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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 Containers for the linked service will be reachable at a hostname identical to
the alias, or the service name if no alias was specified. 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 Links also express dependency between services in the same way as
[depends_on](#dependson), so they determine the order of service startup. [depends_on](#dependson), so they determine the order of service startup.