使用memcached 加快openstack keystone的速度

If you are using PKI for the session tokens for openstack to use then you will find out that it is recommended to use memcache to store these tokens as the MySQL database can bog down if you try to deploy 100 – 300 instances at once.

Modify the /etc/keystone/keystone.conf

################ CODE ##################### [token] # Provides token persistence. # driver = keystone.token.backends.sql.Token #driver = keystone.token.backends.sql.Token driver = keystone.token.backends.memcache.Token ################ CODE #####################   ################ CODE ##################### [cache] enabled = True config_prefix = cache.keystone expiration_time = 300 backend = dogpile.cache.memcached backend_argument = url:localhost:11211 use_key_mangler = True debug_cache_backend = False ################ CODE #####################

 Restart keystone

service openstack-keystone restart

 

Make sure memcache is working ok during a test case to start 50+ instances. Watch the cache hits

watch -d -n 1 ‘memcached-tool 127.0.0.1:11211 stats’