Why are hosts embedded in a play?

[Todd Sampson]

I'm a newcomer but there's one thing that bothers me.  It seems that plays always have the hosts to be acted on embedded in the play itself.  What if you wanted to run a play against different hosts?  For example, you might want to run the play against your test setup.  If all goes well, you might want to run it against your East servers and then to West and then...

[Matt Martz]

We don't put out dev/test/staging/prod servers all in one inventory file.  We have separate inventories for each individual "environment".

Additionally, we would target something like:

hosts: web

And then if we wanted to only target our web servers in "east", we would use --limit, such as:

ansible-playbook -i production --limit east some-playbook.yml

or even:

ansible-playbook -i production --limit web:&east some-playbook.yml

-- 
Matt Martz
ma...@sivel.net

On May 7, 2014 at 9:11:36 AM, Todd Sampson (samps...@gmail.com) wrote:

I'm a newcomer but there's one thing that bothers me.  It seems that plays always have the hosts to be acted on embedded in the play itself.  What if you wanted to run a play against different hosts?  For example, you might want to run the play against your test setup.  If all goes well, you might want to run it against your East servers and then to West and then...

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[Brian Coca]

there are many ways around this, Matt demonstrated one (I happen to use the same). You can also have a unified inventory file and used --limit against that (--limit 'production'). 

Another popular method is by making the hosts entry parameterized:

hosts: "web:{{target}}"

now you can pass -e 'target=&production'  in the command line or any other combination that is allowed by host patterns

--
Brian Coca
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