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If there is no virtualization technology, then only a single server can run a single server, which greatly reduces the server utilization. It's like this:

In order to make full use of the resources of the server, we can deploy ESXi to run multiple services on a single physical server.

Virtualization is a technology that transforms hardware resources from physical to logical, breaks the original physical structure, enables users to manage these resources flexibly, and allows multiple operating systems to run on one physical machine at the same time to maximize resource utilization and flexible management.

Advantages of Virtualization:

① reduces the number of servers and reduces the cost of hardware procurement

Maximize ② resource utilization

③ reduces the cost of computer room space, heat dissipation and electricity consumption.

④ hardware resources can be dynamically adjusted to improve enterprise it business flexibility.

⑤ high availability

⑥ makes physical hardware adjustments without service interruption

⑦ reduces management costs

⑧ has a more efficient disaster preparedness capability.

ESXi is not only one of the important members of vmware server virtualization system, but also the foundation of vmware server virtualization. In fact, it is also an operating system, using the linux kernel (vmkernel), the installation mode is bare metal, directly installed on the physical server, do not need to install any other operating system.

Vsphere is an enterprise virtualization solution based on cloud computing launched by vmware in 2001. The core component is esx, which has been replaced by esxi. After five versions of improvement, the product has realized the integrated solution of virtualization infrastructure, high availability, centralized management and performance monitoring, and is still expanding and strengthening, with more and more functions. It is known as the industry's first cloud computing operating system.

Basic physical structure of vSphere:

Virtualized servers are physical servers, also known as x86 servers, which provide cpu and memory virtualization resources through network services, and virtual machines run on them. Virtualized servers can be composed of multiple servers, and ESXi can be installed directly on bare metal hardware.

The importance of storage network storage is self-evident. It is the core of virtualization. It can not only be used to store all the virtualized data, but also closely related to the performance of virtual machines. Storage resources are uniformly managed and allocated by vsphere. Storage network can use san, nas and other storage technologies

Network services are used to connect all devices in the entire architecture. Gigabit is recommended, otherwise many functions will not achieve the desired results.

Centralized management server (vcenter) is one of the important components of vsphere. Many advanced functions of vsphre are implemented through vcenter, such as vmotion (migrate virtual machines from one esxi to another esxi without interruption of service), HA (virtual machines are automatically migrated to another esxi when ESXI goes down), and so on. Not only that, vcenter can also put multiple esxi into a cluster for unified management, and virtual machines can also share resources.

Client (vclient) is one of the important components in vsphere, which is used for users to connect to esxi or vcenter to manage and allocate various resources. Vcenter consists of two versions, vclient and webvclient. Today we mainly know about vclient.

There are three versions of vSphere: standard Edition, Enterprise Edition, and Enterprise enhanced Edition. Needless to say, one version is more powerful than the other.

License for vsphere

There is a default evaluation period of 60 days after ESXi installation. Users can switch from evaluation mode to license mode at any time during the 60-day evaluation period. Vsphere licenses are calculated on the basis of the number of cpu (1 cpu for 2-core and 4-core cpu)

The license key assigned is not fixed to the esxi host, and the esxi host can be assigned in any combination. For example, the vsphere license key for 10 cpu can be assigned to any of the following combinations of esxi hosts

5 2cpu host

3 2cpu hosts and 1 4cpu host

2 4cpu hosts and 1 2cpu host

1 8cpu host and 1 2cpu host

Next, to install ESXi, you need to consider specific server selection and minimum hardware configuration requirements before installation:

Server selection: the server can choose dedicated servers: IBM, DELL, HP, or assembled.

Hardware selection:

1.ESXi can only be installed and run on 64-bit x86cpu servers

2.ESXi5.5 requires hosts to have at least 2 cores of cpu (select the same vendor intel or amd for multiple esxi networks, otherwise the advanced features provided by vsphere are not supported)

3.ESXi5.5 needs at least the physical memory of 4gb

4. To support 64-bit virtual machines, x64cpu must support and enable hardware virtualization (vt-x or rvi)

5.ESXi5.5 requires one or more Gigabit or 10gb Ethernet controllers

Any combination of 6.1or more controllers: a basic scsi controller or raid controller.

Of course, if you want to better implement all the functions of vSphere, you need more powerful hardware configuration as support. What can affect the performance of vSphere is not only powerful CPU and memory, but also stable network transmission and efficient storage devices.

Start installation

First, you need to test whether cpu meets the installation requirements.

Link to the securable tool:

Https://pan.baidu.com/s/1nrDRNn00-S4hJiAsq1kZdg

Extraction code: kjdy

Use the securable tool to view the cpu status, which must be 64-bit, enable hardware execution Protection (Hardware D.E.P), and enable virtualization support for VT-x or RVI.

There are two ways to install ESXi: bit interactive installation and script installation.

① interactive installation: CD or DVD, USB, pxe network boot installation

② script installation.

We accept the first method of installation today.

Select the VMware ESX operating system, version 5, and put the iso CD image of ESXi5.5 into the CD drive, hard disk 100GB, omitting the basic steps.

ESXi5.5 iso CD Mirror Link:

Https://pan.baidu.com/s/1YeV01PfNOxg0ePmtiEb47A

Extraction code: 10px

Will be shown by the progress bar, wait patiently.

Server configuration is complete, then install vclient5.5 and connect to ESXi5.5 (the advanced features of ESXi are to install webvclient5.5)

The vclient5.5 installer includes microsoft.NET 2.0SP2, microsoft.NET 3.0 SP2, .NET 3.5SP1 visual J#, vsphereclient, so when installing vclient, you also need to make sure that no version of microsoft visual j# is installed on the system.

Installation conditions (minimum requirements)

Vclient5.5 software link:

Https://pan.baidu.com/s/1e1YK_S6Ge7_ImP7QeZjDMA

Extraction code: 7ei4

The installation process is slight.

This is the same as creating a virtual machine in VMware Workstations.

It was done step by step according to the prompt.

The above process without screenshots is completed step by step according to the prompts.

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