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CHPC Cloud Resources
Glossary of Terms
A
Availability zone - An Amazon EC2 concept of an isolated area that is used for fault tolerance. Do not confuse with an OpenStack Compute zone or cell.
B
C
CIDR ??
CEPH - Massively scalable distributed storage system that consists of an object store, block store, and POSIX-compatible distributed file system. Compatible with OpenStack. D
Port - A virtual network port within Networking; VIFs / vNICs are connected to a port.
Ingress - The process of filtering incoming network traffic. Supported by Compute.
E
Ephemeral volume - Volume that does not save the changes made to it and reverts to its original state when the current user relinquishes control.
External Network - A network segment typically used for instance Internet access.
F
Floating IPs - An IP address that a project can associate with a VM so that the instance has the same public IP address each time that it boots. You create a pool of floating IP addresses and assign them to instances as they are launched to maintain a consistent IP address for maintaining DNS assignment.
Flavor - is an available hardware configuration for a VM instance. It defines the size of a virtual server that can be launched. Flavors define the compute, memory, and storage capacity of nova computing instances.
G
GateWay IP - An IP address, typically assigned to a router, that passes network traffic between different networks. H
I
Instances - A running VM, or a VM in a known state such as suspended, that can be used like a hardware server.
Images - A collection of files for a specific operating system (OS) that you use to create or rebuild a server. OpenStack provides pre-built images. You can also create custom images, or snapshots, from servers that you have launched. Custom images can be used for data backups or as images for additional servers.
J K L M N O
P
Persistent volume - Changes to these types of disk volumes are saved.
Public image - An Image service VM image that is available to all projects.
Public Key Authentication - Authentication method that uses keys rather than passwords Backups.
Q R S
Subnet - Logical subdivision of an IP network.
SSH keys- ??
Security group - A set of network traffic filtering rules that are applied to a Compute instance.
T U
V
Volumes - Disk-based data storage generally represented as an iSCSI target with a file system that supports extended attributes; can be persistent or ephemeral.
W X Y Z
Network - A virtual network that provides connectivity between entities. For example, a collection of virtual ports that share network connectivity. In Networking terminology, a network is always a layer-2 network.
Openstack - OpenStack is a cloud operating system that controls large pools of compute, storage, and networking resources throughout a data center, all managed through a dashboard that gives administrators control while empowering their users to provision resources through a web interface. OpenStack is an open source project licensed under the Apache License 2.0.
XFS - High-performance 64-bit file system created by Silicon Graphics. Excels in parallel I/O operations and data consistency.
Key pairs - are SSH credentials that are injected into an instance when it is launched.A key pair belongs to an individual user, not to a project. To share a key pair across multiple users, each user needs to import that key pair.
X509 Certificate - is a standard format for public key certificates, digital documents that securely associate cryptographic key pairs with identities such as websites, individuals, or organizations.
RAW - One of the VM image disk formats supported by Image service; an unstructured disk image.
QCOW2 - One of the VM image disk formats supported by Image service.
Live migration - The ability within Compute to move running virtual machine instances from one host to another with only a small service interruption during switchover.
Routers - A physical or virtual network device that passes network traffic between
