Lecture-02: Types of Cloud Computing (CC)

 Types of Cloud Computing

The following are the types of cloud also known as cloud deployment models as follows:

1.    Public cloud

2.    Private cloud

3.    Hybrid cloud

4.    Community cloud

5.    Multicloud

1. Public Cloud

• Public clouds are managed by third parties which provide cloud services over the internet to the public, these services are available as pay-as-you-go billing models. 

• They offer solutions for minimizing IT infrastructure costs and become a good option for handling peak loads on the local infrastructure. Public clouds are the go-to option for small enterprises, which can start their businesses without large upfront investments by completely relying on public infrastructure for their IT needs. 

• The fundamental characteristics of public clouds are multitenancy. A public cloud is meant to serve multiple users, not a single customer. A user requires a virtual computing environment that is separated, and most likely isolated, from other users. 

Examples: Amazon EC2(Elastic Compute Cloud ), IBM, Azure, GCP

                                                                     Figure: Public Cloud

Advantages of Public Cloud

The following are the advantages of public cloud:

• Public cloud is easily able to scale up and down resources as per the demand of traffic and workload. It facilitates with performance optimization and cost efficiency.

• It works on pay-as-you-go cloud model and helps in resolving the investments needs in hardware and infrastructure reducing overall costs.

Disadvantages of using Public Cloud

The following are the disadvantages of Public Cloud:

• It is difficult to trust and maintain data to a third-party provider may raise concerns about control and ownership

• The shared infrastructure of public cloud resources increases the risk of data breaches and unauthorized access. It raises security and privacy concerns.

• Public cloud comes with limited transparency about the underlying infrastructure which may make it challenging to monitor and manage performance effectively.

 

2. Private Cloud

• Private clouds are distributed systems that work on private infrastructure and provide the users with dynamic provisioning of computing resources. Instead of a pay-as-you-go model in private clouds, there could be other schemes that manage the usage of the cloud and proportionally billing of the different departments or sections of an enterprise. Private cloud providers are HP Data Centers, Ubuntu, Elastic-Private cloud, Microsoft, etc.
• Resources are deployed for one particular organization. This method is more used for intra-business interactions. Computing resources can be governed, owned and operated by the same organization.

Examples: VMware vCloud Suite, OpenStack, Cisco Secure Cloud, Dell Cloud Solutions, HP Helion Eucalyptus.

                                                     Figure: Private Cloud

Advantages Of Private Cloud

• Customer information protection: In the private cloud security concerns are less since customer data and other sensitive information do not flow out of private infrastructure.

• Infrastructure ensuring Service Level Agreements (SLAs): Private cloud provides specific operations such as appropriate clustering, data replication, system monitoring, and maintenance, disaster recovery, and other uptime services.

• Compliance with standard procedures and operations: Specific procedures have to be put in place when deploying and executing applications according to third-party compliance standards. This is not possible in the case of the public cloud.

 

Disadvantages Of Private Cloud

• The restricted area of operations: Private cloud is accessible within a particular area. So the area of accessibility is restricted.

• Expertise requires:  In the private cloud security concerns are less since customer data and other sensitive information do not flow out of private infrastructure. Hence skilled people are required to manage & operate cloud services.

 

3. Hybrid cloud

• A hybrid cloud is a heterogeneous distributed system formed by combining facilities of the public cloud and private cloud. For this reason, they are also called heterogeneous clouds. 

• A major drawback of private deployments is the inability to scale on-demand and efficiently address peak loads. Here public clouds are needed. Hence, a hybrid cloud takes advantage of both public and private clouds. 

• Examples: AWS Outposts, Azure Stack, Google Anthos, IBM Cloud Satellite, Oracle Cloud at Customer.

                                                           Figure: Hybrid Cloud

Benefits of Hybrid Cloud Computing

The following are the advantages of using Hybrid Cloud:

• Hybrid cloud is available at a cheap cost than other clouds because it is formed by a distributed system.

• It works comes up with working fast with lower cost and facilitates in reducing the latency of the data transfer process.

• Most important thing is security. A hybrid cloud is totally safe and secure because it works on the distributed system network.

 

Disadvantages of Using Hybrid Cloud

The following are the disadvantages of using Hybrid Cloud:

• It's possible that businesses lack the internal knowledge necessary to create such a hybrid environment. Managing security may also be more challenging. Different access levels and security considerations may apply in each environment.

• Managing a hybrid cloud may be more difficult. With all of the alternatives and choices available today, not to mention the new PaaS components and technologies that will be released every day going forward, public cloud and migration to public cloud are already complicated enough. It could just feel like a step too far to include hybrid.

4. Community Cloud

• Community clouds are distributed systems created by integrating the services of different clouds to address the specific needs of an industry, a community, or a business sector. But sharing responsibilities among the organizations is difficult.

• In the community cloud, the infrastructure is shared between organizations that have shared concerns or tasks. An organization or a third party may manage the cloud. 

• Examples: CloudSigma, Nextcloud, Synology C2, OwnCloud, Stratoscale

                                                  Figure: Community Cloud

Advantages of Using Community Cloud

The following are the advantages of using Community Cloud:

• Because the entire cloud is shared by numerous enterprises or a community, community clouds are cost-effective.

• Because it works with every user, the community cloud is adaptable and scalable. Users can alter the documents according to their needs and requirements.

• Public cloud is less secure than the community cloud, which is more secure than private cloud.

• Thanks to community clouds, we may share cloud resources, infrastructure, and other capabilities between different enterprises.

Disadvantages of using Community Cloud

The following are the disadvantages of using Community Cloud:

• Not all businesses should choose community cloud.

• Gradual adoption of data

• It's challenging for corporations to share duties.