http://docs.ansible.com/intro_patterns.html shows
webservers:dbservers:&staging:!phoenix
as an example of a combination of unions and intersections, and says that
this means
all machines in the groups `webservers' and `dbservers' are to be
managed if they are in the group `staging' also, but the machines are
not to be managed if they are in the group `phoenix'
To simplify slightly, because I don't actualy need the negation in my
example, it's saying that
webservers:dbservers:&staging
means
(websevers UNION dbservers) INTERSECTION staging
which is cool.
But, I have a use case where I want to say
webservers UNION (dbservers INTERSECTION staging)
i.e. I want to manage with all webservers and only staging dbservers. I
didn't see an obvious way to do that; all three of
webservers:dbservers:&staging
webservers:staging:&dbservers
dbservers:&staging:webservers
staging:&dbservers:webservers
seem to be equivalent, and adding parentheses didn't seem to be supported
(I got "ERROR: provided hosts list is empty").
I particularly want to use it in a --limit argument, if that matters.
Is there a way to do this, or does union always take precedence over
intersection?
-Josh ([email protected])
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