Fatal error: Uncaught CredisException: Lost connection to Redis server. in /var/www/magento2/htdocs/vendor/colinmollenhour/credis/Client.php:1285 Stack trace: #0 /var/www/magento2/htdocs/vendor/colinmollenhour/credis/Client.php(1034): Credis_Client->read_reply('select') #1 /var/www/magento2/htdocs/vendor/colinmollenhour/credis/Client.php(655): Credis_Client->__call('select', Array) #2 /var/www/magento2/htdocs/vendor/colinmollenhour/cache-backend-redis/Cm/Cache/Backend/Redis.php(415): Credis_Client->select(74) #3 /var/www/magento2/htdocs/vendor/colinmollenhour/cache-backend-redis/Cm/Cache/Backend/Redis.php(250): Cm_Cache_Backend_Redis->_applyClientOptions(Object(Credis_Client)) #4 /var/www/magento2/htdocs/vendor/magento/framework/Cache/Backend/Redis.php(34): Cm_Cache_Backend_Redis->__construct(Array) #5 /var/www/magento2/htdocs/vendor/magento/zendframework1/library/Zend/Cache.php(153): Magento\Framework\Cache\Backend\Redis->__construct(Array) #6 /var/www/magento2/htdocs/vendor/magento/zendframework1/library/Zend/Cache.php( in /var/www/magento2/htdocs/vendor/colinmollenhour/credis/Client.php on line 1285