8.4.3. cache
The following table outlines the options available under the [cache]
group in the /etc/neutron/metadata_agent.ini
file.
Configuration option = Default value | Type | Description |
---|---|---|
| string value | Cache backend module. For eventlet-based or environments with hundreds of threaded servers, Memcache with pooling (oslo_cache.memcache_pool) is recommended. For environments with less than 100 threaded servers, Memcached (dogpile.cache.memcached) or Redis (dogpile.cache.redis) is recommended. Test environments with a single instance of the server can use the dogpile.cache.memory backend. |
| multi valued | Arguments supplied to the backend module. Specify this option once per argument to be passed to the dogpile.cache backend. Example format: "<argname>:<value>". |
| string value | Prefix for building the configuration dictionary for the cache region. This should not need to be changed unless there is another dogpile.cache region with the same configuration name. |
| boolean value | Extra debugging from the cache backend (cache keys, get/set/delete/etc calls). This is only really useful if you need to see the specific cache-backend get/set/delete calls with the keys/values. Typically this should be left set to false. |
| boolean value | Global toggle for caching. |
| integer value | Default TTL, in seconds, for any cached item in the dogpile.cache region. This applies to any cached method that doesn’t have an explicit cache expiration time defined for it. |
| integer value | Number of seconds memcached server is considered dead before it is tried again. (dogpile.cache.memcache and oslo_cache.memcache_pool backends only). |
| integer value | Number of seconds that an operation will wait to get a memcache client connection. |
| integer value | Max total number of open connections to every memcached server. (oslo_cache.memcache_pool backend only). |
| integer value | Number of seconds a connection to memcached is held unused in the pool before it is closed. (oslo_cache.memcache_pool backend only). |
| list value | Memcache servers in the format of "host:port". (dogpile.cache.memcache and oslo_cache.memcache_pool backends only). |
| floating point value | Timeout in seconds for every call to a server. (dogpile.cache.memcache and oslo_cache.memcache_pool backends only). |
| list value | Proxy classes to import that will affect the way the dogpile.cache backend functions. See the dogpile.cache documentation on changing-backend-behavior. |