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added Nathan's explanation of engine vs. node labels 

Signed-off-by: Victoria Bialas <victoria.bialas@docker.com>
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Victoria Bialas 2016-12-02 15:33:23 -08:00
parent 3b1624abd0
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1 changed files with 15 additions and 1 deletions
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engine/swarm/manage-nodes.md
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@ -134,6 +134,20 @@ 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 entity within the swarm. Do not confuse them with the docker daemon labels for
[dockerd](../userguide/labels-custom-metadata.md#daemon-labels). [dockerd](../userguide/labels-custom-metadata.md#daemon-labels).
Therefore, node labels can be used to limit critical tasks to nodes that meet
certain requirements. For example, schedule only on machines where special
workloads should be run, such as machines that meet [PCI-SS
compliance](https://www.pcisecuritystandards.org/).
A compromised worker could not compromise these special workloads because it
cannot change node labels.
Engine labels, however, are still useful because some features that do not
affect secure orchestration of containers might be better off set in a
decentralized manner. For instance, an engine could have a label to indicate
that it has a certain type of disk device, which may not be relevant to security
directly. These labels are more easily "trusted" by the swarm orchestrator.
Refer to the `docker service create` [CLI reference](../reference/commandline/service_create.md) Refer to the `docker service create` [CLI reference](../reference/commandline/service_create.md)
for more information about service constraints. for more information about service constraints.
@ -209,4 +223,4 @@ node-2
* [Swarm administration guide](admin_guide.md) * [Swarm administration guide](admin_guide.md)
* [Docker Engine command line reference](../reference/commandline/index.md) * [Docker Engine command line reference](../reference/commandline/index.md)
* [Swarm mode tutorial](swarm-tutorial/index.md) * [Swarm mode tutorial](swarm-tutorial/index.md)