gcloud deployment-manager undefined properties: UndefinedError: 'properties' is undefined - properties

Question

There is sample code here that uses the following code snippet to handle undefined properties.
{% if properties["cidr"] is defined %}
{% set cidr = properties["cidr"] %}
{% else %}
{% set cidr = "10.10.0.0/16" %}
{% endif %}
github deployment-manager example
However, when I attempt to use similar code:
{% if properties['prod'] is defined %}
{% set machine_type = 'n1-highmem-8' %}
{% set num_nodes = 3 %}
{% else %}
{% set machine_type = 'g1-small' %}
{% set num_nodes = 1 %}
{% endif %}
and deploy as follows:
gcloud deployment-manager deployments create xxx --template kubernetes.jinja --automatic-rollback-on-error --preview
I get the following error:
- code: MANIFEST_EXPANSION_USER_ERROR location: /deployments/xxx/manifests/manifest-1597981115450 message: |-
Manifest expansion encountered the following errors: Exception in kubernetes.jinja
Traceback (most recent call last):
return template.render(resource)
return self.environment.handle_exception(exc_info, True)
reraise(exc_type, exc_value, tb)
File "<template>", line 19, in top-level template code
return obj[argument]
UndefinedError: 'properties' is undefined
Resource: kubernetes.jinja Resource: config
When I deploy with properties it works.
gcloud deployment-manager deployments create xxx --template kubernetes.jinja --automatic-rollback-on-error --preview --properties prod:false
How can I setup a jinja script to have default values and/or detect missing properties without throwing an exception?
UPDATE:
Adding ANY property, even a different one seems to be enough to have the script execute. It appears the properties attribute is COMPLETELY missing by default!
gcloud deployment-manager deployments create xxx --template kubernetes.jinja --automatic-rollback-on-error --preview --properties adsfsdfsdf:Asdfasdfasdf

Answer 1

You need to define properties either in the config that uses the template or when deploying from the command line.
See: https://cloud.google.com/deployment-manager/docs/configuration/templates/define-template-properties
E.g.
gcloud deployment-manager deployments create xxx \
--template=kubernetes.jinja \
--properties=prod:...