volman

I solved the same problem by simply editing the wp-config.php.

Redis options have to go BEFORE the last line which includes wp-settings.php:

define( 'WP_REDIS_SCHEME', 'unix' );
define( 'WP_REDIS_PATH', '/path/to/redis.sock' );

/** Sets up WordPress vars and included files. */
require_once ABSPATH . 'wp-settings.php';