Revision f3c7b51c UPGRADE

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   upgrading again.
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#. Install the old Ganeti version on all nodes
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   NB: in Ganeti 2.8, the ``cmdlib.py`` file was split into a series of files
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   contained in the ``cmdlib`` directory. If Ganeti is installed from sources
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   and not from a package, while downgrading Ganeti to a pre-2.8
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   version it is important to remember to remove the ``cmdlib`` directory
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   from the directory containing the Ganeti python files (which usually is
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   ``${PREFIX}/lib/python${VERSION}/dist-packages/ganeti``).
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   A simpler upgrade/downgrade procedure will be made available in future
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   versions of Ganeti.
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#. Restart daemons on all nodes::
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    $ /etc/init.d/ganeti restart

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