Merge "Attach all local disks during rescue"

specs/juno/rescue-attach-all-disks.rst

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+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+====================================
+Attach All Local Disks During Rescue
+====================================
+
+https://blueprints.launchpad.net/nova/+spec/rescue-attach-all-disks
+
+Attach all local disks during rescue to allow users access to all of
+their data.
+
+
+Problem description
+===================
+
+Currently only the root disk of the original instance is attached to the
+rescue instance. If an instance is unbootable, then there is no way to
+salvage data off ephemeral or other local disks.
+
+
+Proposed change
+===============
+
+When an instance is placed into rescue, attach all local disks in addition
+to the root disk already attached.
+
+This explicitly does not attach any non-local disks, such as volumes. Any
+attempt to rescue a volume-backed instance will continue being
+rejected.
+
+
+Alternatives
+------------
+
+None
+
+
+Data model impact
+-----------------
+
+None
+
+
+REST API impact
+---------------
+
+None
+
+
+Security impact
+---------------
+
+None
+
+
+Notifications impact
+--------------------
+
+None
+
+
+Other end user impact
+---------------------
+
+None
+
+
+Performance Impact
+------------------
+
+None
+
+
+Other deployer impact
+---------------------
+
+None
+
+
+Developer impact
+----------------
+
+None
+
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  johannes.erdfelt
+
+Other contributors:
+  None
+
+
+Work Items
+----------
+
+Implement feature for each virt driver.
+
+
+Dependencies
+============
+
+None
+
+
+Testing
+=======
+
+Each virt driver will be expected to test that all disks are attached
+during rescue as part of the existing Nova tests.
+
+Tempest will be updated to assert that the original disks are attached
+during rescue.
+
+
+Documentation Impact
+====================
+
+It should be documented that this is a behavior change when rescuing
+instances.
+
+
+References
+==========
+
+https://bugs.launchpad.net/nova/+bug/1223396