In OpenStack, certain user IDs are reserved and used to run specific OpenStack services and own specific OpenStack files. These users are set up according to the distribution packages. The following table gives an overview.
![[Note]](../common/images/admon/note.png) | Note |
|---|---|
Some OpenStack packages generate and assign user IDs automatically during package installation. In these cases, the user ID value is not important. The existence of the user ID is what matters. |
| Name | Description | ID |
|---|---|---|
| ceilometer | OpenStack Ceilometer Daemons | Assigned during package installation |
| cinder | OpenStack Cinder Daemons | Assigned during package installation |
| glance | OpenStack Glance Daemons | Assigned during package installation |
| heat | OpenStack Heat Daemons | Assigned during package installation |
| keystone | OpenStack Keystone Daemons | Assigned during package installation |
| neutron | OpenStack Neutron Daemons | Assigned during package installation |
| nova | OpenStack Nova Daemons | Assigned during package installation |
| swift | OpenStack Swift Daemons | Assigned during package installation |
| trove | OpenStack Trove Daemons | Assigned during package installation |
Each user belongs to a user group with the same name as the user.
