在按照heat官方文档安装heat时，无法使用openstack domain命令。

openstack domain list
openstack: 'domain' is not an openstack command. See 'openstack --help'.

查看下环境变量：

env | grep ^OS
OS_REGION_NAME=RegionOne
OS_PASSWORD=password
OS_AUTH_URL=http://192.168.1.1:5000/v2.0
OS_USERNAME=admin
OS_TENANT_NAME=admin

环境变量用的是OpenStack Identity API v2.0，这就是问题的关键，domain子命令不支持OpenStack Identity API v2.0，支持OpenStack Identity API v3.0.

export OS_AUTH_URL=http://192.168.1.1:5000
export OS_IDENTITY_API_VERSION=3

openstack domain list
+---------+---------+---------+--------------------+
| ID      | Name    | Enabled | Description        |
+---------+---------+---------+--------------------+
| default | Default | True    | The default domain |
+---------+---------+---------+--------------------+