Implementation & Configuration Flashcards
7 cards from real COA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Implementation & Configuration flashcards as text
Which configuration file controls the Nova compute service on a compute node?
Answer: /etc/nova/nova.conf
nova.conf is the primary configuration file for all Nova services including nova-compute on each compute node.
When configuring Keystone with Fernet tokens, which command initializes the Fernet key repository?
Answer: keystone-manage fernet_setup --keystone-user keystone --keystone-group keystone
keystone-manage fernet_setup initializes the Fernet key repository and sets the correct ownership for the key directory.
Which Glance image property signals Nova to use a config drive when booting an instance?
Answer: img_config_drive=mandatory
Setting img_config_drive=mandatory in the Glance image metadata forces Nova to attach a config drive for every instance created from that image.
In an OpenStack deployment, what is the function of the 'placement' service?
Answer: Tracks resource provider inventories and allocations to support Nova scheduling decisions
The Placement API (originally part of Nova) tracks resource inventories like vCPU, RAM, and disk across compute nodes to help the scheduler make placement decisions.
Which OpenStack CLI command lists all available flavors?
Answer: openstack flavor list
The 'openstack flavor list' command displays all available instance flavors defined in Nova.
What does the 'allowed_address_pairs' Neutron port attribute enable?
Answer: Permits traffic from additional IP/MAC addresses beyond the port's assigned address, enabling virtual IPs and failover
allowed_address_pairs lets a port accept traffic destined for additional IP/MAC combinations, which is needed for VRRP, keepalived, or other HA virtual IP setups.
Which command creates a Neutron security group rule to allow inbound SSH (port 22) from any source?
Answer: openstack security group rule create --proto tcp --dst-port 22 --remote-ip 0.0.0.0/0
The correct unified CLI syntax specifies the protocol, destination port, remote IP CIDR, and the target security group name or ID.