openstack-manuals/doc/install-guide/source/environment-memcached.rst

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Memcached
~~~~~~~~~
The Identity service authentication mechanism for services uses Memcached
to cache tokens. The memcached service typically runs on the controller
node. For production deployments, we recommend enabling a combination of
firewalling, authentication, and encryption to secure it.
.. toctree::
:glob:
environment-memcached-*