UNIT-1
Introduction to Cloud Computing
Cloud Computing is the combination of Network with Internet. It is a technology which
is manipulating, configuring, and accessing the hardware and software resources remotely. It
offers online data storage, infrastructure, and application. It is the on-demand delivery of IT
resources over the Internet.
Instead of buying, owning, and maintaining
physical data centres and servers, one can
access technology services, such as
computing power, storage, and databases,
on an as-needed basis from a cloud server.
Cloud computing offers platform
independency, that means software is not
required to be installed in a local PC.
In a cloud computing system the Remote
Servers are responsible for running
everything from e-mail to word processing
to complex data analysis programs for the
client users and all the computing process owned by another company.
Cloud can provide services over public and private networks, i.e., WAN, LAN or VPN.
Applications like e-mail, web conferencing, customer relationship management (CRM) executes
on cloud.
Advantages of Cloud Computing
• Back-up and restore data: Once the data is stored in the cloud, it is easier to get back-
up and restore that data using the cloud computing technology.
• Improved collaboration: Cloud applications have improved collaboration by allowing
groups of people to share information in the cloud quickly and easily.
• Excellent accessibility: It allows us to access and store data or information quickly and
easily from anywhere and anytime using internet connection. Ultimately it increases
the productivity and efficiency of the organization.
• Low maintenance cost: Cloud computing reduces both hardware and software
maintenance costs for an organization.
• Mobility: Cloud computing allows us to easily access all cloud data while on roaming.
• Unlimited storage capacity: Cloud offers us a huge amount of storage capacity for
storing our data such as documents, images, audio, video, etc. in one place.
• Data security: Data security is one of the biggest advantages of cloud computing. Cloud
offers many advanced features related to security and ensures that the data is safe.
,Disadvantages of Cloud Computing
• Internet Connectivity: Cloud Server can be accessed only through internet. So if there is
no good internet connectivity or no internet connection, than the data cannot be
accessed properly.
• Vendor lock-in: Vendor lock-in is the biggest disadvantage of cloud computing.
Organizations may face problems when transferring their services from one vendor to
another. As different vendors provide different platforms, that creates a problem to move
data from one cloud to another.
• Limited Control: As we know, cloud infrastructure is completely owned, managed, and
monitored by the service provider, so the cloud users have less control on the cloud
servers.
• Security: Although cloud service providers implement the best security standards, but
before adopting cloud technology, the organization must be aware that they are
handing over all the organization's sensitive information to a third party, which is a
cloud computing service provider. While sending the data on the cloud, there may be a
chance that your organization's information is hacked by Hackers.
Types of Cloud
There are the following 4 types of cloud that
you can deploy according to the
organization's requirements.
Public Cloud
Public cloud is open to all to store and access information through Internet using the pay-per-
usage method. In public cloud, computing resources are managed and operated by the Cloud
Service Provider (CSP).
Example: Amazon elastic compute cloud (EC2), IBM
Smart Cloud Enterprise, Microsoft, Google App
Engine, Windows Azure Services Platform.
Advantages of Public Cloud
o Public cloud is owned at a lower cost than the private and hybrid cloud.
o Public cloud is maintained by the cloud service provider, so do not need to worry
about the maintenance.
o Public cloud is easier to integrate. Hence it offers a better flexibility approach to
consumers.
o Public cloud is location independent because its services are delivered through the
internet.
,Disadvantages of Public Cloud
o Public Cloud is less secure because resources are shared publicly.
o Performance depends upon the high-speed internet network link to the cloud
provider.
o The Client has no control of data.
Private Cloud
Private cloud is also known as an internal
cloud or corporate cloud. It is used by organizations to
build and manage their own data centres internally or
by the third party.
Based on the location and management, National
Institute of Standards and Technology (NIST) divide
private cloud into the following two parts-
o On-premise private cloud
o Outsourced private cloud
Advantages of Private Cloud
o Private cloud provides a high level of security and privacy to the users.
o Private cloud offers better performance with improved speed and space capacity.
o It allows the IT team to quickly allocate and deliver on-demand IT resources.
o The organization has full control over the cloud because it is managed by the
organization itself. So, there is no need for the organization to depends on anybody.
o It is suitable for organizations that require a separate cloud for their personal use and
data security is the first priority.
Disadvantages of Private Cloud
o Skilled people are required to manage and operate cloud services.
o Private cloud is accessible within the organization, so the area of operations is limited.
o Private cloud is not suitable for organizations that have a high user base, and
organizations that do not have the prebuilt infrastructure, sufficient manpower to
maintain and manage the cloud.
, Hybrid Cloud
Hybrid Cloud is a combination of the public cloud
and the private cloud.
It is partially secure because the services which are
running on the public cloud can be accessed by
anyone, while the services which are running on a
private cloud can be accessed only by the
organization's users.
Example: Google Application Suite (Gmail, Google
Apps, and Google Drive), Office 365 (MS Office on the Web and One Drive), Amazon Web
Services.
Advantages of Hybrid Cloud
o Hybrid cloud is suitable for organizations that require more security than the public
cloud.
o Hybrid cloud helps you to deliver new products and services more quickly.
o Hybrid cloud provides an excellent way to reduce the risk.
o Hybrid cloud offers flexible resources because of the public cloud and secure resources
because of the private cloud.
Disadvantages of Hybrid Cloud
o In Hybrid Cloud, security feature is not as good as the private cloud.
o Managing a hybrid cloud is complex because it is difficult to manage more than one
type of deployment model.
o In the hybrid cloud, the reliability of the services depends on cloud service providers.
Community Cloud
Community cloud allows systems and
services to be accessible by a group of several
organizations to share the information
between the organization and a specific
community. It is owned, managed, and
operated by one or more organizations in the
community, a third party, or a combination
of them.
Example: Health Care community cloud
Introduction to Cloud Computing
Cloud Computing is the combination of Network with Internet. It is a technology which
is manipulating, configuring, and accessing the hardware and software resources remotely. It
offers online data storage, infrastructure, and application. It is the on-demand delivery of IT
resources over the Internet.
Instead of buying, owning, and maintaining
physical data centres and servers, one can
access technology services, such as
computing power, storage, and databases,
on an as-needed basis from a cloud server.
Cloud computing offers platform
independency, that means software is not
required to be installed in a local PC.
In a cloud computing system the Remote
Servers are responsible for running
everything from e-mail to word processing
to complex data analysis programs for the
client users and all the computing process owned by another company.
Cloud can provide services over public and private networks, i.e., WAN, LAN or VPN.
Applications like e-mail, web conferencing, customer relationship management (CRM) executes
on cloud.
Advantages of Cloud Computing
• Back-up and restore data: Once the data is stored in the cloud, it is easier to get back-
up and restore that data using the cloud computing technology.
• Improved collaboration: Cloud applications have improved collaboration by allowing
groups of people to share information in the cloud quickly and easily.
• Excellent accessibility: It allows us to access and store data or information quickly and
easily from anywhere and anytime using internet connection. Ultimately it increases
the productivity and efficiency of the organization.
• Low maintenance cost: Cloud computing reduces both hardware and software
maintenance costs for an organization.
• Mobility: Cloud computing allows us to easily access all cloud data while on roaming.
• Unlimited storage capacity: Cloud offers us a huge amount of storage capacity for
storing our data such as documents, images, audio, video, etc. in one place.
• Data security: Data security is one of the biggest advantages of cloud computing. Cloud
offers many advanced features related to security and ensures that the data is safe.
,Disadvantages of Cloud Computing
• Internet Connectivity: Cloud Server can be accessed only through internet. So if there is
no good internet connectivity or no internet connection, than the data cannot be
accessed properly.
• Vendor lock-in: Vendor lock-in is the biggest disadvantage of cloud computing.
Organizations may face problems when transferring their services from one vendor to
another. As different vendors provide different platforms, that creates a problem to move
data from one cloud to another.
• Limited Control: As we know, cloud infrastructure is completely owned, managed, and
monitored by the service provider, so the cloud users have less control on the cloud
servers.
• Security: Although cloud service providers implement the best security standards, but
before adopting cloud technology, the organization must be aware that they are
handing over all the organization's sensitive information to a third party, which is a
cloud computing service provider. While sending the data on the cloud, there may be a
chance that your organization's information is hacked by Hackers.
Types of Cloud
There are the following 4 types of cloud that
you can deploy according to the
organization's requirements.
Public Cloud
Public cloud is open to all to store and access information through Internet using the pay-per-
usage method. In public cloud, computing resources are managed and operated by the Cloud
Service Provider (CSP).
Example: Amazon elastic compute cloud (EC2), IBM
Smart Cloud Enterprise, Microsoft, Google App
Engine, Windows Azure Services Platform.
Advantages of Public Cloud
o Public cloud is owned at a lower cost than the private and hybrid cloud.
o Public cloud is maintained by the cloud service provider, so do not need to worry
about the maintenance.
o Public cloud is easier to integrate. Hence it offers a better flexibility approach to
consumers.
o Public cloud is location independent because its services are delivered through the
internet.
,Disadvantages of Public Cloud
o Public Cloud is less secure because resources are shared publicly.
o Performance depends upon the high-speed internet network link to the cloud
provider.
o The Client has no control of data.
Private Cloud
Private cloud is also known as an internal
cloud or corporate cloud. It is used by organizations to
build and manage their own data centres internally or
by the third party.
Based on the location and management, National
Institute of Standards and Technology (NIST) divide
private cloud into the following two parts-
o On-premise private cloud
o Outsourced private cloud
Advantages of Private Cloud
o Private cloud provides a high level of security and privacy to the users.
o Private cloud offers better performance with improved speed and space capacity.
o It allows the IT team to quickly allocate and deliver on-demand IT resources.
o The organization has full control over the cloud because it is managed by the
organization itself. So, there is no need for the organization to depends on anybody.
o It is suitable for organizations that require a separate cloud for their personal use and
data security is the first priority.
Disadvantages of Private Cloud
o Skilled people are required to manage and operate cloud services.
o Private cloud is accessible within the organization, so the area of operations is limited.
o Private cloud is not suitable for organizations that have a high user base, and
organizations that do not have the prebuilt infrastructure, sufficient manpower to
maintain and manage the cloud.
, Hybrid Cloud
Hybrid Cloud is a combination of the public cloud
and the private cloud.
It is partially secure because the services which are
running on the public cloud can be accessed by
anyone, while the services which are running on a
private cloud can be accessed only by the
organization's users.
Example: Google Application Suite (Gmail, Google
Apps, and Google Drive), Office 365 (MS Office on the Web and One Drive), Amazon Web
Services.
Advantages of Hybrid Cloud
o Hybrid cloud is suitable for organizations that require more security than the public
cloud.
o Hybrid cloud helps you to deliver new products and services more quickly.
o Hybrid cloud provides an excellent way to reduce the risk.
o Hybrid cloud offers flexible resources because of the public cloud and secure resources
because of the private cloud.
Disadvantages of Hybrid Cloud
o In Hybrid Cloud, security feature is not as good as the private cloud.
o Managing a hybrid cloud is complex because it is difficult to manage more than one
type of deployment model.
o In the hybrid cloud, the reliability of the services depends on cloud service providers.
Community Cloud
Community cloud allows systems and
services to be accessible by a group of several
organizations to share the information
between the organization and a specific
community. It is owned, managed, and
operated by one or more organizations in the
community, a third party, or a combination
of them.
Example: Health Care community cloud
