Due to a server crash, I have to restore the whole Alfresco Community (ver 5.2). I am trying to follow the guide in https://community.alfresco.com/thread/202783-backup-and-restore-procedures , but get stuck at recovery of Postgres database, since I cannot login with 'postgres' account (mine PostgreSQL is running on Centos 7). Which is the default password of 'postgres' user? anyone who knows, please help me. I am much appreciated!