Document memcached host system time configuration.
* Addresses 1022614 Change-Id: I81617c4eecd6fdfdb3f01eb674f7308d9c93baaa
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@ -45,6 +45,18 @@ Stop the process using ``Control-C``.
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If you have not already configured Keystone, it may not start as expected.
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Memcached and System Time
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=========================
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If using `memcached`_ with Keystone - e.g. using the memcache token
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driver or the ``auth_token`` middleware - ensure that the system time
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of memcached hosts is set to UTC. Memcached uses the host's system
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time in determining whether a key has expired, whereas Keystone sets
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key expiry in UTC. The timezone used by Keystone and memcached must
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match if key expiry is to behave as expected.
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.. _`memcached`: http://memcached.org/
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Configuration Files
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===================
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