Heat Update Stack Preview result in misleading result

[Govind Agrawal]

Steps to reproduce problem:
Step 1: Create stack using Template.yaml
Step 2: Update same stack which was created in step 1 using same Heat Template (Template.yaml)
Step 3: Stack update preview shows following result:

+-----------+------------------+--------------------+--------------------------------------------------------+
| state | resource_name | resource_type | resource_identity |
+-----------+------------------+--------------------+--------------------------------------------------------+
| unchanged | gpb_ext1_port | OS::Neutron::Port | { |
| | | | "stack_name": "forGovind", |
| | | | "stack_id": "6ae8c838-d943-4e7a-be83-0472d74ba2a6", |
| | | | "tenant": "68dee30f86344f14a650d0c75813801d", |
| | | | "path": "/resources/gpb_ext1_port" |
| | | | } |
| unchanged | volumegov | OS::Cinder::Volume | { |
| | | | "stack_name": "forGovind", |
| | | | "stack_id": "6ae8c838-d943-4e7a-be83-0472d74ba2a6", |
| | | | "tenant": "68dee30f86344f14a650d0c75813801d", |
| | | | "path": "/resources/volumegov" |
| | | | } |
| updated | instancegovmain- | OS::Nova::Server | { |
| | | | "stack_name": "forGovind", |
| | | | "stack_id": "6ae8c838-d943-4e7a-be83-0472d74ba2a6", |
| | | | "tenant": "68dee30f86344f14a650d0c75813801d", |
| | | | "path": "/resources/instancegovmain-" |
| | | | } |
+-----------+------------------+--------------------+--------------------------------------------------------+

I am wondering if i use the same template then why it is showing os::nova::server resource as updated ?

Please revert.

========================
Heat Template Content
File name : Template.yaml
========================

heat_template_version: 2013-05-23

resources:
  volumegov:
    properties:
      size: 1
    type: "OS::Cinder::Volume"

  gpb_ext1_port:
    type: OS::Neutron::Port
    properties:
      network: 551be7be-0386-447b-ba3b-91388a100c02

  instancegovmain-:
    properties:
      flavor: 205bb2df-d4fa-4478-bf97-cb2e69d440b5
      image: 26b9f717-137e-41e0-adbe-78346f72ba63
      networks:
        - port: { get_resource: gpb_ext1_port }
    type: "OS::Nova::Server"

[Kashif Siddiqui (kashif.siddiqui)]

Which heat version are you using btw?

I can also reproduce this issue.

[Kashif Siddiqui (kashif.siddiqui)]

I think it caused by the port which changes from None ==> <Port>

May 19 13:35:23 ubuntu heat-engine[23204]: ResourceDefinition(u'instancegovmain-', u'OS::Nova::Server', properties={u'flavor': u'm1.tiny', u'image': u'cirros-0.3.5-x86_64-disk', u'networks': [{u'port': None}]}, metadata=None, depends=None, deletion_policy=None, update_policy=None, condition=None)

May 19 13:35:23 ubuntu heat-engine[23204]: ResourceDefinition(u'instancegovmain-', u'OS::Nova::Server', properties={u'flavor': u'm1.tiny', u'image': u'cirros-0.3.5-x86_64-disk', u'networks': [{u'port': u'6a6f820d-257a-48e6-bc91-86bda848aceb'}]}, metadata=None, depends=None, deletion_policy=None, update_policy=None, condition=None)

Notice the port got some id. Hence showing as updated.

[Rabi Mishra (rabi)]

Yeah, looks like it's broken. Feel free to propose a patch.

[Govind Agrawal (govind12)]

There is a one more scenario where i saw this problem.

Step 1) create Heat Stack using server resource where property flavor is mentioned as flavor name instead of flavor UUID.

Step 2) Update heat stack preview with the same template what you used in step 1 , output says "os::nova::server" resource is updated.

Solution: use flavor UUID instead of flavor name.

[Kaz Shinohara (kazsh)]

Looks nobody is working for this, I will propose the patch. Thanks.

[Govind Agrawal (govind12)]

Hi Kazunori,

could you please look into below bug as well as it is also related to Update Heat Stack preview :
https://bugs.launchpad.net/heat/+bug/1689355

while we are adding new os::nova::server resources and perform the "UPDATE HEAT STACK PREVIEW", the output in update preview for added resources is not identical what we get using "HEAT STACK CREATE PREVIEW".

For e.g. flavor and os-extended-volumes:volumes_attached not appear in HEAT STACK UPDATE PREVIEW

[Kaz Shinohara (kazsh)]

ok, will check that also.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/493852