Additional configuration options for the Pantheon platform. Append this gist to your project's settings.php and modify as needed.

settings.php

<?php
/**
 * @file
 * Drupal site-specific configuration file.
 */

/**
 * Redirect to a common domain.
 */
if (isset($_SERVER['PANTHEON_ENVIRONMENT']) && ($_SERVER['PANTHEON_ENVIRONMENT'] == 'live')) {
  if ($_SERVER['HTTP_HOST'] == 'example.com' ||
      $_SERVER['HTTP_HOST'] == 'live-example.gotpantheon.com') {
    header('HTTP/1.0 301 Moved Permanently');
    header('Location: http://www.example.com'. $_SERVER['REQUEST_URI']);
    exit();
  }
}

/**
 * Platform specific settings.
 *
 * @see http://helpdesk.getpantheon.com/customer/portal/articles/708588
 */
if (defined('PANTHEON_ENVIRONMENT')) {
  // Performance settings.
  // Production environment configuration.
  if (PANTHEON_ENVIRONMENT == 'live') {
    // Anonymous caching - enabled.
    $conf['cache'] = 1;
    // Block caching - enabled.
    $conf['block_cache'] = 1;
    // Expiration of cached pages - 15 minutes.
    $conf['page_cache_maximum_age'] = 900;
    // Aggregate and compress CSS files in Drupal - on.
    $conf['preprocess_css'] = 1;
    // Aggregate JavaScript files in Drupal - on.
    $conf['preprocess_js'] = 1;
    // minify HTML.
    $conf['minify_html'] = 1;
    // Use Minified JavaScript files.
    $conf['minify_js'] = 1;
  }
  // Development environment configuration.
  else {
    // Anonymous caching.
    $conf['cache'] = 0;
    // Block caching - disabled.
    $conf['block_cache'] = 0;
    // Expiration of cached pages - none.
    $conf['page_cache_maximum_age'] = 0;
    // Aggregate and compress CSS files in Drupal - off.
    $conf['preprocess_css'] = 0;
    // Aggregate JavaScript files in Drupal - off.
    $conf['preprocess_js'] = 0;
    // minify HTML.
    $conf['minify_html'] = 0;
    // Use Minified JavaScript files.
    $conf['minify_js'] = 0;
  }

  // Minimum cache lifetime - always none.
  $conf['cache_lifetime'] = 0;
  // Cached page compression - always off.
  $conf['page_compression'] = 0;

  # // Other settings.
  # if (PANTHEON_ENVIRONMENT == 'dev') {
  #   // Google Analytics.
  #   $conf['googleanalytics_account'] = 'UA-XXXXXXXX-X';
  # }
  # else if (PANTHEON_ENVIRONMENT == 'test') {
  #   // Google Analytics.
  #   $conf['googleanalytics_account'] = 'UA-XXXXXXXX-Y';
  # }
  # else if (PANTHEON_ENVIRONMENT == 'live') {
  #   // Google Analytics.
  #   $conf['googleanalytics_account'] = 'UA-XXXXXXXX-Z';
  # }
}
else {
  // Database configuration for local development.
  $databases['default']['default'] = array(
    'database' => 'DATABASE',
    'username' => 'USERNAME',
    'password' => 'PASSWORD',
    'host' => 'localhost',
    'driver' => 'mysql',
    'port' => 3306,
    'prefix' => '',
  );
}

/**
 * Redis cache settings for Pantheon.
 *
 * @see http://helpdesk.getpantheon.com/customer/portal/articles/401317-understanding-redis-cache
 */
# if (defined('PANTHEON_ENVIRONMENT')) {
#   // Following is required for all Pantheon environments using Redis.
#   $conf['redis_client_interface'] = 'PhpRedis';
#   $conf['lock_inc']               = 'sites/all/modules/contrib/redis/redis.lock.inc';
#   $conf['path_inc']               = 'sites/all/modules/contrib/redis/redis.path.inc';
#   $conf['cache_backends'][]       = 'sites/all/modules/contrib/redis/redis.autoload.inc';
#   $conf['cache_default_class']    = 'Redis_Cache';
#   $conf['cache_prefix']           = array('default' => 'pantheon-redis-' . $_SERVER['PANTHEON_ENVIRONMENT']);
#   // Do not use Redis for cache_form (no performance difference).
#   $conf['cache_class_cache_form'] = 'DrupalDatabaseCache';
#
#   // Following settings are optional. DO NOT USE BOTH AT THE SAME TIME.
#   //
#   // Option A:
#   // =========
#   // Higher performance for smaller page counts. This technique does not execute
#   // full Drupal bootstrapping and does not invoke the database, which ignores
#   // database checks such as Drupal's IP blacklist.
#   //
#   // High performance - no hook_boot(), no hook_exit(), ignores Drupal IP blacklists.
#   # $conf['page_cache_without_database'] = TRUE;
#   # $conf['page_cache_invoke_hooks'] = FALSE;
#   // Explicitly set page_cache_maximum_age as database won't be available.
#   # $conf['page_cache_maximum_age'] = 900;
#   //
#   // Option B:
#   // =========
#   // Higher hit rate for larger page counts. This technique avoids evictions due
#   // to redis space limitations when your site has a large quantity of pages to
#   // cache. Will conflict with Option A which skips the database entirely.
#   //
#   // Use the database for cached HTML.
#   $conf['cache_class_cache_page'] = 'DrupalDatabaseCache';
# }