Memcached for Ubuntu ~~~~~~~~~~~~~~~~~~~~ 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. Install and configure components -------------------------------- #. Install the packages: For Ubuntu versions prior to 18.04 use: .. code-block:: console # apt install memcached python-memcache For Ubuntu 18.04 and newer versions use: .. code-block:: console # apt install memcached python3-memcache 2. Edit the ``/etc/memcached.conf`` file and configure the service to use the management IP address of the controller node. This is to enable access by other nodes via the management network: .. code-block:: none -l 10.0.0.11 .. note:: Change the existing line that had ``-l 127.0.0.1``. Finalize installation --------------------- * Restart the Memcached service: .. code-block:: console # service memcached restart