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Add note about pre-create check and exit code 

Signed-off-by: Nathan LeClaire <nathan.leclaire@gmail.com>
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Nathan LeClaire 2016-01-12 11:53:07 -08:00 committed by David Gageot
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@ -224,3 +224,15 @@ Example create:
This will set the swarm scheduling strategy to "binpack" (pack in containers as This will set the swarm scheduling strategy to "binpack" (pack in containers as
tightly as possible per host instead of spreading them out), and the "heartbeat" tightly as possible per host instead of spreading them out), and the "heartbeat"
interval to 5 seconds. interval to 5 seconds.
## Pre-create check
Since many drivers require a certain set of conditions to be in place before
they can successfully perform a create (e.g. VirtualBox should be installed, or
the provided API credentials should be valid), Docker Machine has a "pre-create
check" which is specified at the driver level.
If this pre-create check succeeds, Docker Machine will proceed with the creation
as normal. If the pre-create check fails, the Docker Machine process will exit
with status code 3 to indicate that the source of the non-zero exit was the
pre-create check failing.