COA Identity, Image, and Compute Management

Question 1

What is the primary function of Keystone in OpenStack?

Accepted Answer

Identity and access management

Answer

Keystone is the central identity service for OpenStack, handling authentication and authorization for all components. It manages users, projects (tenants), and roles, ensuring secure access control and single sign-on capabilities across the entire OpenStack deployment.

Question 2

Which OpenStack service is responsible for managing virtual machine images?

Accepted Answer

Glance

Answer

Glance is the image service in OpenStack, specifically designed to manage virtual machine images. It provides a catalog where users can store, discover, and retrieve various operating system images, which are then used by Nova to launch new instances.

Question 3

Which component manages the lifecycle of compute instances in OpenStack?

Accepted Answer

Nova

Answer

Nova is the core compute service in OpenStack, responsible for the entire lifecycle management of virtual machine instances. This includes provisioning, scheduling, launching, monitoring, and terminating instances, making it central to the compute capabilities of OpenStack.

Question 4

What is required before launching a new instance in OpenStack?

Accepted Answer

Image, flavor, and network settings

Answer

To launch an OpenStack instance, you need an image (the operating system template), a flavor (defining compute resources like CPU, RAM, and disk size), and network settings (to connect the instance to a virtual network). These three elements are fundamental for defining and deploying a functional virtual machine.

Question 5

How are users authenticated in OpenStack?

Accepted Answer

Using Keystone-issued tokens

Answer

OpenStack uses Keystone as its identity service, which authenticates users and issues temporary tokens upon successful login. These tokens are then used to authorize subsequent API requests to other OpenStack services, ensuring secure and consistent access control across the cloud.

(COA) Certified OpenStack Administrator Exam Practice Test

(COA) Certified OpenStack Administrator Exam Practice Test

COA Identity, Image, and Compute Management