Warning: Redis::pconnect(): php_network_getaddresses: getaddrinfo failed: Name or service not known in /export/httpd/medschool/include/REDISCONNECTION.php on line 9

Fatal error: Uncaught RedisException: php_network_getaddresses: getaddrinfo failed: Name or service not known in /export/httpd/medschool/include/REDISCONNECTION.php:9
Stack trace:
#0 /export/httpd/medschool/include/REDISCONNECTION.php(9): Redis->pconnect('medschoolredis....', 6379)
#1 /export/httpd/medschool/include/REDISCONNECTION.php(13): REDISCONNECTION->__construct()
#2 /export/httpd/medschool/include/ipMapping.php(17): REDISCONNECTION::getInstance()
#3 /export/httpd/medschool/model/MEDSCHOOL.php(10): ipMappingByTaobao('54.80.252.84')
#4 /export/httpd/medschool/htdocs/index.php(5): MEDSCHOOL->__construct()
#5 {main}
  thrown in /export/httpd/medschool/include/REDISCONNECTION.php on line 9