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Following on the heels of SaaS, Platform as a Service (PaaS) is another application delivery model PaaS supplies all the resources required to build applications and services completely from the Internet, without having to download or install software
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Part I:
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Getting Started
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NOTE PaaS is also known as cloudware
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Service provider offering PaaS PaaS allows clients to access a computing platform over a cloud computing solution
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PaaS services include application design, development, testing, deployment, and hosting Other services include team collaboration, web service integration, database integration, security, scalability, storage, state management, and versioning A downfall to PaaS is a lack of interoperability and portability among providers That is, if you create an application with one cloud provider and decide to move to another provider, you may not be able to do so or you ll have to pay a high price Also, if the provider goes out of business, your applications and your data will be lost
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NOTE This was the case with the provider Zimki The company started in 2006 and by mid-2007
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was out of business, causing applications and client data they hosted to be lost PaaS generally offers some support to help the creation of user interfaces, and is normally based on HTML or JavaScript Because PaaS is expected to be used by many users simultaneously, it is designed with that sort of use in mind, and generally provides automatic facilities for concurrency management, scalability, failover, and security PaaS also supports web development interfaces such as Simple Object Access Protocol (SOAP) and Representational State Transfer (REST), which allow the construction of multiple web services, sometimes called mashups The interfaces are also able to access databases and reuse services that are within a private network
PaaS Options
PaaS is found in one of three different types of systems:
Add-on development facilities These allow existing SaaS applications to be customized Often, PaaS developers and users are required to purchase subscriptions to the add-on SaaS application Stand-alone environments These environments do not include licensing, technical, or financial dependencies on specific SaaS applications and are used for general developments
1:
Cloud Computing Basics
Application delivery-only environments These environments support hostinglevel services, like security and on-demand scalability They do not include development, debugging, and test capabilities
PART I PART I PART I
Trends Toward Adoption PaaS faces the same sorts of factors in its adoption as SaaS did, as it is in its early phase Some other factors influencing adoption include
The ability of geographically isolated development teams to work together The ability to merge web services from multiple sources The ability to realize cost savings from using built-in infrastructure services for security, scalability, and failover, rather than having to obtain and test them separately The ability to realize cost savings from using higher-level programming abstractions Because vendors use proprietary services or development languages, some developers are afraid of being locked into a single provider The vendor may allow the application to be brought to a different provider; however, the costs are typically higher as compared to moving applications between conventional hosts
Hurdles There are two main obstacles that developers face when considering PaaS
Hardware as a Service
Hardware as a Service (HaaS) is the next form of service available in cloud computing Where SaaS and PaaS are providing applications to customers, HaaS doesn t It simply offers the hardware so that your organization can put whatever they want onto it
NOTE HaaS is sometimes also called Infrastructure as a Service (IaaS)
Internet
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Memory Storage Service provider offering HaaS HaaS allows service providers to rent hardware resources
Clients
Rather than purchase servers, software, racks, and having to pay for the datacenter space for them, the service provider rents those resources
Part I:
Getting Started
HaaS allows you to rent such resources as Server space Network equipment Memory CPU cycles Storage space Additionally, the infrastructure can be dynamically scaled up or down, based on the application resource needs Further, multiple tenants can be on the equipment at the same time Resources are typically billed based on a utility computing basis, so providers charge by how many resources are consumed HaaS involves several pieces: Service level agreements This is an agreement between the provider and client, guaranteeing a certain level of performance from the system Computer hardware These are the components whose resources will be rented out Service providers often have this set up as a grid for easier scalability Network This includes hardware for firewalls, routers, load balancing, and so on This allows clients to access the hardware from their own This allows the clients to run the virtual Internet connectivity organizations
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