Reserved user IDs 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. 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.
Reserved user IDs
Name Description ID
ceilometer openstack-ceilometer OpenStack Ceilometer Daemons 166 Assigned during package installation
cinder openstack-cinder OpenStack Cinder Daemons 165 Assigned during package installation
glance openstack-glance OpenStack Glance Daemons 161 Assigned during package installation
heat openstack-heat OpenStack Heat Daemons 187 Assigned during package installation
keystone openstack-keystone OpenStack Keystone Daemons 163 Assigned during package installation
neutron openstack-neutron OpenStack Neutron Daemons 164 Assigned during package installation
nova openstack-nova OpenStack Nova Daemons 162 96 Assigned during package installation
swift openstack-swift OpenStack Swift Daemons 160 Assigned during package installation
Each user belongs to a user group with the same name as the user.