Week 2: Introduction to Cloud Computing Flashcards
Definition of Cloud Services
Services that are expressed by a cloud and delivered over the Internet or a private network. Services range from infrastructure-as-a-service (laaS), to platform-as-a-service (PaaS), and software-as-a-service (SaaS), and include other services that are layered on these basic service models.
Definition of Cloud Computing
An IT model or computing environment composed of IT components (hardware, software, networking, and services) as well as the processes around the deployment of these elements that together enable us to develop and deliver cloud services via the Internet or a private network.
This cloud model is composed of ___essential characteristics, ___service models, and ____deployment models.
five, three, four
Definition of Cloud Computing (2/2)
Cloud computing is a model for enabling ubiquitous, convenient, on-demandnetwork access to a sharedpool of configurablecomputing resources (e.g., networks, servers, storage, applications, and services) that can be rapidly provisioned and releasedwith minimal management effort or service provider interaction.
Essential Characteristics
On-demand self-service Broad network access Rapid elasticity Resource pooling Measured service
On-demand self-service
A consumer can unilaterally provision computing capabilities, such as server time and network storage, as needed automatically without requiring human interaction with each service provider
Broad network access
Capabilities are available over the network and accessed through standard mechanisms that promote use by heterogeneous thin or thick client platforms
• e.g., mobile phones, tablets, laptops, and workstations
Rapid elasticity
Capabilities can be elastically provisioned and released, in some cases automatically, to scale rapidly outward and inward commensurate with demand
To the consumer, the capabilities available for provisioning often appear to be unlimited and can be appropriated in any quantity at any time
Resource pooling
The provider’s computing resources are pooled to serve multiple consumers using a multi-tenant model, with different physical and virtual resources dynamically assigned and reassigned according to consumer demand
Measured service
Cloud systems automatically control and optimize resource useby leveraging a metering capabilityat some level of abstraction appropriate to the type of service (e.g., storage, processing, bandwidth, and active user accounts)
Resource usage can be monitored, controlled, and reported, providing transparencyfor both the provider and consumer of the utilized service
Service Models
Software as a Service (SaaS)
Platform as a Service (PaaS)
Infrastructure as a Service (IaaS)
Software as a Service (SaaS)
The capability provided to the consumer is to use the provider’s applications running on a cloud infrastructure
The consumer does not manage or control the underlying cloud infrastructureincluding network, servers, operating systems, storage, or even individual application capabilities, with the possible exception of limited user-specific application configuration settings
Platform as a Service
The capability provided to the consumer is to deploy onto the cloud infrastructure consumer-created or acquired applicationscreated using programming languages, libraries, services, and tools supported by the provider
The consumer does not manage or control the underlying cloud infrastructure including network, servers, operating systems, or storage, but has control over the deployed applicationsand possibly configuration settings for the application-hosting environment
Infrastructure as a Service (IaaS)
The capability provided to the consumer is to provision processing, storage, networks, and other fundamental computing resourceswhere the consumer is able to deploy and run arbitrary software, which can include operating systems and applications
The consumer does not manage or control the underlying cloud infrastructurebut has control over operating systems, storage, and deployed applicationsand possibly limited control of select networking components(e.g., host firewalls)
Deployment Models
Private cloud
Community cloud
Public cloud
Hybrid cloud
Private cloud
The cloud infrastructure is provisioned for exclusive use by a single organizationcomprising multiple consumers (e.g., business units)
It may be owned, managed, and operated by the organization, a third party, or some combination of them, and it may exist on or off premises
Community cloud
The cloud infrastructure is provisioned for exclusive use by a specific community of consumersfrom organizations that have shared concerns
• e.g., mission, security requirements, policy, and compliance considerations
It may be owned, managed, and operated by one or more of the organizations in the community, a third party, or some combination of them, and it may exist on or off premises
Public cloud
The cloud infrastructure is provisioned for open use by the general public
It may be owned, managed, and operated by a business, academic, or government organization, or some combination of them
It exists on the premises of the cloud provider
Hybrid cloud
The cloud infrastructure is a composition of two or more distinct cloud infrastructures(private, community, or public) that remain unique entities, but are bound together by standardized or proprietary technology that enables data and application portability
e.g., cloud bursting for load balancing between clouds
cloud infrastructure
collection of hardware and software that enables the five essential characteristics of cloud computing
The cloud infrastructure can be viewed as containing both a __and an ___
physical layer, abstraction layer
physical layer (in cloud)
consists of the hardware resources that are necessary to support the cloud services being provided
