vClient Although you can manage ESXi 5.5, but only some simple functions such as creating virtual machines, and vSphere 5.5 are advanced features can not be achieved. The main thing is not unified management of multiple ESXi 5.5 runtime.
So there VCenter Server, VMware virtualization system, another important member.
VCenter Server enables centralized unified management, can provide such as access control, performance monitoring and configuration functions, etc., and can concentrate multiple ESXi host resources, these resources among virtual machines across the data center to share.
It shall be called the center of ESXi administrator.
Note: you need to install the three components before installing Server VCenter
1, Single Sign-VCenter the On (Authentication Service)
2, VCenter for Inventory, Service (Inventory Service)
3, vSphere Web vClient (Web client - can finally installed, but the first two one must be installed)
Three major components:
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Case environment: 
the environment, because the relationship between resources, and the SQL service VCenter services are installed on a single server
First, we need to configure the service, login identity for all services are replaced by the domain administrator: 
the IP address configuration enabled: 
Create a database for storing vCenter data sources: 
Adding a data source: 
the data source added, we install three major components: 
installation Checklist: 
Web client service, pure no brains:
after installation, you can use the client's IE browser login access, open the browser on vClient server, input https://vcenter.vmware.com:9443can be visited, if not DNS, you can also use the IP address (Note: is the IP address of the vCenter server)
into the interface, it is best to download and install a small plug-in, otherwise there will be unable to use some of the advanced features Note: when installing any browser had Turn off 
sign in using the account password VCenter server
