Virtualization First Class
- What is virtualization:
① breaks the hard connection between the physical hardware and the operating system and the applications running on it ② a physical host can run multiple operating systems at the same time. ③ virtualization software installed on top of the hardware constitutes a virtualized platform that can create multiple virtual machines.
- What is a virtual machine:
As with physical machines, it is a software computer that runs the operating system and applications.
- Why virtualized Computers:
x86 computer hardware is set to run only on a single operating system and a single application causes Waste of computer hardware/performance.
- Virtualization Infrastructure:
- Build your entire virtualization infrastructure with VMware VSphere, a set of server virtualization solutions from VMware , including several interconnected physical computers and storage devices. The advantages can dynamically move resources and processing power and allocate hardware resources. There is no need to permanently allocate servers, storage, network bandwidth to each application.
- cloud computing: Span style= "font-size:10pt" >
① Virtualization infrastructure is the foundation of cloud computing, which relies on scalable elastic models to provide IT services that rely on virtualization itself.
- server consolidation:
① saves on equipment costs and increases the utilization of hardware. ② For example: multiple physical machines and 1 virtualized servers simulate multiple virtual machines with the same effect. ③ For example: The company needs to test the software but requires 5 client programs to test simultaneously and to purchase 5 physical machines. If you have a virtualized platform installed, you can open 5 simultaneous client test software.
- Business continuity:
- With virtualization, it can shorten and even eliminate planned and unplanned downtime. planned: the virtual machine implementation can be migrated to other hosts before hardware maintenance of the host without interruption of service. Unplanned : sudden failure of the host, automatic switch to other virtual machine operation, guarantee the continuity of service. The virtual machine transforms the configuration, firmware, and system programs into data on disk and backs up the data to implement the restore. Advantages: Management cost savings, failure maintenance time is short.
- VMware VSphere:
The core components include the ESXi,vCenter Server software in the VSphere environment. Consists of the virtualization layer, the management layer, the interface layer.
- Security: implemented through Vshield . Scalability : The physical host can be scaled as needed, and the virtual machine expands memory without shutting down the machine.
- Virtualization Layer: includes infrastructure services and application services.
① COMPUTE Services: CPU and memory scheduling allocation service. ② Storage Service : Allocates scheduling storage resources for virtual machines. ③ Network Service: provides a physical network for virtual machines for communication.
- Application Services : is a set of services to ensure application availability, security, and scalability.
- Management level: VMware vCenter Server is the central point for configuring and managing virtualized IT environments with two core components ofVSphere :vmware ESXi and VMware VCenter Server ESXi is a native architecture of a Linux kernel-based system that can be run on bare metal to create a virtualized platform.
- VMware vsphere Components and features:
①vCenter Server: A Windows service that acts as the central administrator of an ESXi host connected to a network to create a host resource pool. can be monitored. Manage Physics. Virtual infrastructure
- VMware VSphere Client: to connect to vcenter Server or ESXi from the window PC.
- Vmware vsphere Web client: /span> remote from IE to vcenter server.
- Vsphere vmotion: Move an open virtual machine from one server to another server without interruption.
- Vsphere storage vmotion: The migrates virtual machine files between stores, and the service is uninterrupted.
- physical topology for vsphere data centers: A typical VMware vsphere data center consists of basic physical building blocks. (x86 virtualized servers, storage networks, and arrays.) IP network, Management Server, desktop client)
storage networks and Arrays: Fibre Channel SAN arrays, iSCSI san arrays, NAS arrays
IP network: multiple network cards, providing high bandwidth and reliable network connectivity.
- vCenter Server: provides a single point of control for the data center.
- Network: Manage network hosting management traffic, storage network, data network
Experimental steps:
- ESXi installation requirements: ① installing a server with a 64-bit CPU ② requires a host at least two cores ③ at least 2G of memory ④ one or more gigabit or 10G Nic ⑤blos open VT (Hardware virtualization)/virtual machine vm-s (set) CPU tick vt-x.
- loading System media: CD, u disk, network boot
- to install the system on a virtualized platform three ways: ① Client device (feel not fast or slow to find) ② Host device (ESXi Server CD-ROM) ③ data store ISO file (to upload the shutdown to memory)
- Virtualization Platform Client installed VMware Tools (Linux 6) This article is from the "It Technical Documentation" blog, please be sure to keep this source http://yangduo.blog.51cto.com/9437167/1584776
Virtualization Overview
