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This article mainly introduces what is the difference between private cloud and public cloud in computer network. It is very detailed and has certain reference value. Interested friends must finish reading it.

Differences: 1. Public cloud is a cloud computing service published on the Internet, and the resources for building a cloud are in the provider's location; private cloud is a cloud service released within an enterprise, and the resources needed to build a cloud platform are self-sufficient by the enterprise. 2. The public cloud is built for the individual use of "one" customer; the public cloud is aimed at external customers and provides scalable and flexible services through the network.

In the current popularity of cloud computing, many enterprises migrate their data and information to the cloud. But in the face of a wide variety of cloud services, how should enterprises choose the business that suits them? First of all, we need to understand what cloud computing is, there are several models of cloud computing, the architecture principles of various models.

What is cloud computing? cloud computing delivers computing to users as a service rather than a product, in which computing resources, software and information are delivered to computers and other computing media through the Internet like daily water and electricity.

Three modes of Cloud Computing

According to the business model, cloud computing can be divided into three main categories: public cloud, private cloud and hybrid cloud. These three models form the basis for cloud infrastructure construction and consumption.

Here, we analyze the public cloud, private cloud and hybrid cloud one by one to help you understand these cloud products better, and choose cloud services that are more suitable for you.

1. Public Cloud (PublicClouds)

"Public ownership" reflects that such cloud services are not owned by users, and public clouds are services that provide computing resources to the public. Resources, such as applications and storage, are provided by IDC service providers or third parties, and these resources are deployed in the service provider's premises. Users obtain the use of these resources through the Internet Internet. Public cloud service providers include Amazon, Google and Microsoft, as well as domestic Aliyun and Tencent Cloud.

The advantage of public cloud is its low cost and good scalability. The disadvantages are lack of control over cloud resources, security of confidential data, network performance and matching problems.

2. Private Cloud (PrivateClouds)

Private cloud is an extension and optimization of enterprise traditional data center, which can provide storage capacity and processing power for a variety of functions. "Private" means that such platforms belong to non-shared resources rather than their security advantages. Private clouds are built for individual use by a customer, so these data, security, and quality of service are better guaranteed than public clouds. Because the private cloud is exclusive to customers, users have the basic settings to build the cloud, and can control the way in which programs are deployed on this technology setting.

In the private cloud model, the resources of the cloud platform are dedicated to a single organization that contains multiple users. Private clouds can be owned, managed, and operated by the organization, a third party, or both. Private clouds can be deployed either internally or externally.

There are two types of private clouds:

Internal (on-premise) private cloud: also known as internal cloud, it is built by the organization in its own data center, as shown in the following figure. This form is limited in scale and resource scalability, but it helps to standardize cloud service management processes and security. Organizations still have to bear capital costs and maintenance costs for physical resources. This approach is suitable for organizations that need complete control over applications, platform configuration, and security mechanisms.

External (off-premise) private cloud: this private cloud is deployed outside the organization and managed by a third party. Third parties provide the organization with a dedicated cloud environment and ensure privacy and confidentiality. This solution costs less than the internal private cloud and is easier to expand the business scale.

3. Hybrid Cloud (hybrid cloud)

In the hybrid cloud model, the cloud platform is a combination of two different models (private or public). These platforms are still independent entities, but use standardized or proprietary technologies to bind and migrate data and applications to each other (for example, balancing between different cloud platforms).

With the hybrid cloud model, an organization can deploy secondary applications and data to the public cloud, taking full advantage of the scalability and cost of the public cloud. At the same time, it is more secure to put mission-critical applications and data in the private cloud.

The difference between public and private clouds:

Difference 1: divided from the construction location of cloud, public cloud-cloud computing services published on the Internet, the resources for building cloud are in the location of the provider; private cloud-cloud services released within the enterprise (private network). The resources needed to build the cloud platform are self-sufficient by the enterprise.

Difference 2: from the level of protocol development of cloud services, public cloud-protocol open cloud computing services do not require proprietary client software parsing. All applications are provided to users in the form of services, not as software packages. Private clouds, such as Microsoft's "cloud + end", end users need dedicated software.

Difference 3: in terms of service objects, private clouds-built for "one" customer to use alone, thus providing the most effective control over data, security, and quality of service; the company has the infrastructure and can control how applications are deployed on this infrastructure; private clouds can be deployed in the firewall of the enterprise data center or in a secure hosting site Private clouds can be built by cloud providers to build a private cloud in a corporate enterprise data center through a hosted model. The public cloud, on the other hand, provides scalable and resilient services through the network for external customers.

Public cloud or private cloud?

Three key factors

Security is the primary concern on whether to choose private cloud or public cloud, because security is undoubtedly the most basic requirement for any business. After all, in the era of big data, enterprise information is the life of the enterprise.

If you choose a private cloud solution, the "cloud" network is built on the equipment in the enterprise's own data center, that is, on the physical servers and network hardware within the enterprise. The enterprise has complete control over all the elements in these clouds. From a security point of view, such control can meet the needs of enterprises for the protection of sensitive and important data, and all access to and access to cloud data can be set and monitored, whether internal or remote access. High-end customized firewall technology can also block network threats from outside, and physical access control can be used to prevent unauthorized access.

Scalability is also a factor that must be taken into account, especially for those enterprises whose businesses are expanding rapidly, the scalability of cloud computing is a very important reason to attract them.

Both public and private cloud solutions guarantee a high degree of scalability, but only the flexibility of public cloud hosting services ensures an infinitely expanded platform that ensures the growth and expansion of your business without any risk.

But when running your own private cloud infrastructure, expanding the size of the cloud often involves investment in new hardware and a long execution time, including the connection of network equipment, while the expansion of public cloud is only a table of price corresponding to the expansion of national models. Public cloud service providers are usually able to expand the cloud in a few minutes, and the negative impact on the business during this period is almost negligible.

Cost problem

The reason why cloud computing has attracted public attention and become a dazzling new star in the IT industry, the low-cost characteristics occupy a certain reason. So after safety, the second thing to consider is the cost. In terms of cost, enterprises should consider not only the technology investment cost in the early stage, but also the continuous expenditure cost in the later stage, such as operating expenses, long-term maintenance and enterprise software and application expenses.

For small and new businesses without existing infrastructure and network support, the cost of a private cloud is extremely high. On the contrary, for large enterprises and large companies, they have their own data centers and network facilities, and they can use cloud computing technology to achieve cloud hosting so as to improve equipment utilization and save a lot of waste of assets.

For a public cloud solution, the management and maintenance of all infrastructure is left to the public cloud service provider, so the financial burden of the client is saved, which can offset each other. However, compared with the operating costs of self-maintaining servers in the private cloud, such as data connection and power, although the service cost of the public cloud will increase, it is still lower than that of the private cloud.

A cloud service evaluation method

This paper introduces a method for evaluating cloud service solutions: RUE (Resource Utilization efficiency). In this method, three values are proposed for evaluation, which are:

1. CUE- calculates the ratio of the average utilization of physical CPU to the average utilization of virtual CPU. In theory, the smaller the number, the better.

2. SUE- storage resource utilization the sum of the physical capacity of all hard drives to the maximum storage capacity available to the virtual machine. In theory, the smaller the number, the better.

3. NUE-the ratio of the sum of the maximum egress bandwidth to the maximum egress bandwidth of the virtual machine in the network resource utilization theory. Theoretically, the smaller the better.

The weight of the three RUE=a*CUE+b*SUE+c*NUE,a/b/c varies according to the needs of users, and it is impossible for the three to become lower at the same time.

So, in general,

Public cloud: CUE ↓ SUE ↑ NUE ↓

Private cloud: CUE ↑ SUE ↓ NUE ↑↓

Some cloud users basically start from scratch: originally there is no server without a complete backend IT architecture, but now due to business requirements, they want to build an IT system quickly and at low cost; while private cloud users actually move from a perfect but large and inflexible IT system to a system architecture that is more efficient, more flexible and has less impact on business.

Therefore, everyone's needs are not the same. Only talking about the initial demand, the demand of public cloud users is to go online quickly and economically. On the other hand, private cloud users are more likely to require a smooth transition, retain the existing experience and do not affect the existing business. When choosing public cloud or private cloud, the final requirement comes from the users themselves. Through our comparison, we can see that public cloud and private cloud have their own emphasis and have different comments in the eyes of different users.

As a user, you can carefully analyze your own needs to make the most economical choice.

The conversion between public cloud and private cloud is not always the same. Enterprises' demand for cloud services is different at different stages, and it is very likely that one day, due to the change of business requirements, the transformation between public cloud and private cloud is needed.

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