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書名： OpenStack Cloud Computing Cookbook（Fourth Edition）
作者名： Kevin Jackson Cody Bunch Egle Sigler James Denton
本章字數： 619字
更新時間： 2021-07-02 16:25:09

Adding users in Keystone

Adding users to OpenStack Identity service requires the user to belong to a domain or a project in the domain and to be assigned a role defined in the domain or the project. For this section, we will create two users. The first user will be named cloud_admin and will have the cloud_admin role assigned to them in the cookbook project. The second user will be named reader and will have the default _member_ role assigned to them in the same cookbook project.

Getting ready

Ensure that you are logged on to a correctly configured OpenStack client and can access the OpenStack environment as a user with admin privileges.

Refer to Chapter 2, The OpenStack Client, for details of setting up your environment to use OpenStack command-line client.

How to do it…

In order to create a user in OpenStack and assign roles to it, we will need to execute the commands listed below.

First, get the bookstore domain ID or domain name:

Using the bookstore domain name, create a new cloud_admin user:

openstack user create --domain bookstore
 --password verysecret
 cloud_admin

Next, get a cookbook project ID or project name:
```
openstack project list
```

Create the reader user in the bookstore domain cookbook project:

openstack user create --domain bookstore
 --project cookbook
 --password verysecret
 reader

Assign cloud_admin user to the admin role:

openstack role add --domain bookstore
 --user cloud_admin
 --role-domain bookstore
 admin

There is no output from this command.

Assign the reader user to the _member_ role:
```
openstack role add --project cookbook
 --user reader _member_
```
There is no output from this command.
List user and role assignment:
```
openstack role assignment list
```
The output will be a matrix of role, user, group, project, and domain IDs. We omit the example output due to sheer size of the table that contains a matrix of IDs for each role, user, group, project, domain, and whether the role was inherited.

How it works…

Adding users in the OpenStack Identity service involves a number of steps and dependencies. First, a domain and a project are required for the user to be part of. A user must always belong to a domain. If there are no custom domains created, a default domain will be used. Once the project exists, the user can be added. At this point, the user has no role associated, so the final step is to assign the role to this user, such as _member_, admin, or a custom role.

To create a user with the user create option, the syntax is as follows:

openstack user create --domain <domain>
 --password <password> <user_name>

The user_name attribute is an arbitrary name, but cannot contain any spaces. A password attribute must be present. In the previous examples, these were set to verysecret. If the domain attribute is not specified, the default domain will be set.

To assign a role to a user with the role add option, the syntax is as follows for the default domain:

openstack role add --project <project>
 --user <user>
 <role>

For a user in a custom domain, use the following syntax to assign a role:

openstack role add --domain <domain>
 --user <user>
 --role-domain <role_domain>
 <role>

The role_domain parameter is the name (or ID) of the domain to which the role belongs.

We will also need to have the names or IDs of the user, role, and project in order to assign roles to users. These names or IDs can be found using the following commands:

openstack project list
 openstack user list
 openstack role list

The --domain <domain> option is only required if custom domains are used. To obtain a list of domains, issue the following command:

openstack domain list

To get a matrix of domain, project, user, and role assignments, use the following command:

openstack 
role assignment list

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OpenStack Cloud Computing Cookbook（Fourth Edition）

Adding users in Keystone

Getting ready

How to do it…

How it works…