Architecture and Services Flashcards

Which OpenStack service provides workflow automation and task coordination across multiple cloud services?

Answer: Mistral

Mistral is the OpenStack Workflow service that allows users to define, execute, and manage workflows involving multiple cloud services.

In OpenStack Swift, what is a 'ring' file used for?

Answer: Mapping object locations to physical storage nodes via consistent hashing

Swift ring files use consistent hashing to determine which storage nodes hold copies of a given object, container, or account.

What is the OpenStack Octavia service?

Answer: A load balancing service that replaces the Neutron LBaaS v2 extension

Octavia is the OpenStack Load Balancer service that provides scalable, operator-grade load balancing using Amphora instances.

Which configuration file controls the Nova scheduler's filtering and weighing behavior?

Answer: /etc/nova/nova.conf (scheduler_driver, enabled_filters)

The Nova scheduler's filter and weigher configuration is defined in nova.conf under the [filter_scheduler] section, specifying enabled_filters and weight_classes.

What is the default replication factor (replica count) for data stored in OpenStack Swift?

Answer: 3

Swift's default replication policy stores 3 replicas of each object across different zones to ensure durability and availability.

Which OpenStack service is used to reserve cloud resources in advance for a specific time window?

Answer: Blazar

Blazar (formerly Climate) is the OpenStack Resource Reservation service that allows users to reserve compute, network, and other resources ahead of time.

In OpenStack Keystone, what is a 'domain' used for?

Answer: Creating an administrative boundary grouping users, groups, and projects

A Keystone domain is a high-level administrative container that groups users, groups, and projects, enabling multi-tenancy at the organizational level.