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Markus Amalthea Magnuson 2014-03-04 20:57:12 +01:00
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docsite/rst/intro_dynamic_inventory.rst
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@ -10,7 +10,7 @@ in a different software system. Ansible provides a basic text-based system as d
:doc:`intro_inventory` but what if you want to use something else?
Frequent examples include pulling inventory from a cloud provider, LDAP, `Cobbler <http://cobbler.github.com>`_,
or a piece of expensive enterprisey CMDB software.
or a piece of expensive enterprisey CMDB software.
Ansible easily supports all of these options via an external inventory system. The plugins directory contains some of these already -- including options for EC2/Eucalyptus, Rackspace Cloud, and OpenStack, examples of some of which will be detailed below.
@ -73,7 +73,7 @@ And technically, though there is no major good reason to do it, this also works
ansible webserver -m shell -a "echo {{ a }}"
So in other words, you can use those variables in arguments/actions as well.
So in other words, you can use those variables in arguments/actions as well.
.. _aws_example:
@ -103,7 +103,7 @@ After a few moments, you should see your entire EC2 inventory across all regions
Since each region requires its own API call, if you are only using a small set of regions, feel free to edit ``ec2.ini`` and list only the regions you are interested in. There are other config options in ``ec2.ini`` including cache control, and destination variables.
At their heart, inventory files are simply a mapping from some name to a destination address. The default ``ec2.ini`` settings are configured for running Ansible from outside EC2 (from your laptop for example) -- and this is not the most efficient way to manage EC2.
At their heart, inventory files are simply a mapping from some name to a destination address. The default ``ec2.ini`` settings are configured for running Ansible from outside EC2 (from your laptop for example) -- and this is not the most efficient way to manage EC2.
If you are running Ansible from within EC2, internal DNS names and IP addresses may make more sense than public DNS names. In this case, you can modify the ``destination_variable`` in ``ec2.ini`` to be the private DNS name of an instance. This is particularly important when running Ansible within a private subnet inside a VPC, where the only way to access an instance is via its private IP address. For VPC instances, `vpc_destination_variable` in ``ec2.ini`` provides a means of using which ever `boto.ec2.instance variable <http://docs.pythonboto.org/en/latest/ref/ec2.html#module-boto.ec2.instance>`_ makes the most sense for your use case.