Distributed Systems useful entire network related things

Distributed System
We Serve Knowledge, with Knowledge
Presented by
Mr. SHANKAR M,
Asst. Professor, CST, MITS
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Definition
A distributed system is a computing environment in which various
components are spread across multiple computers (or other
computing devices) on a network.
Devices split up the work, coordinating their efforts to complete job more
efficiently than if a single device had been responsible for the task.
A distributed system contains multiple nodes that are physically separate but
linked together using the network.
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3
Computer System 2
Computer System 3
Centralized
Computer
System
Computer System 1
Computer System 5
Distributed
System
Software
DB
Computer System 4
Distributed Systems Model

Advantages of Distributed Systems
All the nodes in the distributed system are connected to each
other. So nodes can easily share data with other nodes.
More nodes can easily be added to the distributed system i.e. it
can be scaled as required.
Failure of one node does not lead to the failure of the entire
distributed system. Other nodes can still communicate with each
other.
Resources like printers can be shared with multiple nodes rather
than being restricted to just one.
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Cloud computing
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Cloud computing is a general term for anything that involves
delivering hosted services over the Internet.
“Cloud computing is the use of computing resources (hardware
and software) that are delivered as a service over a network
(typically the Internet).
Distributed and cloud computing systems are built over a large
number of autonomous computer nodes.

Benefits and Deployment Models
Cloud Benefits
Pay as you go
Focus on business rather than IT
Elasticity - Scale up and down based on
business need
Cloud Models
Deployment Models :
Public Cloud, Private Cloud, Hybrid Cloud, Community Cloud
Service Models : SaaS, PaaS, IaaS
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Cloud Computing Services
Infrastructure as a Service (IaaS) - Involves renting IT
infrastructure from a cloud service provider. This may be all
components of the infrastructure (e.g. servers, storage, networks,
etc.)
Platform as a Service (PaaS) - The provision of a complete
software platform, including database, middleware, security,
operating system, development tools, etc. from a service provider.
Software as a Service (SaaS) - This service model is the
complete provision of an application delivered to a
customer/business using a subscription model.
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Essential Characteristics
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On-Demand Self-Service: Allows for provisioning of computing resources automatically as
needed.
Broad Network Access: Access to cloud resources is over the network using standard
mechanisms provided through multi-channels.
Resource Pooling: The vendors’ resources are capable of being pooled to serve multiple
clients using a multi-tenant model, with different physical and virtual resources in a dynamic
way.
Measured Service: Allows monitoring, control and reporting of usage. It also allows for
transparent between the provider and the client.

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Layers and Types of Clouds
Layers or Services of Cloud
Software as a service (SaaS)
Platform as a Service (PaaS)
Infrastructure as a Service (IaaS)
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Application Cloud - Software as a Service (SaaS)
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 “Software as a Service is the hosted delivery of Software that
consumers can access over the internet.” This definition is rather
simplistic.
 By this definition web based email services such as Gmail, Hotmail
etc are SaaS applications.
 Multiple customers share a single instance of the software and the
provider can optimize the resources to suit individual demands.
 Google Apps - a SaaS version of desktop applications where the
software is hosted on google’s servers.
Salesforce - SaaS CRM products.

Platform Cloud – Platform as a Service (PaaS)
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Platform as a Service offers a complete platform and the tools to
develop and deploy applications on the platform.
App Engine is a PaaS offering from Google. Applications are
developed and deployed on Google’s infrastructure.
Force.com is a PaaS offering from Salesforce.
Microsoft Azure is Microsoft’s platform as a service
offering. It provides a range of cloud services, including compute,
analytics, storage and networking.

Infrastructure Cloud – Infrastructure as a service (IaaS)
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Infrastructure as a Service is the hosted delivery of infrastructure services
such as servers, networks and other hardware to consumers.
IaaS provides consumers access to on-demand, scalable storage and
compute power.
Amazon EC2 is an example of IaaS which provides scalable compute
capacity in the cloud. Basically, consumers get a machine that they
customize and use.
Amazon EC2 is an example of hardware as a service.

Types of Cloud
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public cloud
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Infrastructure is located on the premises of a cloud computing
company that offers the cloud service.
The location remains, thus, separate from the customer and he
has no physical control over the infrastructure.
As public clouds use shared resources, they do excel mostly in
performance, but are also most vulnerable to various attacks.

private cloud
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Private clouds are data center architectures owned by a single company
that provides flexibility, scalability, provisioning, automation and
monitoring.
The goal of a private cloud is not sell “as-a-service” offerings to external
customers but instead to gain the benefits of cloud architecture without
giving up the control of maintaining your own data center.

Hybrid cloud
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By using a Hybrid approach, companies can maintain control
of an internally managed private cloud while relying on the
public cloud as needed.
For instance during peak periods individual applications, or
portions of applications can be migrated to the Public Cloud.

Reference/Credit Slide
■ Provide credits/references utilized for the content preparation to avoid
copyrights claims.
■ Title: Distributed Systems: Concepts and Design, Authors: George Coulouris, Jean
Dollimore, Tim Kindberg, Gordon Blair, Edition 5 Publisher: Pearson Education, 2011,
ISBN0133001377, 9780133001372, Length: 1008 pages
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Feedback Slide
■ The attainment of learning outcomes can be measured through Feedback and
Assessment from the learners/viewers/ participants.
Note: If you have any queries/Questions about Distributed Systems, kindly leave your
queries here.
9

THANK
YOU

Distributed Systems useful entire network related things

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