OpenStack OpenStack Orchestration (Heat) 2

Question 1

Which OpenStack CLI command is used to create a new Heat stack from a template file?

Accepted Answer

openstack stack create

Answer

The 'openstack stack create' command is the current unified CLI command for creating a Heat stack from a template.

Question 2

What is the purpose of the 'get_attr' intrinsic function in Heat?

Accepted Answer

To retrieve an attribute value from a resource defined in the template

Answer

'get_attr' retrieves a specific attribute (e.g., IP address, port) from a resource defined within the same Heat template.

Question 3

What is a Heat environment file used for?

Accepted Answer

To override template parameters and resource registry mappings without modifying the template

Answer

A Heat environment file allows operators to supply parameter values and resource registry overrides externally, keeping templates clean and reusable.

Question 4

Which Heat resource type is used to create an auto-scaling group?

Accepted Answer

OS::Heat::AutoScalingGroup

Answer

OS::Heat::AutoScalingGroup is the resource type used to define a collection of identical resources that can scale in or out.

Question 5

In a Heat template, what does 'depends_on' accomplish?

Accepted Answer

Explicitly defines the creation order between resources that Heat cannot automatically determine

Answer

'depends_on' lets you explicitly state that one resource must be created before another, overriding Heat's automatic dependency resolution.

OpenStack Practice Test