1e20b04c87
Sometimes people get confused when DSL is used. So, to overcome it Mistral Workflow Language is used instead of DSL throughout the documentation. Change-Id: Ic7516b4f45854fd9960cef3e529dcb507439f8e6 Partially-implements: blueprint add-documentation
171 lines
7.8 KiB
ReStructuredText
171 lines
7.8 KiB
ReStructuredText
Quick Start
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===========
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Prerequisites
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-------------
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Before you start following this guide, make sure you have completed these
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three prerequisites.
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Install and run Mistral
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~~~~~~~~~~~~~~~~~~~~~~~
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Go through the installation manual: :doc:`Mistral Installation Guide </guides/installation_guide>`
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Install Mistral client
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~~~~~~~~~~~~~~~~~~~~~~
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To install mistralclient, please refer to :doc:`Mistral Client / CLI Guide </guides/mistralclient_guide>`
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Export Keystone credentials
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~~~~~~~~~~~~~~~~~~~~~~~~~~~
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To use the OpenStack command line tools you should specify environment
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variables with the configuration details for your OpenStack installation. The
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following example assumes that the Identity service is at ``127.0.0.1:5000``,
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with a user ``admin`` in the ``admin`` tenant whose password is ``password``:
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.. code-block:: bash
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$ export OS_AUTH_URL=http://127.0.0.1:5000/v2.0/
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$ export OS_TENANT_NAME=admin
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$ export OS_USERNAME=admin
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$ export OS_PASSWORD=password
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Write a workflow
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----------------
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For example, we have the following workflow.
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.. code-block:: mistral
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---
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version: "2.0"
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my_workflow:
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type: direct
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input:
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- names
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tasks:
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task1:
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with-items: name in <% $.names %>
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action: std.echo output=<% $.name %>
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on-success: task2
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task2:
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action: std.echo output="Done"
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This simple workflow iterates through a list of names in ``task1`` (using
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`with-items`), stores them as a task result (using the `std.echo` action) and
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then stores the word "Done" as a result of the second task (`task2`).
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To learn more about the Mistral Workflows and what you can do, read the
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:doc:`Mistral Workflow Language specification </dsl/dsl_v2>`
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Upload the workflow
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-------------------
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Use the *Mistral CLI* to create the workflow::
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$ mistral workflow-create <workflow.yaml>
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The output should look similar to this::
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+------------------------------------+-------------+--------+---------+---------------------+------------+
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|ID | Name | Tags | Input | Created at | Updated at |
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+------------------------------------+-------------+--------+---------+---------------------+------------+
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|9b719d62-2ced-47d3-b500-73261bb0b2ad| my_workflow | <none> | names | 2015-08-13 08:44:49 | None |
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+------------------------------------+-------------+--------+---------+---------------------+------------+
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Run the workflow and check the result
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-------------------------------------
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Use the *Mistral CLI* to start the new workflow, passing in a list of names
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as JSON::
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$ mistral execution-create my_workflow '{"names": ["John", "Mistral", "Ivan", "Crystal"]}'
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Make sure the output is like the following::
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+-------------------+--------------------------------------+
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| Field | Value |
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+-------------------+--------------------------------------+
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| ID | 49213eb5-196c-421f-b436-775849b55040 |
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| Workflow ID | 9b719d62-2ced-47d3-b500-73261bb0b2ad |
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| Workflow name | my_workflow |
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| Description | |
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| Task Execution ID | <none> |
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| State | RUNNING |
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| State info | None |
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| Created at | 2017-03-06 11:24:10 |
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| Updated at | 2017-03-06 11:24:10 |
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+-------------------+--------------------------------------+
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After a moment, check the status of the workflow execution (replace the
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example execution id with the ID output above)::
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$ mistral execution-get 49213eb5-196c-421f-b436-775849b55040
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+-------------------+--------------------------------------+
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| Field | Value |
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+-------------------+--------------------------------------+
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| ID | 49213eb5-196c-421f-b436-775849b55040 |
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| Workflow ID | 9b719d62-2ced-47d3-b500-73261bb0b2ad |
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| Workflow name | my_workflow |
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| Description | |
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| Task Execution ID | <none> |
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| State | SUCCESS |
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| State info | None |
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| Created at | 2017-03-06 11:24:10 |
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| Updated at | 2017-03-06 11:24:20 |
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+-------------------+--------------------------------------+
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The status of each **task** also can be checked::
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$ mistral task-list 49213eb5-196c-421f-b436-775849b55040
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+--------------------------------------+-------+---------------+--------------------------------------+---------+------------+---------------------+---------------------+
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| ID | Name | Workflow name | Execution ID | State | State info | Created at | Updated at |
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+--------------------------------------+-------+---------------+--------------------------------------+---------+------------+---------------------+---------------------+
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| f639e7a9-9609-468e-aa08-7650e1472efe | task1 | my_workflow | 49213eb5-196c-421f-b436-775849b55040 | SUCCESS | None | 2017-03-06 11:24:11 | 2017-03-06 11:24:17 |
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| d565c5a0-f46f-4ebe-8655-9eb6796307a3 | task2 | my_workflow | 49213eb5-196c-421f-b436-775849b55040 | SUCCESS | None | 2017-03-06 11:24:17 | 2017-03-06 11:24:18 |
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+--------------------------------------+-------+---------------+--------------------------------------+---------+------------+---------------------+---------------------+
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Check the result of task *'task1'*::
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$ mistral task-get-result f639e7a9-9609-468e-aa08-7650e1472efe
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[
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"John",
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"Mistral",
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"Ivan",
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"Crystal"
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]
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If needed, we can go deeper and look at a list of the results of the
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**action_executions** of a single task::
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$ mistral action-execution-list f639e7a9-9609-468e-aa08-7650e1472efe
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+--------------------------------------+----------+---------------+-----------+--------------------------------------+---------+----------+---------------------+---------------------+
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| ID | Name | Workflow name | Task name | Task ID | State | Accepted | Created at | Updated at |
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+--------------------------------------+----------+---------------+-----------+--------------------------------------+---------+----------+---------------------+---------------------+
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| 4e0a60be-04df-42d7-aa59-5107e599d079 | std.echo | my_workflow | task1 | f639e7a9-9609-468e-aa08-7650e1472efe | SUCCESS | True | 2017-03-06 11:24:12 | 2017-03-06 11:24:16 |
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| 5bd95da4-9b29-4a79-bcb1-298abd659bd6 | std.echo | my_workflow | task1 | f639e7a9-9609-468e-aa08-7650e1472efe | SUCCESS | True | 2017-03-06 11:24:12 | 2017-03-06 11:24:16 |
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| 6ae6c19e-b51b-4910-9e0e-96c788093715 | std.echo | my_workflow | task1 | f639e7a9-9609-468e-aa08-7650e1472efe | SUCCESS | True | 2017-03-06 11:24:12 | 2017-03-06 11:24:16 |
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| bed5a6a2-c1d8-460f-a2a5-b36f72f85e19 | std.echo | my_workflow | task1 | f639e7a9-9609-468e-aa08-7650e1472efe | SUCCESS | True | 2017-03-06 11:24:12 | 2017-03-06 11:24:17 |
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+--------------------------------------+----------+---------------+-----------+--------------------------------------+---------+----------+---------------------+---------------------+
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Check the result of the first **action_execution**::
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$ mistral action-execution-get-output 4e0a60be-04df-42d7-aa59-5107e599d079
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{
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"result": "John"
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}
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**Congratulations! Now you are ready to use OpenStack Workflow Service!**
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