Setup redis page cache for magento2

env.php

    'cache' => array (
        'frontend' => array (
            'default' => array (
                'backend'         => 'Cm_Cache_Backend_Redis',
                'backend_options' => array (
                    'server' => '127.0.0.1',
                    'port'   => '6379',
                ),
            ),
            // Start of snippet
            'page_cache' => array (
                'backend'         => 'Cm_Cache_Backend_Redis',
                'backend_options' => array (
                    'server'        => '127.0.0.1',
                    'port'          => '6379',
                    'database'      => '1',
                    'compress_data' => '0',
                ),
            ),
            // End of snippet
        ),
    ),

Add missing array(
Indent and comma like default
page_cache should be a child of frontend
http://devdocs.magento.com/guides/v2.1/config-guide/redis/redis-pg-cache.html

  'cache' => 
  array (
    'frontend' => 
    array (
      'default' =>
      array (
        'backend' => 'Cm_Cache_Backend_Redis',
        'backend_options' =>
        array (
          'server' => '127.0.0.1',
          'port' => '6379',
        ),
      ),
      // Start of snippet
      'page_cache' => 
      array (
        'backend' => 'Cm_Cache_Backend_Redis',
        'backend_options' => 
        array (
          'server' => '127.0.0.1',
          'port' => '6379',
          'database' => '1',
          'compress_data' => '0',
        ),
      ),
      // End of snippet
    ),
  ),

or with 4 spaces:

    'cache' => array (
        'frontend' => array (
            'default' => array (
                'backend' => 'Cm_Cache_Backend_Redis',
                'backend_options' => array (
                    'server' => '127.0.0.1',
                    'port' => '6379',
                ),
            ),
            // Start of snippet
            'page_cache' => array (
                'backend' => 'Cm_Cache_Backend_Redis',
                'backend_options' => array (
                    'server' => '127.0.0.1',
                    'port' => '6379',
                    'database' => '1',
                    'compress_data' => '0',
                ),
            ),
            // End of snippet
        ),
    ),