openstack/ironic
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Merge "[doc] Describe how to extract an fs UUID from an image"

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Zuul 2020-07-08 21:59:24 +00:00 committed by Gerrit Code Review
commit a92c536473
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doc/source/admin/raid.rst
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@ -410,7 +410,17 @@ have its root file system on the first partition. Starting with Ussuri,
the image can also have additional metadata to point Ironic to the
partition with the root file system: for this, the image needs to set
the ``rootfs_uuid`` property with the file system UUID of the root file
system. The pre-Ussuri approach, i.e. to have the root file system on
system. One way to extract this UUID from an existing image is to
download the image, mount it as a loopback device, and use ``blkid``:
.. code-block:: bash
$ sudo losetup -f
$ sudo losetup /dev/loop0 /tmp/myimage.raw
$ sudo kpartx -a /dev/loop0
$ blkid
The pre-Ussuri approach, i.e. to have the root file system on
the first partition, is kept as a fallback and hence allows software
RAID deployments where Ironic does not have access to any image metadata
(e.g. Ironic stand-alone).