OpenStack Heat & Orchestration Flashcards

What is a Heat environment file used for?

Answer: Overriding template parameters and resource registrations without modifying the template

Environment files allow operators to provide parameter defaults, override values, and register custom resource types without altering the original template.

Which intrinsic function in HOT is used to reference the value of a parameter defined in the same template?

Answer: get_param

The 'get_param' intrinsic function retrieves the value of a parameter defined in the 'parameters' section of the template.

What does the 'get_resource' intrinsic function return in a HOT template?

Answer: The UUID or name identifier of a resource defined in the template

The 'get_resource' function returns the ID (UUID or name) of a resource defined in the same template's 'resources' section, enabling resource interdependencies.

Which command lists all stacks in the current project along with their status?

Answer: openstack stack list

The 'openstack stack list' command displays all stacks accessible in the current project, showing their names, IDs, and statuses.

What happens to resources in a Heat stack when the stack is deleted?

Answer: All resources defined in the stack are deleted by default

Deleting a Heat stack triggers deletion of all resources it manages, making Heat stacks the atomic unit of lifecycle management.

What is a 'nested stack' in Heat orchestration?

Answer: A stack referenced as a resource within another template, enabling modular design

Nested stacks allow a template to reference another template as a resource type, enabling modular, reusable infrastructure components.

Which Heat resource type is used to create an OpenStack Nova compute instance?

Answer: OS::Nova::Server

The resource type 'OS::Nova::Server' is the correct Heat resource type for creating a compute instance managed by OpenStack Nova.