Automation & Scripting Flashcards

In a Heat stack, which update policy prevents all instances in an AutoScaling group from being replaced simultaneously?

Answer: rolling_update

The 'rolling_update' policy in OS::Heat::AutoScalingGroup limits how many instances are replaced at once during a stack update.

Which openstacksdk method lists all servers visible to the authenticated user?

Answer: conn.compute.servers()

conn.compute.servers() returns a generator of Server objects from the Nova compute service using the openstacksdk Connection.

When writing a Bash script to wait for a Nova server to reach ACTIVE status, which CLI command is most appropriate to poll?

Answer: openstack server show -f value -c status

Polling 'openstack server show' with '-f value -c status' returns just the status string, which can be checked in a loop until it equals ACTIVE.

Which HOT intrinsic function reads the content of a local file and embeds it as a string value in a template?

Answer: get_file

'get_file' embeds the raw content of a local file (such as a user_data script) directly into the template at the specified path.

Which Ansible module in the openstack.cloud collection attaches a floating IP to an existing server?

Answer: os_floating_ip

The 'os_floating_ip' module allocates and associates a floating IP with an OpenStack server instance.

In a Terraform OpenStack configuration, which resource block creates a Neutron network?

Answer: openstack_networking_network_v2

'openstack_networking_network_v2' is the Terraform resource type for creating a Neutron virtual network in OpenStack.

Which command suspends a running Heat stack's resources without deleting the stack itself?

Answer: openstack stack suspend

'openstack stack suspend' transitions a stack and its resources to a SUSPEND_COMPLETE state without removing the stack definition.