There are three main user accounts in vCloud Usage Meter.

When you deploy the vCloud Usage Meter appliance, you must configure the passwords for the root, usagemeter, and umauditor user accounts in the Deploy OVF Template wizard. The user account passwords for the vCloud Usage Meter 4.2 appliance do not expire.

User Account Permissions
root The root user can access the vCloud Usage Meter log and configuration files, and manage the services running in the vCloud Usage Meter appliance.
usagemeter The usagemeter user can log in to the vCloud Usage Meter web interface, manage the services running in the vCloud Usage Meter appliance, and view the log files.
umauditor The umauditor user can only for view the vCloud Usage Meter log and configuration files.