openstack/deb-mistral
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Merge "Update documentation for multi-vim support"

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doc/source/guides/mistralclient_guide.rst
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@ -701,3 +701,71 @@ List all services.
.. seealso:: .. seealso::
`Workflow service command-line client <http://docs.openstack.org/cli-reference/mistral.html>`_. `Workflow service command-line client <http://docs.openstack.org/cli-reference/mistral.html>`_.
Targeting non-preconfigured clouds
----------------------------------
Mistral is capable of executing workflows on external OpenStack clouds, different from the one defined in the `mistral.conf`
file in the `keystone_authtoken` section. (More detail in the :doc:`configuration_guide`).
For example, if the mistral server is configured to authenticate with the `http://keystone1.example.com` cloud
and the user wants to execute the workflow on the `http://keystone2.example.com` cloud.
The mistral.conf will look like::
[keystone_authtoken]
auth_uri = http://keystone1.example.com:5000/v3
...
The client side parameters will be::
export OS_AUTH_URL=http://keystone1.example.com:5000/v3
export OS_USERNAME=mistral_user
...
export OS_TARGET_AUTH_URL=http://keystone2.example.com:5000/v3
export OS_TARGET_USERNAME=cloud_user
...
.. note:: Every `OS_*` parameter has an `OS_TARGET_*` correspondent. For more detail, check out `mistral --help`
The `OS_*` parameters are used to authenticate and authorize the user with Mistral,
that is, to check if the user is allowed to utilize the Mistral service. Whereas
the `OS_TARGET_*` parameters are used to define the user that executes the workflow
on the external cloud, keystone2.example.com/.
Use cases
^^^^^^^^^
**Authenticate in Mistral and execute OpenStack actions with different users**
As a user of Mistral, I want to execute a workflow with a different user on the cloud.
**Execute workflows on any OpenStack cloud**
As a user of Mistral, I want to execute a workflow on a cloud of my choice.
Special cases
^^^^^^^^^^^^^
**Using Mistral with zero OpenStack configuration**:
With the targeting feature, it is possible to execute a workflow on any arbitrary cloud
without additional configuration on the Mistral server side. If authentication is
turned off in the Mistral server (Pecan's `auth_enable = False` option in `mistral.conf`), there
is no need to set the `keystone_authtoken` section. It is possible to have Mistral
use an external OpenStack cloud even when it isn't deploy in an OpenStack
environment (i.e. no Keystone integration).
With this setup, the following call will return the heat stack list::
mistral \
--os-target-auth-url=http://keystone2.example.com:5000/v3 \
--os-target-username=testuser \
--os-target-tenant=testtenant \
--os-target-password="MistralRuleZ" \
run-action heat.stacks_list
This setup is particularly useful when Mistral is used in standalone mode, when the
Mistral service is not part of the OpenStack cloud and runs separately.
Note that only the OS-TARGET-* parameters enable this operation.