Cloud computing is the use of computing resources that are delivered as service over the network. Mainly three types of service models are there in cloud computing.
1. Infrastructure as a service
2. Platform as a service
3. Software as a service
1. Infrastructure as a service
In this service model, cloud providers offers computers, as physical or more often the virtual machines and other resources. The virtual machines are run as guest machine by hypervisors such as KVM or XEN.
Other resources in IAAS cloud includes image in virtual image library, raw and file based storage, load balancers, firewalls, ip addresses.
To deploy their applications, cloud users then install operating system images on the machines as well as there application softwares. In this model, it is the cloud user who is responsible for patching and maintaining the operating systems and application software. Cloud providers typically bill IaaS services on a utility computing basis, that is, cost will reflect the amount of resources allocated and consumed.
2. Platform as a service
In the PaaS model, cloud providers deliver a computing platformtypically including operating system, programming language execution environment, database, and web server. Application developers can develop and run their software solutions on a cloud platform without the cost and complexity of buying and managing the underlying hardware and software layers. With some PaaS offers, the underlying computer and storage resources scale automatically to match application demand such that cloud user does not have to allocate resources manually.
3. Software as a service
In this model, cloud providers install and operate application software in the cloud and cloud users access the software from cloud clients. The cloud users do not manage the cloud infrastructure and platform on which the application is running. This eliminates the need to install and run the application on the cloud user's own computers simplifying maintenance and support. What makes a cloud application different from other applications is its scalability. This can be achieved by cloning tasks onto multiple virtual machines at run-time to meet the changing work demand. Load balancers distribute the work over the set of virtual machines. This process is transparent to the cloud user who sees only a single access point. To accommodate a large number of cloud users, cloud applications can be multitenant, that is, any machine serves more than one cloud user organization.
1. Infrastructure as a service
2. Platform as a service
3. Software as a service
1. Infrastructure as a service
In this service model, cloud providers offers computers, as physical or more often the virtual machines and other resources. The virtual machines are run as guest machine by hypervisors such as KVM or XEN.
Other resources in IAAS cloud includes image in virtual image library, raw and file based storage, load balancers, firewalls, ip addresses.
To deploy their applications, cloud users then install operating system images on the machines as well as there application softwares. In this model, it is the cloud user who is responsible for patching and maintaining the operating systems and application software. Cloud providers typically bill IaaS services on a utility computing basis, that is, cost will reflect the amount of resources allocated and consumed.
2. Platform as a service
In the PaaS model, cloud providers deliver a computing platformtypically including operating system, programming language execution environment, database, and web server. Application developers can develop and run their software solutions on a cloud platform without the cost and complexity of buying and managing the underlying hardware and software layers. With some PaaS offers, the underlying computer and storage resources scale automatically to match application demand such that cloud user does not have to allocate resources manually.
3. Software as a service
In this model, cloud providers install and operate application software in the cloud and cloud users access the software from cloud clients. The cloud users do not manage the cloud infrastructure and platform on which the application is running. This eliminates the need to install and run the application on the cloud user's own computers simplifying maintenance and support. What makes a cloud application different from other applications is its scalability. This can be achieved by cloning tasks onto multiple virtual machines at run-time to meet the changing work demand. Load balancers distribute the work over the set of virtual machines. This process is transparent to the cloud user who sees only a single access point. To accommodate a large number of cloud users, cloud applications can be multitenant, that is, any machine serves more than one cloud user organization.
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