Error on line 75 in file /system/libraries/Activerecord/drivers/mysql.php

Point of failure:
VC_ActiverecordDriver::connect()

Message:
SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Name or service not known

Trace:
0. VC_Permissions::initialize
1. VC_Plugin::callback
2. VC_Events->fire
3. VC_EventsCallback->execute
4. SystemLink->callbacks
5. User_Groups->get_all
6. VC_ActiverecordDriver->find
7. VC_ActiverecordDriver->connect