mistral-extra/examples/v2/capabilities/join

"join" control example (based on v2 API/DSL)

Workflow create_vm_with_volume demonstrates usage of join workflow control to synchronize multiple workflow routes. Specifically, it creates a virtual machine and Cinder volume in parallel, waits till their completion using join and attaches the volume to the newly created virtual machine.

Note: Unlike some other examples this example doesn't use workbook concept. File create_vm_with_volume.yaml contains a workflow definition in the first place so in order to load the workflow "mistral workflow-create" CLI command must be used (not "mistral workbook-create").

To run the example:

1. Load workflow create_vm_with_volume.yaml:

   mistral workflow-create create_vm_with_volume.yaml

2. Create input.json file containing workflow input parameters as follows:

   {
       "server_name": "mistral_test_vm",
       "image_id": "aaacd887-5afa-4cb7-a33d-1ef0b72d21c4",
       "flavor_id": "2",
       "ssh_username": "ubuntu",
       "ssh_password": "my_pass",
       "volume_name": "mistral_test_volume"
   }

3. Start workflow:

   mistral execution-create create_vm_with_volume input.json

4. Using execution id from the previous step wait for completion (workflow SUCCESS state):

   mistral execution-get <execution_id>

5. Make sure that a virtual machine and a volume have been created. It can be done by opening Horizon UI or using Nova client (python-novaclient).