The main components of Identity user management are: Users Tenants Roles A user represents a human user, and has associated information such as user name, password, and email. This example creates a user named "alice": $ keystone user-create --name=alice \ --pass=mypassword123 --email=alice@example.com A tenant can be a project, group, or organization. Whenever you make requests to OpenStack services, you must specify a tenant. For example, if you query the Compute service for a list of running instances, you receive a list of all of the running instances in the tenant that you specified in your query. This example creates a tenant named "acme": $ keystone tenant-create --name=acme Because the term project was used instead of tenant in earlier versions of OpenStack Compute, some command-line tools use --project_id instead of --tenant-id or --os-tenant-id to refer to a tenant ID. A role captures what operations a user is permitted to perform in a given tenant. This example creates a role named "compute-user": $ keystone role-create --name=compute-user It is up to individual services such as the Compute service and Image service to assign meaning to these roles. As far as the Identity service is concerned, a role is simply a name. The Identity service associates a user with a tenant and a role. To continue with the previous examples, you might to assign the "alice" user the "compute-user" role in the "acme" tenant: $ keystone user-list +--------+---------+-------------------+--------+ | id | enabled | email | name | +--------+---------+-------------------+--------+ | 892585 | True | alice@example.com | alice | +--------+---------+-------------------+--------+ $ keystone role-list +--------+--------------+ | id | name | +--------+--------------+ | 9a764e | compute-user | +--------+--------------+ $ keystone tenant-list +--------+------+---------+ | id | name | enabled | +--------+------+---------+ | 6b8fd2 | acme | True | +--------+------+---------+ $ keystone user-role-add --user=892585 --role=9a764e --tenant-id=6b8fd2 A user can be assigned different roles in different tenants: for example, Alice might also have the "admin" role in the "Cyberdyne" tenant. A user can also be assigned multiple roles in the same tenant. The /etc/[SERVICE_CODENAME]/policy.json file controls the tasks that users can perform for a given service. For example, /etc/nova/policy.json specifies the access policy for the Compute service, /etc/glance/policy.json specifies the access policy for the Image service, and /etc/keystone/policy.json specifies the access policy for the Identity service. The default policy.json files in the Compute, Identity, and Image service recognize only the admin role: all operations that do not require the admin role are accessible by any user that has any role in a tenant. If you wish to restrict users from performing operations in, say, the Compute service, you need to create a role in the Identity service and then modify /etc/nova/policy.json so that this role is required for Compute operations. For example, this line in /etc/nova/policy.json specifies that there are no restrictions on which users can create volumes: if the user has any role in a tenant, they can create volumes in that tenant. "volume:create": [], To restrict creation of volumes to users who had the compute-user role in a particular tenant, you would add "role:compute-user", like so: "volume:create": ["role:compute-user"], To restrict all Compute service requests to require this role, the resulting file would look like: { "admin_or_owner": [["role:admin"], ["project_id:%(project_id)s"]], "default": [["rule:admin_or_owner"]], "compute:create": ["role":"compute-user"], "compute:create:attach_network": ["role":"compute-user"], "compute:create:attach_volume": ["role":"compute-user"], "compute:get_all": ["role":"compute-user"], "admin_api": [["role:admin"]], "compute_extension:accounts": [["rule:admin_api"]], "compute_extension:admin_actions": [["rule:admin_api"]], "compute_extension:admin_actions:pause": [["rule:admin_or_owner"]], "compute_extension:admin_actions:unpause": [["rule:admin_or_owner"]], "compute_extension:admin_actions:suspend": [["rule:admin_or_owner"]], "compute_extension:admin_actions:resume": [["rule:admin_or_owner"]], "compute_extension:admin_actions:lock": [["rule:admin_api"]], "compute_extension:admin_actions:unlock": [["rule:admin_api"]], "compute_extension:admin_actions:resetNetwork": [["rule:admin_api"]], "compute_extension:admin_actions:injectNetworkInfo": [["rule:admin_api"]], "compute_extension:admin_actions:createBackup": [["rule:admin_or_owner"]], "compute_extension:admin_actions:migrateLive": [["rule:admin_api"]], "compute_extension:admin_actions:migrate": [["rule:admin_api"]], "compute_extension:aggregates": [["rule:admin_api"]], "compute_extension:certificates": ["role":"compute-user"], "compute_extension:cloudpipe": [["rule:admin_api"]], "compute_extension:console_output": ["role":"compute-user"], "compute_extension:consoles": ["role":"compute-user"], "compute_extension:createserverext": ["role":"compute-user"], "compute_extension:deferred_delete": ["role":"compute-user"], "compute_extension:disk_config": ["role":"compute-user"], "compute_extension:evacuate": [["rule:admin_api"]], "compute_extension:extended_server_attributes": [["rule:admin_api"]], "compute_extension:extended_status": ["role":"compute-user"], "compute_extension:flavorextradata": ["role":"compute-user"], "compute_extension:flavorextraspecs": ["role":"compute-user"], "compute_extension:flavormanage": [["rule:admin_api"]], "compute_extension:floating_ip_dns": ["role":"compute-user"], "compute_extension:floating_ip_pools": ["role":"compute-user"], "compute_extension:floating_ips": ["role":"compute-user"], "compute_extension:hosts": [["rule:admin_api"]], "compute_extension:keypairs": ["role":"compute-user"], "compute_extension:multinic": ["role":"compute-user"], "compute_extension:networks": [["rule:admin_api"]], "compute_extension:quotas": ["role":"compute-user"], "compute_extension:rescue": ["role":"compute-user"], "compute_extension:security_groups": ["role":"compute-user"], "compute_extension:server_action_list": [["rule:admin_api"]], "compute_extension:server_diagnostics": [["rule:admin_api"]], "compute_extension:simple_tenant_usage:show": [["rule:admin_or_owner"]], "compute_extension:simple_tenant_usage:list": [["rule:admin_api"]], "compute_extension:users": [["rule:admin_api"]], "compute_extension:virtual_interfaces": ["role":"compute-user"], "compute_extension:virtual_storage_arrays": ["role":"compute-user"], "compute_extension:volumes": ["role":"compute-user"], "compute_extension:volume_attachments:index": ["role":"compute-user"], "compute_extension:volume_attachments:show": ["role":"compute-user"], "compute_extension:volume_attachments:create": ["role":"compute-user"], "compute_extension:volume_attachments:delete": ["role":"compute-user"], "compute_extension:volumetypes": ["role":"compute-user"], "volume:create": ["role":"compute-user"], "volume:get_all": ["role":"compute-user"], "volume:get_volume_metadata": ["role":"compute-user"], "volume:get_snapshot": ["role":"compute-user"], "volume:get_all_snapshots": ["role":"compute-user"], "network:get_all_networks": ["role":"compute-user"], "network:get_network": ["role":"compute-user"], "network:delete_network": ["role":"compute-user"], "network:disassociate_network": ["role":"compute-user"], "network:get_vifs_by_instance": ["role":"compute-user"], "network:allocate_for_instance": ["role":"compute-user"], "network:deallocate_for_instance": ["role":"compute-user"], "network:validate_networks": ["role":"compute-user"], "network:get_instance_uuids_by_ip_filter": ["role":"compute-user"], "network:get_floating_ip": ["role":"compute-user"], "network:get_floating_ip_pools": ["role":"compute-user"], "network:get_floating_ip_by_address": ["role":"compute-user"], "network:get_floating_ips_by_project": ["role":"compute-user"], "network:get_floating_ips_by_fixed_address": ["role":"compute-user"], "network:allocate_floating_ip": ["role":"compute-user"], "network:deallocate_floating_ip": ["role":"compute-user"], "network:associate_floating_ip": ["role":"compute-user"], "network:disassociate_floating_ip": ["role":"compute-user"], "network:get_fixed_ip": ["role":"compute-user"], "network:add_fixed_ip_to_instance": ["role":"compute-user"], "network:remove_fixed_ip_from_instance": ["role":"compute-user"], "network:add_network_to_project": ["role":"compute-user"], "network:get_instance_nw_info": ["role":"compute-user"], "network:get_dns_domains": ["role":"compute-user"], "network:add_dns_entry": ["role":"compute-user"], "network:modify_dns_entry": ["role":"compute-user"], "network:delete_dns_entry": ["role":"compute-user"], "network:get_dns_entries_by_address": ["role":"compute-user"], "network:get_dns_entries_by_name": ["role":"compute-user"], "network:create_private_dns_domain": ["role":"compute-user"], "network:create_public_dns_domain": ["role":"compute-user"], "network:delete_dns_domain": ["role":"compute-user"] }