adelong01

I hope the plugin has continued to work well for you. Please let me know if you have any other problems, or suggestions for improvements.

To further clarify, I made a mistake on my end earlier by suggesting you use “wp quantumcache status“. I was referencing the 1.7 release in my development environment rather than the public release. I still plan to release it tomorrow however.

Thanks again.

Thank you for trying QuantumCache!

Yes, you can configure Redis via wp-config.php, but there are a couple of important prerequisites.

1. Make sure Redis is actually available

On shared hosting, Redis only works if your host provides a Redis service, and
the PHP redis extension is installed (php-redis)

If that extension isn’t available, QuantumCache will automatically fall back to MySQL.

2. Basic wp-config.php setup

You can define your Redis connection like this:

define( ‘QUANTUMCACHE_REDIS_HOST’, ‘127.0.0.1’ );
define( ‘QUANTUMCACHE_REDIS_PORT’, 6379 );
define( ‘QUANTUMCACHE_REDIS_DB’, 0 );

(Optional)

define( ‘QUANTUMCACHE_KEY_PREFIX’, ‘mysite:qc:’ );
define( ‘WP_CACHE_KEY_SALT’, ‘your-unique-salt’ );

If these constants are set, they override anything configured in the plugin UI.

3. Store mode (important)

QuantumCache still uses the store mode setting:

auto (default): tries Redis → falls back to MySQL
redis: forces Redis (will fail if unavailable)
mysql: disables Redis

For most shared hosting setups, leave it on auto.

4. How to verify it’s working Run: wp quantumcache status
   Or check response headers (look for X-QC-Store: redis)

Short version:

1. Yes, wp-config.php works for Redis config
2. Redis must be provided by your host with php-redis enabled
3. Otherwise, QuantumCache will quietly fall back to MySQL