170 lines
6.3 KiB
ReStructuredText
170 lines
6.3 KiB
ReStructuredText
.. _configdrive:
|
|
|
|
Enabling the configuration drive (configdrive)
|
|
==============================================
|
|
|
|
The Bare Metal service supports exposing a configuration drive image to
|
|
the instances.
|
|
|
|
The configuration drive is used to store instance-specific metadata and is present to
|
|
the instance as a disk partition labeled ``config-2``. The configuration drive has
|
|
a maximum size of 64MB. One use case for using the configuration drive is to
|
|
expose a networking configuration when you do not use DHCP to assign IP
|
|
addresses to instances.
|
|
|
|
The configuration drive is usually used in conjunction with the Compute
|
|
service, but the Bare Metal service also offers a standalone way of using it.
|
|
The following sections will describe both methods.
|
|
|
|
|
|
When used with Compute service
|
|
------------------------------
|
|
|
|
To enable the configuration drive for a specific request, pass
|
|
``--config-drive true`` parameter to the :command:`nova boot` command, for example::
|
|
|
|
nova boot --config-drive true --flavor baremetal --image test-image instance-1
|
|
|
|
It's also possible to enable the configuration drive automatically on
|
|
all instances by configuring the ``OpenStack Compute service`` to always
|
|
create a configuration drive by setting the following option in the
|
|
``/etc/nova/nova.conf`` file, for example::
|
|
|
|
[DEFAULT]
|
|
...
|
|
|
|
force_config_drive=True
|
|
|
|
In some cases, you may wish to pass a user customized script when deploying an instance.
|
|
To do this, pass ``--user-data /path/to/file`` to the :command:`nova boot` command.
|
|
|
|
When used standalone
|
|
--------------------
|
|
|
|
When used without the Compute service, the operator needs to create a configuration drive
|
|
and provide the file or HTTP URL to the Bare Metal service.
|
|
|
|
For the format of the configuration drive, Bare Metal service expects a
|
|
``gzipped`` and ``base64`` encoded ISO 9660 [*]_ file with a ``config-2``
|
|
label. The `openstack baremetal client
|
|
<https://docs.openstack.org/python-ironicclient/latest/cli/osc_plugin_cli.html>`_
|
|
can generate a configuration drive in the `expected format`_. Just pass a
|
|
directory path containing the files that will be injected into it via the
|
|
``--config-drive`` parameter of the ``openstack baremetal node deploy``
|
|
command, for example::
|
|
|
|
openstack baremetal node deploy $node_identifier --config-drive /dir/configdrive_files
|
|
|
|
Starting with the Stein release and `ironicclient` 2.7.0, you can request
|
|
building a configdrive on the server side by providing a JSON with keys
|
|
``meta_data``, ``user_data`` and ``network_data`` (all optional), e.g.:
|
|
|
|
.. code-block:: bash
|
|
|
|
openstack baremetal node deploy $node_identifier \
|
|
--config-drive '{"meta_data": {"hostname": "server1.cluster"}}'
|
|
|
|
Configuration drive storage in an object store
|
|
----------------------------------------------
|
|
|
|
Under normal circumstances, the configuration drive can be stored in the
|
|
Bare Metal service when the size is less than 64KB. Optionally, if the size
|
|
is larger than 64KB there is support to store it in a swift endpoint. Both
|
|
swift and radosgw use swift-style APIs.
|
|
|
|
The following option in ``/etc/ironic/ironic.conf`` enables swift as an object
|
|
store backend to store config drive. This uses the Identity service to
|
|
establish a session between the Bare Metal service and the
|
|
Object Storage service. ::
|
|
|
|
[deploy]
|
|
...
|
|
|
|
configdrive_use_object_store = True
|
|
|
|
Use the following options in ``/etc/ironic/ironic.conf`` to enable radosgw.
|
|
Credentials in the swift section are needed because radosgw will not use the
|
|
Identity service and relies on radosgw's username and password authentication
|
|
instead. ::
|
|
|
|
[deploy]
|
|
...
|
|
|
|
configdrive_use_object_store = True
|
|
|
|
[swift]
|
|
...
|
|
|
|
username = USERNAME
|
|
password = PASSWORD
|
|
auth_url = http://RADOSGW_IP:8000/auth/v1
|
|
|
|
If the :ref:`direct-deploy` is being used, edit ``/etc/glance/glance-api.conf``
|
|
to store the instance images in respective object store (radosgw or swift)
|
|
as well::
|
|
|
|
[glance_store]
|
|
...
|
|
|
|
swift_store_user = USERNAME
|
|
swift_store_key = PASSWORD
|
|
swift_store_auth_address = http://RADOSGW_OR_SWIFT_IP:PORT/auth/v1
|
|
|
|
|
|
Accessing the configuration drive data
|
|
--------------------------------------
|
|
|
|
When the configuration drive is enabled, the Bare Metal service will create a partition on the
|
|
instance disk and write the configuration drive image onto it. The
|
|
configuration drive must be mounted before use. This is performed
|
|
automatically by many tools, such as cloud-init and cloudbase-init. To mount
|
|
it manually on a Linux distribution that supports accessing devices by labels,
|
|
simply run the following::
|
|
|
|
mkdir -p /mnt/config
|
|
mount /dev/disk/by-label/config-2 /mnt/config
|
|
|
|
|
|
If the guest OS doesn't support accessing devices by labels, you can use
|
|
other tools such as ``blkid`` to identify which device corresponds to
|
|
the configuration drive and mount it, for example::
|
|
|
|
CONFIG_DEV=$(blkid -t LABEL="config-2" -odevice)
|
|
mkdir -p /mnt/config
|
|
mount $CONFIG_DEV /mnt/config
|
|
|
|
|
|
.. [*] A configuration drive could also be a data block with a VFAT filesystem
|
|
on it instead of ISO 9660. But it's unlikely that it would be needed
|
|
since ISO 9660 is widely supported across operating systems.
|
|
|
|
|
|
Cloud-init integration
|
|
----------------------
|
|
|
|
The configuration drive can be
|
|
especially useful when used with `cloud-init
|
|
<http://cloudinit.readthedocs.io/en/latest/topics/datasources/configdrive.html>`_,
|
|
but in order to use it we should follow some rules:
|
|
|
|
* ``Cloud-init`` data should be organized in the `expected format`_.
|
|
|
|
|
|
* Since the Bare Metal service uses a disk partition as the configuration drive,
|
|
it will only work with
|
|
`cloud-init version >= 0.7.5 <https://github.com/cloud-init/cloud-init/blob/2d6e4219db73e80c135efd83753f9302f778f08d/ChangeLog>`_.
|
|
|
|
|
|
* ``Cloud-init`` has a collection of data source modules, so when
|
|
building the image with `disk-image-builder`_ we have to define
|
|
``DIB_CLOUD_INIT_DATASOURCES`` environment variable and set the
|
|
appropriate sources to enable the configuration drive, for example::
|
|
|
|
DIB_CLOUD_INIT_DATASOURCES="ConfigDrive, OpenStack" disk-image-create -o fedora-cloud-image fedora baremetal
|
|
|
|
For more information see `how to configure cloud-init data sources
|
|
<https://docs.openstack.org/diskimage-builder/latest/elements/cloud-init-datasources/README.html>`_.
|
|
|
|
.. _`expected format`: https://docs.openstack.org/nova/latest/user/vendordata.html
|
|
.. _disk-image-builder: https://docs.openstack.org/diskimage-builder/latest/
|