How to install or access Redis extension in CE V1.9x under Windows Azure Web App (IIS environment)

[dkpruett]

I have a Redis server already created on Microsoft Azure, and I'm trying to configure the Windows-based Azure Web App with the Redis server; I'm not sure how to install or access one of the 2 extensions I've come across.

As I've read, Redis was available as a pre-installed extension in CE 1.8 as Mage_Cache_Backend_Redis, however apparently that is not installed in CE v1.9?

I'm using CE 1.9.2.2; when I change the local.xml file in my Web App to <backend>Mage_Cache_Backend_Redis</backend> I receive an error:

looking at the log in var/report/1486484366 shows:

• a:4:{i:0;s:151:"Connection to Redis failed after 2 failures.Last Error : (10013) An attempt was made to access a socket in a way forbidden by its access permissions.
  ";i:1;s:1389:"#0 D:\home\site\wwwroot\lib\Credis\Client.php(439): Credis_Client->connect()
  #1 D:\home\site\wwwroot\lib\Credis\Client.php(725): Credis_Client->connect()
  #2 D:\home\site\wwwroot\lib\Credis\Client.php(599): Credis_Client->__call('select', Array)
  #3 D:\home\site\wwwroot\lib\Cm\Cache\Backend\Redis.php(135): Credis_Client->select(0)
  #4 D:\home\site\wwwroot\lib\Zend\Cache.php(153): Cm_Cache_Backend_Redis->__construct(Array)
  #5 D:\home\site\wwwroot\lib\Zend\Cache.php(94): Zend_Cache::_makeBackend('Mage_Cache_Back...', Array, true, true)
  #6 D:\home\site\wwwroot\app\code\core\Mage\Core\Model\Cache.php(137): Zend_Cache::factory('Varien_Cache_Co...', 'Mage_Cache_Back...', Array, Array, true, true, true)
  #7 D:\home\site\wwwroot\app\code\core\Mage\Core\Model\Config.php(1348): Mage_Core_Model_Cache->__construct(Array)
  #8 D:\home\site\wwwroot\app\Mage.php(463): Mage_Core_Model_Config->getModelInstance('core/cache', Array)
  #9 D:\home\site\wwwroot\app\code\core\Mage\Core\Model\App.php(412): Mage::getModel('core/cache', Array)
  #10 D:\home\site\wwwroot\app\code\core\Mage\Core\Model\App.php(306): Mage_Core_Model_App->_initCache(Array)
  #11 D:\home\site\wwwroot\app\code\core\Mage\Core\Model\App.php(348): Mage_Core_Model_App->baseInit(Array)
  #12 D:\home\site\wwwroot\app\Mage.php(684): Mage_Core_Model_App->run(Array)
  #13 D:\home\site\wwwroot\index.php(83): Mage::run('', 'store')
  #14 {main}";s:3:"url";s:69:"/index.php/admin/cache/flushAll/key/1976144c15f51ec7fa284d6addb657e0/";s:11:"script_name";s:10:"/index.php";}

I've created a REDIS_HOST, REDIS_KEY, and MEMCACHESHIM_REDIS_ENABLE in the App Settings for my Web App as identified under article https://azure.microsoft.com/en-us/documentation/articles/web-sites-connect-to-redis-using-memcache-p... though I understand this article may not be completely relevant but it's the closest I've seen to help with my issue.

Any help would be appreciated.

[Brent W Peterson]

You can update your local.xml with the following for your backend cache

<config>
    <global>
 
        <!-- other configuration nodes -->
 
        <cache>
          <backend>CACHE_BACKEND_CLASS_NAME</backend>
          <backend_options>
            <server>127.0.0.1</server>              <!-- or absolute path to unix socket -->
            <port>6379</port>
            <persistent></persistent>               <!-- Specify a unique string like "cache-db0" to enable persistent connections. -->
            <database>0</database>
            <password></password>
            <force_standalone>0</force_standalone>  <!-- 0 for phpredis, 1 for standalone PHP -->
            <connect_retries>1</connect_retries>    <!-- Reduces errors due to random connection failures -->
            <read_timeout>10</read_timeout>         <!-- Set read timeout duration -->
            <automatic_cleaning_factor>0</automatic_cleaning_factor> <!-- Disabled by default -->
            <compress_data>1</compress_data>        <!-- 0-9 for compression level, recommended: 0 or 1 -->
            <compress_tags>1</compress_tags>        <!-- 0-9 for compression level, recommended: 0 or 1 -->
            <compress_threshold>20480</compress_threshold>  <!-- Strings below this size will not be compressed -->
            <compression_lib>gzip</compression_lib> <!-- Supports gzip, lzf and snappy -->
          </backend_options>
        </cache>
 
        <!-- other configuration nodes -->
 
    </global>
</config>

[dkpruett]

Brent: Thanks for the help; I've tried that and my current local.xml is below. I've tried with:

<backend>Mage_Cache_Backend_Redis</backend>

and the local IP <server>127.0.0.1</server>

I just don't see that my Azure site is talking to the Azure Redis server, located at mywebsite.redis.cache.windows.net. The closest documentation I've found is how to connect a site running Memcache at https://azure.microsoft.com/en-us/documentation/articles/web-sites-connect-to-redis-using-memcache-p.../.

local.xml:

<cache> 
  <backend>Cm_RedisSession</backend>
  <backend_options>
   <server>hostnameremoved.redis.cache.windows.net</server> <!-- or absolute path to unix socket -->
   <port>6379</port>
   <persistent></persistent>                                <!-- Specify unique string to enable persistent connections. E.g.: sess-db0; bugs with phpredis and php-fpm are known: https://github.com/nicolasff/phpredis/issues/70 -->
   <database>0</database>                                   <!-- Redis database number; protection against accidental data loss is improved by not sharing databases -->
   <password></password>                                    <!-- Specify if your Redis server requires authentication -->
   <force_standalone>0</force_standalone>                   <!-- 0 for phpredis, 1 for standalone PHP -->
   <connect_retries>1</connect_retries>                     <!-- Reduces errors due to random connection failures; a value of 1 will not retry after the first failure -->
   <read_timeout>10</read_timeout>                          <!-- Set read timeout duration; phpredis does not currently support setting read timeouts -->
   <automatic_cleaning_factor>0</automatic_cleaning_factor> <!-- Disabled by default -->
   <compress_data>1</compress_data>                         <!-- 0-9 for compression level, recommended: 0 or 1 -->
   <compress_tags>1</compress_tags>                         <!-- 0-9 for compression level, recommended: 0 or 1 -->
   <compress_threshold>20480</compress_threshold>           <!-- Strings below this size will not be compressed -->
   <compression_lib>gzip</compression_lib>                  <!-- Support gzip, lzf, lz4 (https://github.com/kjdev/php-ext-lz4) or snappy (https://github.com/goatherd/php-snappy) -->
   <use_lua>0</use_lua>                                     <!-- Set to 1 if Lua scripts should be used for some operations -->
 </backend_options>
 </cache>