Hi Guys,

This is my first post in “Virtualization”. Well i hope you all know that what is virtualization and how easily it is swallowing the scenario of “Single H/W Single OS”. 

Here i am posting about the difference between  ESX & ESXi(Most comman Ques. in interviews) .The two most sucessful Bare Metal O/S of VMWARE.

1.      Service Console
ESX Server :  Having built-in virtual machine called the “service console”. This service console is a modified version of RHEL that is installed and running in every ESX Server. So most of the command line tools are similar to RHEL, Like there are number of ESX-related tools in the service console, most of which start with “esxcfg-“ and run by accessing the service console with SSH or via Putty.

ESXi Server : VMware ESXi Server has no service console, there is no SSH access to the server and there are no 3rd party applications that can be installed on the server. VMware came up with is the Remote Command line Interface (RCLI). This is an application which install as a VM and it is used to perform scheduled or ad hoc scripting on the VMware Infrastructure. ESXi RCLI is its own command line where ESX server service console scripting would be made up of most Linux utilities.

2. ESXi Server’s service console (firewall)

The ESXi security profile configuration consists of a couple of services that you can either enable or not enable with inbound access. Here is a comparison between the two

Esx-i Security profile having 2 services only.
VMware ESX Server (full) Security Profile

3 Vmware ESXi Server has a ” Yellow Service Console” Screen
Instead of the full ESX Server “service console” boot (which looks like a Linux server booting), ESXi has a tiny “Direct Console User Interface (DCUI)”. Unofficially, I like to call this the “yellow firmware console”. In this ESXi console, all that you can configure are some very basic ESXi server options such as the root user password, network settings, and a couple other items. In the graphic below, you can see why I call it “yellow”:

4 VMware ESXi Server is extremely thin = fast installation + fast boot
Because the service console has been removed from ESXi, the footprint in memory has been reduced to 32MB. In comparison, the full ESX Server on disk footprint is about 2GB.
Because the hypervisor is so small, the installation happens in about 10 minutes (or so) and the server boots up in 1-2 minutes. This is quite different from the full ESX server installation and boot, both of which are longer

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