docs: correct the placement constraints `docker service` example
- the constraint expression needs to be quoted - add an actual redis container to run so the command line works Signed-off-by: Anil Madhavapeddy <anil@docker.com>
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@ -170,7 +170,8 @@ node type label equals queue:
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```bash
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$ docker service create \
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--name redis_2 \
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--constraint node.labels.type == queue
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--constraint 'node.labels.type == queue' \
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redis:3.0.6
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```
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## Related information
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