Why Cloud Computing Was Needed Let s start with the expenditure or the billing model With cloud the billing model is pay as you go type meaning we use less and pay less and we use more and we pay less per unit On the other hand in on premises we can t expect that we pay everything upfront and there is an additional operating cost and it never lets us dynamically scale In the on premises environment a lot of space is required for seating the servers but in the cloud not such space requirement is needed for the organization In on premises we also need a dedicated team to manage the hardware and software but in the cloud no such dedicated team is needed for most of the services they all get managed by the provider and even if we need to manage them the provider gives us options to manage them through the console which is lot simpler than managing directly from the device In the on premises environment data security is poor due to the cost involved in procuring the hardware and software to provide the security but in the cloud the security standards are high due to the investments the providers have done to secure the data and to meet the compliance In traditional DC there will generally be less focus on data recovery and we kind of settle for less when it comes to data recovery due to the cost involved and the effort involved in replicating the data and even if we set up a high performing data replication a lot more can be done in the cloud for the same cost The on premises environment lacks the flexibility needed today like if I need to restructure the IT for the new age business needs then the on premises is not so friendly for such changes but in the cloud i can easily undo or tear down an environment or migrate to the new environment and tear down the old environment in few button clicks now looking at the number and the frequency of the releases that happen scheduling updates would be an fulltime job but with cloud the updates happen automatically in on premises if i m working with the team that is across the globe working with them in unison and sharing the data is a tedious work but with the cloud there are a lot of tools and technologies put together that makes it easy to share the data with other members in the team or with the new prospective customer What is Cloud Computing Cloud Computing is the ability to deliver on demand computing service over the internet and that too on a pay as you go basis With cloud rather than managing files on local storage devices cloud computing makes it possible to save them over the internet and access them from the internet So I can be a mobile person and I m moving from place to place but I can access the storage from the internet because it s in the internet and if I want to give access to somebody else again it s easy for me to give access to them as long as they have internet connection available with them shows that the resources managed by users decrease as we move from on premises to SaaS Deployment Models Public Cloud This cloud infrastructure is made available to the general public over the internet and is owned by the cloud provider Major players in this category include AWS Microsoft Azure IBM s Blue Cloud and Sun Cloud Private Cloud This cloud infrastructure is exclusively operated by a single organization either managed by the organization or a third party Some companies providing private cloud services include AWS and VMware Hybrid Cloud This cloud infrastructure provides the best of both public and private clouds For example federal agencies use private clouds for storing and developing personal data and use public clouds to share nonsensitive data with the general public or other government departments Service Models Cloud services can be categorized as infrastructure as a service IaaS platform as a service PaaS or software as a service SaaS IaaS IaaS provides basic computing infrastructure based on a pay for what you use model Some major players in this category include AWS Azure and Google PaaS PaaS provides a platform or runtime environment for developing testing and managing applications without running the underlying infrastructure PaaS is commonly used by software developers SaaS SaaS provides a finished product hosted in the cloud managed by the vendor Users pay for the service through a pay as you go subscription model SaaS is commonly used by end customers Comparison of cloud service models Different Cloud Providers There are various cloud providers offering cloud computing services including AWS A cloud computing service provided by Amazon that provides a mix of IaaS PaaS and SaaS offerings Microsoft Azure A cloud computing service by Microsoft that specializes in using cloud for building testing deploying and managing applications through the servers throughout the global network that Microsoft manages It provides IaaS PaaS and SaaS offerings and supports various programming languages and tools IBM Cloud A cloud computing service offered by IBM that includes IaaS PaaS and SaaS offerings through public private and hybrid cloud delivery models VMware A subsidiary of Dell Technologies that provides cloud computing and platform virtualization software and services Google Cloud Platform A suite of cloud computing services offered by Google that provides computing services data storage services data analytics and machine learning services DigitalOcean computing service headquartered in New York City that provides developers cloud services to deploy and scale applications that run simultaneously on multiple computers Cloud Computing in AWS AWS provides infrastructure as a service IaaS offerings allowing users to create and deploy any type of application in the cloud on top of the infrastructure provided by Amazon Subscriptions are pay as you go meaning users only pay for what they have used Life Cycle of a Cloud Computing Solution The life cycle of a cloud computing solution involves Getting a proper understanding of the requirement Defining the hardware Choosing the compute servers that will provide the right support Getting a sound understanding of the requirement is vital in picking the right service offered by the provider Different services and hardwares are available for different needs