1. The document discusses different cloud deployment models including private, public, community, and hybrid clouds. 2. Private clouds can be either on-premise or outsourced to a third party, and provide a high level of security but have constraints around budget and SLAs. 3. Public clouds are highly scalable and affordable but have challenges around security, data privacy, and organizational autonomy.

1. Cloud Deployment
Model
Yong Heui Cho @ Mokwon University
Some of slides are referred to and all credits should go to:
[1] K. Chandrasekaran, Essentials of Cloud Conputing, CRC Press, 2015.

2. 2
Cloud Service
5. Node.js Applications
6. Cloud Computing Architecture
7. Cloud Deployment Model
9. Cloud Service Model

3. 3
Cloud Deployment Model

4. 4
Private Cloud Characters
• Secure
– Least chance of data being leaked out of the
cloud
• Central control
– The organization mostly has full control over
the cloud.
• Weak SLA

5. 5
On-premise Private Cloud
• A typical private cloud managed by a
single organization

6. 6
On-premise Private Cloud
Issues (I)
• SLA: organization and users
• Network
– Cloud is totally dependent on the network.
– High bandwidth and low latency
• Performance: network and resources
• Security and data privacy
– Easy to control
– Resistant to attacks

7. 7
On-premise Private Cloud
Issues (II)
• Location: data are internal.
• Cloud management
– Resource scheduling, resource provisioning,
and resource management
• Multitenancy
– Hard chance of unwanted access
• Maintenance: easier

8. 8
Outsourced Private Cloud
• Cloud outsourced to a third party that
manages the whole cloud.

9. 9
Outsourced Private Cloud
Issues (I)
• SLA: strict with the third party
• Network: usually connected with
Internet
• Security and privacy
– The outsourced cloud is less secure.
• Laws and conflicts: when deployed
outside the country

10. 10
Outsourced Private Cloud
Issues (II)
• Location: outside the organization
• Performance: depends on the third
party
• Maintenance: maintained by the third
party

11. 11
Pros and Cons of Private
Cloud
Pros Cons
• The cloud is small in size
and is easy to maintain.
• It provides a high level of
security and privacy to
the user.
• It is controlled by the
organization.
• For the private
cloud, budget
is a constraint.
• The private
clouds have
loose SLAs.

12. 12
Public Cloud
• Public cloud providers usually accept all
requests, and hence the resources are
almost infinite.

13. 13
Public Cloud Characters
• Highly scalable: the resources are large
enough for requests.
• Affordable: pay-as-you-go basis
• Less secure: though the SLA ensures
privacy.
• Highly available: anywhere and anytime
with proper permission
• Stringent SLA

14. 14
Suitability of Public Cloud
Suitable Not suitable
• The requirement for
resources is large.
• The requirement for
resources is varying.
• There is no physical
infrastructure available.
• An organization has
financial constraints.
• Security is very
important.
• Organization
expects
autonomy.
• Third-party
reliability is not
preferred.

15. 15
Public Cloud Issues (I)
• SLA: guarantees all the users a fair share
without any priority.
• Network: plays a major role in the public
cloud.
• Performance: network and resources
• Multitenancy: a high risk of data being
leaked
• Location: important issue

16. 16
Public Cloud Issues (II)
• Security and data privacy: the biggest
challenges
• Laws and conflicts: data in different
countries
• Cloud management: related to SLA
• Maintenance: very crucial

17. 17
Pros and Cons of Public Cloud
Pros
• There is no need of establishing infrastructure for setting
up a cloud.
• There is no need for maintaining the cloud.
• They are comparatively less costly than other cloud
models.
• Strict SLAs are followed.
• There is no limit for the number of users.
• The public cloud is highly scalable.
Cons
• Security is an issue.
• Privacy and organizational autonomy are not possible.

18. 18
Community Cloud
• Cloud infrastructure that is provisioned for
exclusive use by a specific community of
consumers from organizations that have
shared concerns

19. 19
Suitability of Community
Cloud
Suitable
• Want to establish a private cloud but have financial
constraint
• Do not want to complete maintenance responsibility of
the cloud
• Want to establish the cloud in order to collaborate with
other clouds
• Want to have a collaborative cloud with more security
features than the public cloud
Not suitable
• Prefer autonomy and control over the cloud
• Does not want to collaborate with other organizations

20. 20
Pros and Cons of
Community Cloud
Pros Cons
• It allows establishing a low-
cost private cloud.
• It allows collaborative work
on the cloud.
• It allows sharing of
responsibilities among the
organization.
• It has better security than
the public cloud.
• Autonomy of an
organization is lost.
• Security features
are not as good as
the private cloud.
• It is not suitable if
there is no
collaboration.

21. 21
Hybrid Cloud
• Cloud infrastructure that is a composition
of two or more distinct cloud
infrastructures

22. 22
Suitability of Hybrid Cloud
Suitable Not suitable
• Organizations that
want the private
cloud environment
with the scalability of
the public cloud
• Organizations that
require more security
than the public cloud
• Organizations that
consider security as
a prime objective
• Organizations that
will not be able to
handle hybrid cloud
management

23. 23
Pros and Cons of Hybrid
Cloud
Pros Cons
• It gives the power of
both the private and
public clouds.
• It is highly scalable.
• It provides better
security than the public
cloud.
• The security features
are not as good as
the public cloud.
• Managing a hybrid
cloud is complex.
• It has stringent SLAs.