Automation & Scripting Flashcards

In openstacksdk, which method is used to establish a connection to an OpenStack cloud using clouds.yaml?

Answer: openstack.connect()

openstack.connect() reads credentials from clouds.yaml or environment variables and returns a Connection object for interacting with OpenStack services.

Which file format does the OpenStack CLI use by default to store cloud credentials for multiple environments?

Answer: clouds.yaml

clouds.yaml is the preferred multi-cloud configuration file that stores credentials and endpoints for multiple OpenStack environments.

In a HOT template, how do you reference the ID of a resource named 'my_server' within the same template?

Answer: {get_resource: my_server}

The 'get_resource' intrinsic function returns the resource ID of another resource defined in the same HOT template.

Which Ansible inventory plugin dynamically fetches OpenStack instances as inventory hosts?

Answer: openstack.cloud.inventory

The 'openstack.cloud.inventory' plugin queries Nova to build a dynamic inventory of running OpenStack instances.

When scripting with the OpenStack CLI, which flag outputs results in a machine-parseable format best suited for shell scripting?

Answer: -f value

The '-f value' format outputs plain values without headers or borders, making it easiest to parse in shell scripts with standard tools like awk or cut.

Which Heat resource type provisions a new Nova server instance in a HOT template?

Answer: OS::Nova::Server

'OS::Nova::Server' is the Heat resource type used to define and launch a Nova compute instance within a stack.

Which environment variable must be exported before running OpenStack CLI commands when using openrc authentication?

Answer: OS_AUTH_URL

OS_AUTH_URL points the CLI to the Keystone identity endpoint and is required for authentication with all OpenStack services.