Setup constants for running local Redis server.

local-redis-setup.php

<?php
/**
 * Plugin Name:     Local Redis Setup
 * Plugin URI:      https://gist.github.com/afragen/f480e5b6560d191139dff7d3d0321615
 * Description:     An mu-plugin to setup Redis server constants.
 * Version:         0.1.0
 * Author:          Andy Fragen
 * License:         MIT
 * Text Domain:     local-redis-setup
 * Gist Plugin URI: https://gist.github.com/afragen/f480e5b6560d191139dff7d3d0321615
 * Requires PHP:    7.4
 * Requires WP:     6.6
 *
 * Must have local Redis server installed and running.
 * @link https://community.localwp.com/t/redis-server-for-local/51120/7?u=afragen
 */

define('WP_REDIS_SELECTIVE_FLUSH', true);
define('WP_REDIS_CLIENT', 'predis');   // Use PHP client, Local does not bundle the native PhpRedis extension.
define('WP_REDIS_HOST', '127.0.0.1');  // Assumes redis-server is running.
define('WP_REDIS_PORT', 6379);         // Default port is fine for us running redis-server.
//define('WP_REDIS_DATABASE', 3);        // Either pick a unique DB per site, 0-15, or…
if ( ! defined('WP_REDIS_PREFIX') ) {
    define('WP_REDIS_PREFIX', sha1( NONCE_KEY ) );  // …alternatively pick a unique prefix per site.
}

/**
 * Add to wp-config.php
 * define( 'WP_CACHE_KEY_SALT', sha1( NONCE_SALT ) );
 */