Revision d5104ca4 UPGRADE

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way, specifiying the smaller version on the ``--to`` argument.
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2.11
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----
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When upgrading to 2.11, first apply the instructions of ``2.11 and
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above``. 2.11 comes with the new feature of enhanced RPC security
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through client certificates. This features needs to be enabled after the
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upgrade by::
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   $ gnt-cluster renew-crypto --new-node-certificates
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Note that new node certificates are generated automatically without
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warning when upgrading with ``gnt-cluster upgrade``.
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2.1 and above
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-------------
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