Now generally it's inefficient to run multiple operating systems on the same hardware.
In other words, in this example, I'm running windows as what's called my host operating system.
And then I'm running Linux as a guest operating system within virtualization software or a hypervisor
which in this case.
Is VMware Workstation.
So the terminology once again, the operating system installed on the hardware is called the host operating
system.
The hardware is called bare metal hardware.
So in this example, the virtualization software.
In other words, VMware Workstation is not installed directly on the bare metal hardware.
The virtualization software is running as an application within Windows.
Windows is installed directly on the hardware.
A more efficient way of doing this is to run the virtualization software directly on the bare metal
hardware.
So in this example, I've connected to a VMware ESXi server.
This is a physical server that has the VMware Hypervisor software installed directly on it.
So the VMware ESXi software is software that you install directly onto a bare metal server.
You don't run it to within another hypervisor.
Now you can, like I've done here, run ESXi within ESXi, but that's only for testing.
Typically what you do is you would run ESXi directly on bare metal hardware, and then you would run
multiple virtual machines on ESXi.
That gives you more scale and better utilisation of your hardware.
Rather than running.
A host operating system such as Windows on the hardware that's consuming resources.
And then installing virtualization software and then running your virtual machines.
In this example, the virtual machines are running directly on.
Hypervisor software installed directly on hardware.
So in this example, I've got Cisco Core Manager Software.
Installed in a virtual machine on ESXi.
So what I can do as an example is open up a web browser to that virtual machine.
So back in the console of the virtual machine, I can use Cisco commands such as show network a zero.
That shows me the IP address of this virtual machine.
And I've now connected to that virtual machine from a web browser within Windows, and I can log in
to the Cisco core manager.
Which is running.
In a virtual machine on ESXi.
So this server that I've connected to has an IP address of 1921681242.
But the Cisco core manager has a different IP address.
My local Windows PC.
In this example has multiple IP addresses configured but is using a separate IP address to the virtual
machine, which is different to the ESXi server.
So when you connect to websites such as Facebook or Cisco.
There will be many servers running within data centers that are providing the hosting for these websites
and the back end software such as databases.
Those servers are typically not physical servers.
They are virtual servers running on hypervisor software such as iSCSI.
So you can have multiple virtual servers running on a single physical server.
In this example, I've got one server, but notice I've got many virtual machines that can run on that
single server.
And in addition, I can run a virtual routers and other virtual devices as virtual machines on the same
server.
So this is a Cisco CSR, Cisco Services router, 1000 VE, which is a virtual router running as a virtual
machine.
On the hypervisor, which in this case is iSCSI.