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Since we are using a nested web root, the config directory can be in the root code directory, and not in the pantheon default of sites/default/config. Add the following to settings.php.

/**
 * Use config sync directory in the code root.
 */
if (isset($_ENV['PANTHEON_ENVIRONMENT'])) {
  $config_directories = array(
    CONFIG_SYNC_DIRECTORY => $_SERVER['HOME'] .'/code/config/default',
  );
}

APC, redis, and solr

The pantheon_advanced_page_cache module should be installed. There is no configuration, it just starts working when enabled.

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