The memcache ServiceGroup driver uses memcached, which is a
distributed memory object caching system that is often used to increase site
performance. For more details, see memcached.org.
To use the memcache driver, you must install
memcached. However, because
memcached is often used for both OpenStack Object Storage
and OpenStack dashboard, it might already be installed. If
memcached is not installed, refer to the OpenStack Installation Guide for more
information.
The following values in the /etc/nova/nova.conf file (on every
node) are required for the memcache driver:
# Driver for the ServiceGroup serice servicegroup_driver="mc" # Memcached servers. Use either a list of memcached servers to use for caching (list value), # or "<None>" for in-process caching (default). memcached_servers=<None> # Timeout; maximum time since last check-in for up service (integer value). # Helps to define whether a node is dead service_down_time=60
