memcache_servers parameter format for IPv6 address/hostname

Issue

Memcache ia an open source, high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load.

The Identity service authentication mechanism for services uses Memcached to cache tokens.

In order to setup a memcached based backend we need to pass the memcache_servers parameter to oslo.config. memcache_servers accepts different formats for IPv6 address/hostname but not all of them end in a correct configuration of the memcached backend.

Related articles:

• Keystone. Configuring cache for fernet tokens