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clarified links and services communication in Compose (#4416) 

Signed-off-by: Victoria Bialas <victoria.bialas@docker.com>
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Victoria Bialas 2017-08-29 10:16:47 -07:00 committed by GitHub
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@ -1088,6 +1088,10 @@ a link alias (`SERVICE:ALIAS`), or just the service name.
Containers for the linked service will be reachable at a hostname identical to
the alias, or the service name if no alias was specified.
Links are not required to enable services to communicate - by default,
any service can reach any other service at that service’s name. (See also, the
[Links topic in Networking in Compose](/compose/networking.md#links).)
Links also express dependency between services in the same way as
[depends_on](#dependson), so they determine the order of service startup.