Posts made by Howard Miller

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Yeh - that discussion is wrong.

On the point of configuring both, it's up to you. I would say that using redis for the Cache is a *very* good idea. Using it for sessions is entirely optional. We have that on our production sites but using different Redis servers (in fact different clusters of Redis servers). However, you're right, it works find pointing both at the same server. IIRC, it's not even required to use a different prefix, although it can't hurt.

The cache configuration is a bit weird in that the config gets written to the file muc/config.php within the 'moodledata' file area. I imagine that you could configure it once and then grab a copy of the file to copy to that location. With the large caveat that I have never tried that.
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These are two entirely different things.

The configuration through the admin UI is to configure Moodle's cache (or MUC as Moodle calls it).

The configuration in config.php is to configure using Redis to store Moodle sessions. Nothing to do with the cache.
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