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-.. _kernel_cmdline:
-
-*******************
-Kernel Command Line
-*******************
-
-In order to allow an ephemeral, or otherwise pristine image to
-receive some configuration, cloud-init will read a url directed by
-the kernel command line and proceed as if its data had previously existed.
-
-This allows for configuring a meta-data service, or some other data.
-
-.. note::
-
-   That usage of the kernel command line is somewhat of a last resort,
-   as it requires knowing in advance the correct command line or modifying
-   the boot loader to append data.
-
-For example, when ``cloud-init init --local`` runs, it will check to
-see if ``cloud-config-url`` appears in key/value fashion
-in the kernel command line as in:
-
-.. code-block:: text
-
-   root=/dev/sda ro cloud-config-url=http://foo.bar.zee/abcde
-
-Cloud-init will then read the contents of the given url.
-If the content starts with ``#cloud-config``, it will store
-that data to the local filesystem in a static filename
-``/etc/cloud/cloud.cfg.d/91_kernel_cmdline_url.cfg``, and consider it as
-part of the config from that point forward.
-
-If that file exists already, it will not be overwritten, and the
-`cloud-config-url` parameter is completely ignored.
-
-Then, when the DataSource runs, it will find that config already available.
-
-So, in order to be able to configure the MAAS DataSource by controlling the
-kernel command line from outside the image, you can append:
-
-  * ``cloud-config-url=http://your.url.here/abcdefg``
-
-Then, have the following content at that url:
-
-.. code-block:: yaml
-
-    #cloud-config
-    datasource:
-      MAAS:
-        metadata_url: http://mass-host.localdomain/source
-        consumer_key: Xh234sdkljf
-        token_key: kjfhgb3n
-        token_secret: 24uysdfx1w4
-
-.. warning::
-
-   `url` kernel command line key is deprecated.
-   Please use `cloud-config-url` parameter instead"
-
-.. note::
-
-   Because ``cloud-config-url=`` is so very generic, in order to avoid false
-   positives,
-   cloud-init requires the content to start with ``#cloud-config`` in order
-   for it to be considered.
-
-.. note::
-
-   The ``cloud-config-url=`` is un-authed http GET, and contains credentials.
-   It could be set up to be randomly generated and also check source
-   address in order to be more secure.