Collegenote
- Defining the Cloud
- Cloud Computing
- Emergence of Cloud Computing
- Cloud Based Service Models
- Grid Computing or Cloud Computing
- Components of Cloud Computing
- Cloud Computing Deployment Models
- Benefits of using cloud models
- Legal Issues in Using Cloud Models
- Ethical issues in cloud computing
- Characteristics of Cloud Computing
- Evolution of cloud computing
- Challenges for cloud computing
- Grid Computing
- Distributed Computing in Grid and Cloud
- Cloud Communication
- Communication-as-a-Service (CaaS)
- Advantages of CaaS
- Infrastructure-as-a-Service (IaaS)
- Popular IaaS solutions
- Modern On-Demand Computing
- Amazon’s Elastic Cloud
- Amazon EC2 Service Characteristics
- Elastic IP Addressing
- Monitoring-as-a-Service (MaaS)
- The Traditional On-Premises Model
- Platform-as-a-Service (PaaS)
- Key Characteristics of PaaS
- Software-as-a-Service
- SaaS Implementation Issues
- The key characteristics of SaaS
- Benefits of SaaS Model
- Jericho Cube Model
- XaaS
- Evolution from Managed service providers (MSP) to Cloud Computing
- Single Purpose architectures to multi-purpose architectures
- Service Oriented Architectures (SOA)
- Combining Cloud and SOA
- Characterizing SOA
- Open Source Software in Data Centers
- Data center virtualization
- Cloud data center
Popular IaaS solutions #
Some of the most popular IaaS solutions are discussed as below
Compute as a service: One of the most ubiquitous IaaS offerings today, compute as a service provides compute capacity that includes servers, operating system access, firewalls, routers and load balancing on demand. These systems have management interfaces, and their capacity can be either shared or private. Depending on the provider and the options an enterprise chooses, compute as a service also can include automated patch management, management of infrastructure software, storage management, security management, dedicated customer support and customized SLAs.
Web hosting: Many organizations rely on their websites for marketing and revenue, and any glitch in operations can mean a loss of business. Moving a website to an IaaS based model ensures that the website won’t get bogged down during peak traffic times and that organizations won’t have to overpay for capacity to manage those traffic spikes. What’s more, loads will always be balanced, and uptime is guaranteed, thanks to SLAs. Other perks include offsite backup and fast connections for eliminating slow page and content downloads, no matter how much rich media a site includes.
Storage as Service: Storage as a Service is a business model in which a large company rents space in their storage infrastructure to a smaller company or individual. In the enterprise, SaaS vendors are targeting secondary storage applications by promoting SaaS as a convenient way to manage backups. The key advantage to SaaS in the enterprise is in cost savings -- in personnel, in hardware and in physical storage space. For instance, instead of maintaining a large tape library and arranging to vault (store) tapes offsite, a network administrator that used SaaS for backups could specify what data on the network should be backed up and how often it should be backed up. His company would sign a service level agreement (SLA) whereby the SaaS provider agreed to rent storage space on a cost-per-gigabyte-stored and cost-per-data-transfer basis and the company's data would be automatically transferred at the specified time over the storage provider's proprietary wide area network (WAN) or the Internet. If the company's data ever became corrupt or got lost, the network administrator could contact the SaaS provider and request a copy of the data. Storage as a Service is generally seen as a good alternative for a small or mid-sized business that lacks the capital budget and/or technical personnel to implement and maintain their own storage infrastructure. SaaS is also being promoted as a way for all businesses to mitigate risks in disaster recovery, provide long-term retention for records and enhance both business continuity and availability.
Disaster recovery and backup as a service: The idea behind moving disaster recovery to the cloud is to ensure that organizations have uninterrupted access to data and applications, regardless of emergencies, such as power outages, natural disasters or system failures. These solutions always include redundancy and automatic failover to ensure ongoing access, reducing downtime to nearly zero. Many solutions also employ continuous data protection (CDP), which allows for multiple versions of all data sets to be recovered. This gives users the ability to restore data to any point in time. Data and applications are stored in secure offsite facilities. There are two basic options when it comes to disaster recovery as a service: backup and restore from the cloud and backup and restore to the cloud. With the first option, organizations retain applications and data on their own premise, but back up data to the cloud and restore it to hardware on their own premise when a disaster occurs. With the second option, data is restored to virtual machines in the cloud. For mission-critical applications and resources that must be recovered quickly and completely, the best Schoice is often to replicate data to virtual machines.
Desktops as a service: DaaS is, in essence, an IaaS cloud created solely for hosting and serving virtual desktops. Essentially, it’s pay-as-you-go computing that allows enterprises to quickly provision, access, run and deactivate virtual desktop machines as needed. Organizations can choose to connect through a private network service instead of the public Internet. In most cases, the service provider offers storage for the virtual computers, ensures security and data protection, and controls the network bandwidth to ensure uptime. Most solutions come with a self-service portal for provisioning and multitenant monitoring, reporting and billing. DaaS is a way to make sure that there are always enough desktop environments available to new workers, with enough storage and all the right applications. And because the desktops can be accessed via the Internet, users can log in and access their familiar workspaces from any location.
Servers as a service: Accessing servers in the cloud means that no matter what the project, or even if it’s the busy season, there will always be enough compute power to go around. It’s useful for one-time projects that require additional capacity, or for handling spikes in transactions. And because it’s a service, enterprises can rest assured that they’ll never be paying for more server capacity than they need. Accessing servers as a service also means organizations can cut their IT administrative, maintenance and service workloads. That’s particularly important with servers, which can require complex and expensive system administration. The servers are restricted to secure, private areas dedicated to the organization’s use, so security is ironclad.
Networking as a service: This is the newest entrant in the IaaS category. The idea is to offer networking resources on demand in order to support virtual networks — resources such as firewalls, load balancing and WAN acceleration services. Simply put, NaaS provides unified connectivity across storage, networking and servers that changes to meet the demands of virtualized infrastructures. In some cases, a networking service can support quality of service (QoS) and other network-based auditing and monitoring services. As with other IaaS services, NaaS involves no upfront costs and supports full scalability, flexibility and security.