Jon A.:
> Since memcache use is relatively new, I've found fewer examples of
> implementation. I've read the postfix man and doc pages, and searched the
> mailing list and looked at others configurations on the web to compile this
> email -- partially to answer some questions/correct my mistakes, and
> partially because it may be helpful for somebody else to see what I've
> found.
>
> It appears that memcache may only be used for dynamic content (write) for
> - postscreen whitelist cache
> - address verification cache
> - TLS session key cache
You can use a Postfix memcache table for all Postfix tables (read-only
or read-write) except where Postfix documentation says otherwise
(primarily, you can't use it for security-sensitive information).
A Postfix memcache table implements a volatile cache. If you configure
it with a "backup" database, then all information in the cache is
a copy of information in the backup database.
And of course you can't use memcached in read-write mode when the
backup database is read-only. That would violate cache consistency.
Wietse
