
Centralized Management with vCenter Server
Learner Objectives
After completing this lesson, you should be able to meet the following objectives:
- Describe the vCenter Server architecture
- Recognize how ESXi hosts communicate with vCenter Server
- Identify vCenter Server services
About the vCenter Server Management Platform
vCenter Server acts as a central administration point for ESXi hosts and virtual machines that are connected in a network:
- Directs the actions of VMs and hosts
- Runs on a Linux-based appliance
About vCenter Server Appliance
vCenter Server Appliance is a prepackaged Linux-based VM that is optimized for running vCenter Server and associated services. The vCenter Server Appliance package contains the following software:
- Photon
- PostgreSQL database
- vCenter Server services
During deployment, you can select the vCenter Server Appliance size for your vSphere environment and the storage size for your database requirements.
vCenter Server Services
vCenter Server services include:
- vCenter Server
- vSphere Client
- vCenter Single Sign-On
- License service
- vCenter Lookup Service
- VMware Certificate Authority
- Content Library
- vSphere ESXi Dump Collector
When you deploy vCenter Server Appliance, all these services are included.
vCenter Server Architecture
vCenter Server is supported by the vSphere Client, the vCenter Server database, and managed hosts.
About vCenter Single Sign-On
vCenter Single Sign-On provides authentication across multiple vSphere components through a secure token mechanism:
- User logs in to the vSphere Client.
- vCenter Single Sign-On authenticates credentials against a directory service (for example, Active Directory).
- A SAML token is sent back to the user’s browser.
- The SAML token is sent to vCenter Server, and the user is granted access.
About Enhanced Linked Mode
With Enhanced Linked Mode, you can log in to a single instance of vCenter Server and manage the inventories of all the vCenter Server systems in the group:
- Up to 15 vCenter Server instances can be linked in one vCenter Single Sign-On domain.
- An Enhanced Linked Mode group can be created only during the deployment of vCenter Server Appliance.
ESXi and vCenter Server Communication
The vSphere Client communicates directly with vCenter Server. To communicate directly with an ESXi host, you use VMware Host Client.
vCenter Server Appliance Scalability
Metric | vCenter Server Appliance 7.0 |
Hosts per vCenter Server instance | 2,500 |
Powered-on VMs per vCenter Server instance | 40,000 |
Registered VMs per vCenter Server instance | 45,000 |
Hosts per cluster | 64 |
VMs per cluster | 8,000 |
Review of Learner Objectives
After completing this lesson, Centralized Management with vCenter Server, you should be able to meet the following objectives:
- Describe the vCenter Server architecture
- Recognize how ESXi hosts communicate with vCenter Server
- Identify vCenter Server services