Once I install Redis-cache for 2 WordPress sites, they conflicted

You need to use separate databases, or set a WP_CACHE_KEY_SALT.

https://www.ads-software.com/plugins/redis-cache/other_notes/

• This reply was modified 8 years, 5 months ago by Till Krüss.

Thanks for the direction.

Is there any benefit over defining seperate databases vs setting a WP_CACHE_KEY_SALT?

Reason being, its much easier to keep track of setting WP_CACHE_KEY_SALT across a server with close to 50 sites by setting it to the site name, vs tracking numeric numbers per site.

I can only think of security concerns and database size limits. If those two aren’t an issue for you just using the key prefix is fine.

Thanks, this shouldn’t be an issue for us.

So the prefix can be any string, for example if I just set

define('WP_CACHE_KEY_SALT', $_SERVER['HTTP_HOST']); that could work?

Maybe. I’d stick to a-z, 0-9, :, -, , and # characters only: https://redis.io/topics/data-types-intro

• This reply was modified 8 years, 4 months ago by Till Krüss.

Thanks, I’ll probably just filter out non alphanumeric then.