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+=====================
+Capabilities
+=====================
+
+- Setting a default locale
+- Setting a instance hostname
+- Generating instance ssh private keys
+- Adding ssh keys to a users ``.ssh/authorized_keys`` so they can log in
+- Setting up ephemeral mount points
+
+User configurability
+--------------------
+
+`Cloud-init`_ 's behavior can be configured via user-data.
+
+ User-data can be given by the user at instance launch time.
+
+This is done via the ``--user-data`` or ``--user-data-file`` argument to ec2-run-instances for example.
+
+* Check your local clients documentation for how to provide a `user-data` string
+ or `user-data` file for usage by cloud-init on instance creation.
+
+
+.. _Cloud-init: https://launchpad.net/cloud-init