. As service
tasks are scheduled on new nodes,
[swarmkit](https://github.com/docker/swarmkit/blob/master/README.md) creates the
volume on the local node. To learn more, see
[moby/moby#29976](https://github.com/moby/moby/issues/29976).
{: .note-vanilla}
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