1 CHEM-E Process Automation and Information Systems: Applications Cloud computing Jukka Kortela
2 Contents What is Cloud Computing? Overview of Cloud Computing Comparison of Cloud Deployment Models Comparison of Cloud Service Delivery Models
3 Introduction Cloud Service Delivery Models There are three primary service delivery models associated with cloud computing: Software as a Service (SaaS) Platform as a Service (PaaS) or Infrastructure as a Service (IaaS)
4 The Cloud Service Delivery models
5 Introduction to Cloud Deployment Models There are four deployment models for a cloud platform Private Community Public Hybrid
6 Cloud categories
7 Cloud Subscription Model Cloud computing can be described as a utility service, which is offered under a subscription and pay-as-you-go model like electricity is obtained from a public or private utility, cloud computing enables organizations or individuals to obtain computing services on a pay-as-you-go model. Using the utility analogy, Cloud Computing is analogous to purchasing only the power that you use from your electric utility, whereas Traditional IT On-Premise Computing is analogous to purchasing or leasing property, purchasing power generators, running electric lines from the generators to your company, hiring staff to maintain the facility, and then paying for the electricity even when your business is closed.
8 Differences between the Cloud Model and Traditional IT On-Premise Model
9 Basic Cloud Capabilities The Cloud provides the following basic capabilities: On-demand self-service Broad network access Resource pooling Rapid elasticity Measured service
10 Advantages and Disadvantages of Cloud Computing The advantages to cloud computing including Ease of use and upgrades Low capital expenditure Remote access capabilities from several locations Higher security/better data recovery Optimized use of resources Improved agility to respond to business changes The disadvantages to cloud computing including Network interruptions Downtime Data security Privacy
11 Advantages and Disadvantages of Cloud Computing
12 Cloud Deployment Models The most common deployment models Public Private Hybrid
13 Public Cloud 1/3 In a public cloud deployment model, a cloud provider has services available for consumption by the general public. These services exist on infrastructure owned by the cloud provider, which may be a private entity such as a business or non-profit, or a public entity such as a government or academic institution. Benefits Pay-as-you-go Low initial cost Very elastic
14 Public Cloud 2/3 The cloud provider handles managing all aspects of its infrastructure, thus eliminating the need for individual companies to need to worry about any of the following infrastructure-related costs Data Center Facilities Telecommunications lines Computer, storage, and networking equipment IT staffing such as: data center technicians, network engineers, storage engineers, server engineers, systems administrators, network operations, and layers of management
15 Public Cloud 3/3 A variety of organizations benefit from the availability of Public Cloud infrastructure. Amazon Web Services (AWS) and Microsoft Azure are examples of public cloud providers for both Infrastructure as a Service (IaaS) and Platform as a Service (PaaS). Salesforce and Oracle are examples of public cloud providers for Software as a Service (SaaS) in the enterprise applications space Dropbox, icloud, and Google Docs are examples of public cloud providers for Software as a Service (SaaS) in the consumer and small business applications space.
16 Advantages The provider offers both hardware and software resources that the customer needs on a pay-as-you-go model. The customer is able to benefit from the automated manner in which resources are allocated and deallocated. The only requirement for the customer is the availability of a high speed internet connection.
17 Disadvantages Customers feel that lack of control over the hardware, combined with the possibility of someone else accessing their data is a cause for concern. Since access to the public cloud is via an internet connection, customers are limited to the speed that they get through their ISP. Sometimes customers feel that they are locked in to a cloud service because the cost of moving to a different provider is high due to lack of standards.
18 Private Cloud 1/3 In a private cloud deployment model, an internal department (typically called IT) has services available for consumption by other organizations within a larger organization. These services exist on infrastructure owned by the organization, which may be a private entity such as a business or non-profit, or a public entity such as a government or academic institution. Benefits Complete control over implementation and management Completely customizable Security
19 Private Cloud 2/3 The department running the private cloud handles managing all aspects of its infrastructure, thus eliminating the need for individual organizations to need to worry about any of the following infrastructure-related costs Data Center Facilities Telecommunications lines Computer, storage, and networking equipment IT staffing such as: data center technicians, network engineers, storage engineers, server engineers, systems administrators, network operations, and layers of management
20 Private Cloud 3/3 A variety of organizations benefit from the availability of Private Cloud infrastructure. OpenStack and Apache CloudStack are examples of open-source private cloud solutions whereas vcloud and Microsoft Private Cloud are examples of commercial private cloud solutions for Infrastructure as a Service (IaaS)
21 Private Cloud In a typical private cloud the organization hosts the cloud in one of their data centers behind the corporate firewall. The second type of private cloud is one that is managed by a third party provider. In this case the organization still owns the infrastructure in one of their data centers but management of the facility is with a third party. In the third model, the hosted private cloud, a cloud service provider provides the infrastructure needed and manages that infrastructure. The fourth model is the Virtual Private Cloud (VPC). The VPC service is offered by a traditional cloud service provider in a multi-tenant environment.
22 Hybrid Cloud In a hybrid cloud deployment model, an organization uses both public and private cloud solutions and implements management frameworks to enable workload interoperability. Benefits Elasticity to meet peak workloads Internal IT staff can manage both environments at different levels to meet business needs Workloads can be moved to the appropriate cloud platform based on the organization's criteria Low risk without sacrificing agility
23 Hybrid Cloud The hybrid model uses both proprietary computing resources that the organization manages directly and the public cloud for some of the computing requirements, especially the ones with varying demands on resources the hybrid cloud offers the cloud advantages of scalability, availability, demand elasticity and pay-asyou-go model.
24 Cloud Service Delivery Models 1/7 Software as a Service (SaaS) Delivery model where a cloud provider is providing software for consumption via the Internet. Although this service delivery model is most commonly delivered via a Public Cloud deployment, it could be delivered via a Private Cloud or Hybrid Cloud as well. The SaaS model enables a cloud provider to provide a piece of software via the Internet, using either web browsers or native client applications, such as for mobile devices or a PC. If a client application is used, it is most likely a thin client and generally connects to a backend application programming interface (API) over HTTPS for much or all of the application functionality. SaaS software is very common for enterprise, small business, and consumer software, and many large software companies now offer their applications under a SaaS delivery model.
25 Cloud Service Delivery Models 2/7 Examples of Software as a Service (SaaS)
26 Cloud Service Delivery Models 3/7 Platform as a Service (PaaS) In a Platform as a Service (PaaS) delivery model, a cloud provider is providing a platform for customers to develop, run, and manage software applications without needing to worry about the infrastructure that normally would be required. PaaS is provided for consumption via the Internet. Although this service delivery model is most commonly delivered via a Public Cloud deployment, it could be delivered via a Private Cloud or Hybrid Cloud as well
27 Cloud Service Delivery Models 4/7 The PaaS model enables a cloud provider to provide a platform that can be used for rapid application development via the Internet. A company can develop and deploy an application much faster on the PaaS model, because the PaaS provider manages a significant portion of the technology stack, thus freeing the developer to focus on the application itself. Examples of PaaS Heroku Amazon AWS RedHat OpenShift Google App Engine
28 Cloud Service Delivery Models 5/7 Infrastructure as a Service (IaaS) In the Infrastructure as a Service (IaaS) delivery model, a cloud provider is providing infrastructure for consumption via the Internet. This service delivery model is delivered via Public, Private, Hybrid, and Community Cloud deployment models. The IaaS model enables a cloud provider to provide a complete infrastructure via the Internet, and enables companies to eliminate the need to maintain their own IT infrastructure such as data centers, hardware, and telecommunications links. Companies such as Netflix use public IaaS providers like Amazon Web Services (AWS)
29 Cloud Service Delivery Models 6/7 Infrastructure as a Service (IaaS) IaaS models enable even the smallest organizations with very small IT budgets to offer a robust infrastructure for customers, which was not possible previously. IaaS enables organizations to rapidly deploy new applications/services, migrate existing services out of on-premise data centers, and introduce automation technologies to improve service delivery.
30 Cloud Service Delivery Models 7/7 Other Cloud Service Delivery Models (XaaS) In addition there are cloud service delivery models, which are often referred to as Everything as a Service such as: XaaS, *aas, or EaaS. Everything as a Service is simply referring to being able to provide and use fine-grained and reusable components over the Internet. Some examples include: Database as a Service (DBaaS) Communications as a Service (CaaS) Mobile Applications as a Service (MAaaS)
31 Contents Virtualization Technologies Overview of Virtualization Virtualization in the Cloud
32 Cloud platforms utilize virtualization 1/3 Virtualization is a technique allowing computers to effectively emulate other computers as well as various hardware devices. Virtualization was developed in the 1960s to provide compatibility between computer mainframes and it has evolved into today s modern version where a standard server machine (host) can emulate multiple machines of various types and sizes. The software which allows virtualization is called hypervisor. The emulated machines are called virtual machines or virtual servers.
33 Cloud platforms utilize virtualization 2/3 Hypervisor can run directly on the server s hardware substituting for the host s operating system, and each virtual server running its own operating system and applications Alternatively, it can run on top of the host s native operating system taking advantage of its features but inserting an extra layer in the software stack.
34 Cloud platforms utilize virtualization 3/3 Virtualization allows for software emulation of all kinds of hardware devices. It enables creation of software defined environments in which various components of computer systems can be virtualized. It is one of the main enabling technologies of cloud computing. An important fact about virtualization is that virtual components, defined and run by the software, can be programmatically provisioned and controlled, allowing for high level of automation of the cloud.
35 Data Center Infrastructure 1/2 In a Cloud environment, the data center infrastructure is abstracted from the consumer's view. Systems such as power, cooling, computer hardware, storage hardware, and network hardware are invisible to the consumer. These cloud data centers are large buildings, located with access to multiple power supplies, and located in areas with significant networking capacity. The infrastructure of these facilities employs standardized layouts for equipment racks, networking equipment, power supplies, and cooling.
36 Data Center Infrastructure 2/2 The diagrams below show both a traditional IT on-premise data center and a cloud data center (a IaaS service delivery model), and who is responsible for components in each.
37 Cloud Compute Cloud compute refers to a variety of server resources where an application workload may run, such as: virtualized, containers, or bare-metal. In a cloud model, these compute resources may span many physical devices and locations. In addition, these compute resources are provisioned programmatically.
38 Cloud Storage Cloud storage refers to a model where data is stored in logical storage pools, spanning many physical devices and locations. A consumer of a cloud storage service does not have any visibility or control over where their data is stored.
39 Software Defined Networking Software Defined Networking (SDN) is a set of techniques to create abstract interfaces to networking protocols and hardware devices, and implement them in software so that networks for virtual resources in the cloud can be programmatically created, configured, maintained, and controlled. In Software Defined Networking: the network infrastructure control function is separated from the lowlevel implementation using dynamic, cost-effective, and programmatically manageable methods. To gain a better understanding of Software Defined Networking, first let s look at an example of a traditional network.
40 Traditional network In a traditional network, devices are connected to one another by physical or wireless connections and therefore physical network devices such as switches, routers, and hubs are required. As virtualization became more prevalent in the 2000's, simple hybrid networks entered the picture as depicted here.
41 Simple Hybrid network In the simple hybrid network, a virtual switch and virtual machines have been added to a traditional network. This is an acceptable network configuration for simple networks, but became insufficient as the industry has shifted towards a cloud computing model with much larger virtualized networks. With the shift to cloud computing, software defined networks have grown in popularity.
42 Software Defined networks (SDN) A two-layer Software Defined Network (SDN) is depicted in the diagram above with control and infrastructure layers. The number of layers is an implementation detail, and may be further separated beyond what is depicted in the diagram above. The important characteristic of SDN is that network behavior can be programmed as a software configuration.
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