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what is vmware vsphere

Communication between vCenter Server and ESX

  • vCenter Server interconnects with the ESX/ESXi host agent through the VMware vSphere API (vSphere API).
  • When a host is added first to the vCenter Server, vCenter Server sends a vCenter Server agent to run on the host.
  • The vCenter Server agent acts as a mini-vCenter Server to make the following functions:
    • Relays and enforces source allocation decisions complete in vCenter Server, including those that the DRS engine sends.
    • Passes virtual machine provisioning and configuration change commands to the host agent.
    • The host agent change the commands of host configuration.
    • The host agent performance figures, alarms, and error conditions and sends to the vCenter Server.
    • ESX/ESXi hosts allows management at different release versions.
d6c-vc-host-agent
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Components in vSphere product suite

vsphere product suite
The most important components in the vSphere product suite are
  • ESXi – is a type 1 hypervisor. A hypervisor is a part of software that creates and runs virtual machines. In vSphere, virtual machines are installed on ESXi servers.
  • vCenter Server – is a centralized management platform and framework that lets you manage virtual machines and ESXi hosts centrally.
  • vSphere Update Manager – An add-on package for vCenter Server that helps you keep your ESXi hosts and VMs patched with the latest updates.
  • vSphere Web Client – is a web-based user interface used for handling a virtual infrastructure.
  • vSphere Client – Windows application a locally installed with a graphical user interface (GUI) everyday handling tasks and virtual infrastructure to be advanced configuration.
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VSphere Web Client

vsphere web client
  • It is the Web-based application that connects users to the vCenter Server to manage installations and handle inventory objects in a vSphere environment.
  • An object navigator, the main workspace, and the tasks and alarms panel is the features of graphical user interface (GUI) presents by the Web Client.
  • Through this GUI, the objects listed in the virtualized data center can be manage and supervise by the vSphere administrator.
  • Java server comprised the Web Client and an application based on Adobe Flex that runs in a browser.
  • VCenter Server through a Web browser access by user using vSphere Web Client.
  • The intermediate communication between the browser and the vCenter Server by using VMware API in vSphere Web Client.
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