Cloud (official name: cloud computing) is a system located in another location via the Internet line, instead of managing data such as images and texts by physically placing a server at home or in the office. Refers to the mechanism to use. It’s not the name of the technology.
In other words, it is a service that benefits from connecting to the Internet, and conversely, most services cannot be used unless it is connected to the Internet.
You can access and do business from various terminals such as smartphones and tablets anytime and anywhere without downloading what was previously downloaded by purchasing software on the computer itself. It came to be.
Many cloud services are pay-as-you-go, and can be introduced quickly, but once you decide on a service and continue to use it, it becomes difficult to move to another service, and security and obstacles are in-house. I can’t control it with.

Cloud means “Cloud”, but he mentioned that network diagrams were often represented by clouds, and that it was not possible to know which server in which country, for example, iCloud had photos stored on. It is said that it comes from the image that users are “provided by a computer hidden in the cloud” without being aware of the location of the software or data server.


History of cloud computing

As mentioned above, the cloud means “cloud” in the first place, but it is said that the origin of the cloud is that it has traditionally used cloud-like figures when drawing the Internet.

The term “cloud computing” was coined in 1997 by Cherappa, then a professor at the University of Southern California, but was not widespread at the time.
The concept of the cloud originally existed, but the term became popular in 2006 when Eric Schmidt, then Google CEO, described his services as “cloud computing.” Because I called it, it quickly gained recognition.



Cloud classification

Public cloud

A public cloud is, as the name implies, a service that is open to the public, regardless of company, organization, industry, or industry.
For example, it is a service that anyone can easily use, such as a video site, webmail, a map application, or a translation service.
Of course, the public cloud also includes cloud services provided to people who work in specialized fields such as website creation.


Private cloud

Apart from this, when a relatively large company creates its own environment on the cloud and provides cloud services from this environment to each department or individual in the company, it is called a private cloud. .. The “customization” introduced in the disadvantages of cloud services also has advantages in that it can be freely done, but it requires a large cost and human burden for construction, maintenance, and management.

Among them, the private cloud is a on-premises type that optimizes the current computer resources by utilizing cloud technology, and the server body and installation location are provided by the cloud operator and are part of the system. Can be divided into hosting type that companies occupy and use.



Cloud type

IaaS (Infrastructure as a Service)

IaaS is a service that provides hardware and infrastructure functions such as desktop virtualization and shared disks via the Internet. You can increase or decrease the number of servers, CPU power, memory capacity, HDD, etc. by utilizing the hardware and network provided by an external operator.
It is sometimes called HaaS (Hardware as a Service), but strictly speaking, the one that includes the OS is called IaaS, and the one that does not include the OS is called HaaS.


SaaS (Software as a Service)

It is a service that provides a development environment (platform) for building and running applications via a network. Instead of owning the software in-house, you can use the software provided by an external service company via the network, and you can expect to reduce the cost of using, installing, and updating the software.
SaaS represents services that provide software functions such as e-mail, groupware, customer management, and financial accounting, and was formerly called ASP (Application Service Provider). However, strictly speaking, ASP is a single-tenant system in which one system is used by one company, and SaaS is a multi-tenant system in which one system is used by multiple companies.


PaaS (Platform as a Service)

PaaS is a service that provides platform functions for executing applications such as virtualized application servers and databases via the Internet.
It does not own a platform in-house and utilizes services provided by external businesses via a network. In addition to IaaS, database software, Web server software, and program development environment are provided. The application will be prepared in-house.
While SaaS is a cloud service that is easy for the general public to use, PaaS can be said to be a indispensable service for system developers.


DaaS (Desktop as a Service)-Dozen

The thin client system is realized not on the company’s own server but on the server of an external cloud service provider.
(Thin client system means limiting the functions of your PC or notebook PC by your own server in case of theft or loss.)

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Advantages of the cloud

Cost aspect

By using the cloud, the general public can use most of what they have purchased and downloaded for free.
Enterprises can now use the cloud to significantly reduce installation and running costs.
For example, the introduction cost is to purchase a server and secure storage for the supermarket, and the running cost is to use the cloud for server power and labor costs required for operation, replacement equipment in case of failure, etc. If so, it has become possible to significantly reduce costs with pay-as-you-go usage fees.


Business improvement

Traditionally, on-the-go businessmen had to go back to work before going home to write a daily report. However, by using the cloud business management service, it became possible to log in to the service from the terminal at home and write a daily report after returning home. In addition, by using the cloud, business efficiency is improving, such as being able to hold meetings anytime, anywhere.



In the past, many companies waited because of security concerns, but recently the idea that it is safer to leave it to a professional expert than to manage security in-house is becoming widespread, and the latest There is no need to update or perform regular maintenance in-house, and it is automatically performed by the cloud operator, so you can always use the latest security.
Furthermore, even if you are physically damaged by a disaster, the software server and database are under the control of the operating company, so there is a huge advantage in terms of backup compared to operating in-house.



Disadvantages of the cloud

Cannot be used unless connected to the Internet

For example, some people may be in trouble if software such as Office cannot be used unless it is connected to the Internet.
If the network with the cloud operator fails, the service will not be available. In addition, depending on the service, there is a possibility that the operating rate will be lower than that of the company’s dedicated server that has adopted a redundant configuration due to network interruption during maintenance.



Of course, no matter how professional the security is, it is impossible to prevent attacks on the server. In addition, we must be involved in the risk of personal information leakage by a third party.
In order to safely use the convenient technology of the cloud, select a secure cloud operator, and instead of relying on the cloud operator, prepare for brute force (brute force attack) and use a strong password for each individual. Actions such as making decisions and stopping the reuse of passwords are also very important.



Typical cloud service

Video services such as Youtube and Netflix

With Yotube, you can store and manage the content posted by users, and with Netflix, you can pay the owner who holds the copyright of the company to store and manage it, so that users can save and manage it online without downloading DVDs and videos. You can watch videos anywhere.


Online storage services such as DropBox, OneDrive, and iCloud

This is a service that rents out the disk space of the server and database owned by the business operator for storing files such as images and videos.
This allows us to store files over the network on the operator’s server or database, without reducing the storage capacity (free space) of our computer or smartphone . You can leave it.


Webmail services such as Gmail

Webmail corresponds to the example of SaaS and inherits the above elements of online storage, but the most notable part of using the cloud is “mail software”. The main functions such as “Send / Receive”, “Junk E-mail / Virus Countermeasures”, “Attachment Encryption”, and “Miscellaneous Send Countermeasures” can be done by simply registering / logging in to your account without downloading email software. I can do it.
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Amazon Web Services

Amazon Web Services is an acronym for AWS, also known as AWS, and has been providing cloud services since 2006, when the term cloud computing was not common. Cloud pioneer > Is like that.
All of the services are related to Web operators, but they are still used by many companies, and more than 70 services are provided when subdivided.

Examples: Amazon EC2 … Virtual Server, Amazon RDS … Database, AWS Direct Connect … Dedicated Line Connection, Amazon S3 … Online Storage, Amazon VPC … Virtual Private Cloud, Elastic IP adress … Fixed IP usage service.


Related Terms

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