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The OpenStack metadata server can be configured to serve up vendor data
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which is available to all instances for consumption. OpenStack vendor
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data is, generally, a JSON object.
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cloud-init will look for configuration in the ``cloud-init`` attribute
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of the vendor data JSON object. cloud-init processes this configuration
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using the same handlers as user data, so any formats that work for user
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data should work for vendor data.
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For example, configuring the following as vendor data in OpenStack would
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upgrade packages and install ``htop`` on all instances:
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{"cloud-init": "#cloud-config\npackage_upgrade: True\npackages:\n - htop"}
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For more general information about how cloud-init handles vendor data,
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including how it can be disabled by users on instances, see
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https://bazaar.launchpad.net/~cloud-init-dev/cloud-init/trunk/view/head:/doc/vendordata.txt
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doc/sources/openstack/README.rst
