OpenStack provides various services to manage cloud infrastructure resources, including compute nodes and virtual machines (VMs). Let's analyze each option:
A . Keystone
Incorrect: Keystone is the OpenStack identity service responsible for authentication and authorization. It does not display server details of compute nodes.
B . Neutron
Incorrect: Neutron is the OpenStack networking service that manages virtual networks, routers, and IP addresses. It is unrelated to displaying server details of compute nodes.
C . Cinder
Incorrect: Cinder is the OpenStack block storage service that provides persistent storage volumes for VMs. It does not display server details of compute nodes.
D . Nova
Correct: Nova is the OpenStack compute service responsible for managing the lifecycle of virtual machines, including provisioning, scheduling, and monitoring. It also provides detailed information about compute nodes and VMs, such as CPU, memory, and disk usage.
Why Nova?
Compute Node Management: Nova manages compute nodes and provides APIs to retrieve server details, including resource utilization and VM status.
Integration with CLI/REST APIs: Commands like openstack server show or nova hypervisor-show can be used to display compute node and VM details.
JNCIA Cloud Reference:
The JNCIA-Cloud certification covers OpenStack services, including Nova, as part of its cloud infrastructure curriculum. Understanding Nova's role in managing compute resources is essential for operating OpenStack environments.
For example, Juniper Contrail integrates with OpenStack Nova to provide advanced networking and security features for compute nodes and VMs.
Reference:
OpenStack Nova Documentation
Juniper JNCIA-Cloud Study Guide: OpenStack Services