[wonderful learning journey of cloud computing] phase I: getting to know cloud computing for the first time

Speaking of “ Cloud computing ” These three words , I'm sure you've heard it countless times , So I want to ask you ,“ Cloud computing ” What is it ？ Can you answer that ？ First of all, when we hear the three words of Cloud Computing , It feels very tall , Highly unmeasurable , New technology pronouns and so on . If you haven't touched , It feels far away from us , It's not living , Unlike QQ Life oriented application software like wechat .

01 Cloud computing begins Let's start with the age of computers ,386 Time , Refer to 80386, It's using 8086 Machine and instruction set , and CPU Instruction sets are divided into complex instruction sets and reduced instruction sets . We are familiar with ordinary PC It uses a complex instruction set , Minicomputers use a reduced instruction set , such as UNIX System . And then again 80186、80286、80386、80486、80586, Later, these were collectively referred to as 80X86 Era . After it was introduced into China, it was called X86, That's what we're talking about now X86 framework . Since it is not possible to register trademarks digitally , at that time Intel The company puts itself CPU Named Celeron series 、 Pentium series 、 Core series , But these are not used by the server CPU, The server uses Xeon series （Intel Xeon Platinum ） Of CPU.

With the development of Internet era , Every company has to build its own data center , Use your own server , The construction of the computer room is very complete , Install many servers , Only one business is running on each server , However, the utilization of server resources is particularly low ; If a server running multiple services is not safe enough , When a business goes wrong, it may affect other businesses , Therefore, it causes a serious waste of resources .  until 90 years vmware The birth of , There is the virtualization we see now . Virtualization is equivalent to traditional physical machines. The biggest advantage is to improve the utilization of resources , The original physical server can only run one business , Up to now, one server can run multiple virtual machines , Each virtual machine runs a business , And each virtual machine is independent of each other 、 They don't influence each other , In order to improve the utilization of resources . And it's important when the business goes online , It is necessary to ensure the availability of the business , In particular, some key businesses are not allowed to be interrupted , Like banking , If the banking business suddenly breaks down , The customer can't get the money or the money disappears , Will the consequences be very serious ？ therefore , Enterprise class virtualization was born , To ensure business continuity and reliability .  What is enterprise virtualization ？ Many people should have used VMware Workstation level virtualization --VMware Workstation, With virtualization technology , For some big companies , It has a lot of business , Every time you run a business, you need to start a virtual machine . For administrators to manage 1000 A virtual machine 、 Even more virtual machines , It's very inconvenient to manage , So someone put forward the concept of Cloud Computing . So , Cloud computing is actually developed on the basis of virtualization .  But with the development of virtualization , So far, it has been very mature , Many new problems have arisen , Because more and more businesses are running , The value of data is also getting higher and higher , You need more value-added services .

 

How to understand Cloud Computing ？   First, build a website in the traditional way , How to do it ？ Server purchase required , network bandwidth , Register the website domain name , Development , A series of complex processes such as operation and maintenance , Finally, I can build my website . It's like we want clean water , Many tools need to be purchased in the early stage , Spend a lot of manpower , Finally, a well can be drilled . however , In a cloud scene , We can buy a virtual machine directly on the cloud , After relevant configuration, you can use , Then upload the files needed by the website , Then you can build the website , This can also save a lot of manpower and material resources .  Case study ： If I start a business and build a portal , In the Huawei cloud scenario , You can buy an elastic ECS first , You don't have to buy a real physical server . in addition , Elastic ECS can be charged on demand , Some cloud computing vendors can even charge by minute , Then start selecting cloud services CPU And memory , You can select the image to use according to your needs , Such as website construction 、 E-commerce , You can also choose a hard disk , Elastic public network IP, After the configuration is completed, confirm the purchase , You can use it after creating it in two minutes .  The cloud is to buy a server ？   Definitely not , This is just one of the cloud services , There are also various value-added services . For example, data analysis , You can track the operation of ECs in this year , Analyze which month the website has the highest traffic , And it can be compared with the same type and give follow-up operation suggestions . And flexible services , When the business needs to expand more servers , The same server can be easily expanded by purchasing elastic scaling Services , After setting the policy , During the peak period of business, the same business virtual machine can be automatically created to provide business ; When the business has passed the peak period , It can return to the normal state through elastic services . You can't do this in the traditional virtual world , This is the advantage of enterprise virtualization .

02 Cloud computing and virtualization

from 1964 From the year onwards ,IBM Is a great enterprise , It has a history of one hundred years . and IBM The most profitable businesses are mainframes and minicomputers , Its minicomputer is P series （POWER framework ）, Its system is AIX. The minicomputer service charge is very expensive , and UNIX Not open source , therefore UNIX Slowly declining . But what other companies will use minicomputers ？ But financial companies still use , Because the minicomputer is too stable , Its hardware and software are IBM Of , There is no compatibility issue , It can ensure the stable operation of key businesses . At the time IBM Put forward a question called “partition” Virtualization technology , Cut the of real physical services into multiple independent spaces , Run different operating systems for virtualization , Unlike today's virtualization technology, it is logically isolated . until 1999 year ,vmware stay X86 Virtualization on the architecture , so far VMware Also launched in X86 Virtualization on Architecture , I won't support it IBM Minicomputer architecture . therefore , What we're talking about now is virtualization , Generally speaking, it also means X86 Virtualization of architecture . except vmware Outside the virtualization of , also citrix（ citrix ）,Hype-V（ Microsoft ）,KVM,XEN etc. , In a virtualized world VMware I'm a worthy boss , But in the world of clouds ,VMware Not the first . 

  however , Virtualization is still needed to do the underlying cloud , Many enterprises will not choose to use commercial virtualization , Because of the choice VMware Virtualization is about to give VMware Pay royalties , Instead, choose open source virtualization . In the present world , There are not many manufacturers of virtualization , But there are many cloud manufacturers , There are more than in our country 500 A cloud enterprise .  What is the relationship between cloud computing and virtualization ？  Cloud computing is only a control surface , Virtualization is doing business . Simply put, the cloud computing layer does not provide any resources , All resources are completed by the virtualization layer . For example, we apply for a cloud disk drive , It's not done by the cloud computing layer , It is provided by the storage connected by the virtualization layer .  Case study ：   Farmer Shanquan said “ We don't produce water , We are just nature's porters ”. Because the farmer collects the spring water , Process and sell , It does not produce water itself . And cloud computing ？ It pools various resources and provides them to the upper layer for use , It does not itself produce resources , Instead, it provides resources through the virtualization of underlying docking . 

  03 The future of Cloud Computing In the world of clouds , Who did the best ？ The first name is AWS, The second place is Microsolf, The third place is Aliyun. What are the clouds in China ？ Now the familiar clouds are , Alibaba cloud , Tencent cloud , Jingdong cloud , Meituanyun , Jing chuyun , Changjiang Yun et al . But there are many provincial and municipal government agencies , For data security reasons, you will not choose to put your cloud on alicloud , But will make their own cloud . Therefore, provincial and municipal government agencies will choose to cooperate with cloud enterprises , Be your own cloud , Like Jing chuyun , Changjiang Yun et al . Except for cloud enterprises like Hubei , Other provinces and cities also need it , therefore , The prospect of cloud computing is also very considerable .

  Said so much , What is Huawei's cloud computing ？ The next issue will reveal , Welcome to follow and forward ...... 

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Thank you for reading this issue , This is the first issue of our cloud computing topic , Later, Mr. Zou will lead the Yutian cloud computing lecturer team to output more high-quality technical content , Welcome your long-term attention , Look back regularly ！