1 00:00:01,000 --> 00:00:07,360 Now generally it's inefficient to run multiple operating systems on the same hardware. 2 00:00:07,600 --> 00:00:14,380 In other words, in this example, I'm running windows as what's called my host operating system. 3 00:00:16,710 --> 00:00:24,690 And then I'm running Linux as a guest operating system within virtualization software or a hypervisor 4 00:00:24,870 --> 00:00:26,340 which in this case. 5 00:00:27,470 --> 00:00:29,930 Is VMware Workstation. 6 00:00:32,310 --> 00:00:39,900 So the terminology once again, the operating system installed on the hardware is called the host operating 7 00:00:39,900 --> 00:00:40,500 system. 8 00:00:44,870 --> 00:00:47,540 The hardware is called bare metal hardware. 9 00:00:47,990 --> 00:00:51,500 So in this example, the virtualization software. 10 00:00:52,650 --> 00:00:59,730 In other words, VMware Workstation is not installed directly on the bare metal hardware. 11 00:01:00,180 --> 00:01:06,720 The virtualization software is running as an application within Windows. 12 00:01:07,230 --> 00:01:10,500 Windows is installed directly on the hardware. 13 00:01:11,010 --> 00:01:18,270 A more efficient way of doing this is to run the virtualization software directly on the bare metal 14 00:01:18,270 --> 00:01:18,990 hardware. 15 00:01:19,290 --> 00:01:24,810 So in this example, I've connected to a VMware ESXi server. 16 00:01:25,260 --> 00:01:32,940 This is a physical server that has the VMware Hypervisor software installed directly on it. 17 00:01:33,390 --> 00:01:41,110 So the VMware ESXi software is software that you install directly onto a bare metal server. 18 00:01:41,160 --> 00:01:45,060 You don't run it to within another hypervisor. 19 00:01:45,240 --> 00:01:53,460 Now you can, like I've done here, run ESXi within ESXi, but that's only for testing. 20 00:01:53,610 --> 00:02:00,900 Typically what you do is you would run ESXi directly on bare metal hardware, and then you would run 21 00:02:00,900 --> 00:02:04,980 multiple virtual machines on ESXi. 22 00:02:05,670 --> 00:02:10,800 That gives you more scale and better utilisation of your hardware. 23 00:02:10,889 --> 00:02:12,780 Rather than running. 24 00:02:13,580 --> 00:02:19,700 A host operating system such as Windows on the hardware that's consuming resources. 25 00:02:20,860 --> 00:02:25,790 And then installing virtualization software and then running your virtual machines. 26 00:02:25,810 --> 00:02:29,890 In this example, the virtual machines are running directly on. 27 00:02:30,540 --> 00:02:33,990 Hypervisor software installed directly on hardware. 28 00:02:35,470 --> 00:02:39,610 So in this example, I've got Cisco Core Manager Software. 29 00:02:41,410 --> 00:02:45,520 Installed in a virtual machine on ESXi. 30 00:02:46,910 --> 00:02:53,540 So what I can do as an example is open up a web browser to that virtual machine. 31 00:02:55,600 --> 00:03:06,550 So back in the console of the virtual machine, I can use Cisco commands such as show network a zero. 32 00:03:08,520 --> 00:03:11,940 That shows me the IP address of this virtual machine. 33 00:03:13,860 --> 00:03:20,790 And I've now connected to that virtual machine from a web browser within Windows, and I can log in 34 00:03:20,790 --> 00:03:24,360 to the Cisco core manager. 35 00:03:25,950 --> 00:03:27,180 Which is running. 36 00:03:28,050 --> 00:03:30,840 In a virtual machine on ESXi. 37 00:03:32,490 --> 00:03:38,400 So this server that I've connected to has an IP address of 1921681242. 38 00:03:40,130 --> 00:03:43,910 But the Cisco core manager has a different IP address. 39 00:03:45,120 --> 00:03:47,220 My local Windows PC. 40 00:03:48,980 --> 00:03:55,970 In this example has multiple IP addresses configured but is using a separate IP address to the virtual 41 00:03:55,970 --> 00:03:59,930 machine, which is different to the ESXi server. 42 00:04:00,580 --> 00:04:06,910 So when you connect to websites such as Facebook or Cisco. 43 00:04:09,020 --> 00:04:15,050 There will be many servers running within data centers that are providing the hosting for these websites 44 00:04:15,050 --> 00:04:17,720 and the back end software such as databases. 45 00:04:20,690 --> 00:04:23,780 Those servers are typically not physical servers. 46 00:04:24,170 --> 00:04:29,720 They are virtual servers running on hypervisor software such as iSCSI. 47 00:04:29,780 --> 00:04:36,590 So you can have multiple virtual servers running on a single physical server. 48 00:04:36,800 --> 00:04:44,480 In this example, I've got one server, but notice I've got many virtual machines that can run on that 49 00:04:44,480 --> 00:04:45,920 single server. 50 00:04:46,130 --> 00:04:57,560 And in addition, I can run a virtual routers and other virtual devices as virtual machines on the same 51 00:04:57,560 --> 00:04:58,190 server. 52 00:04:58,970 --> 00:05:10,130 So this is a Cisco CSR, Cisco Services router, 1000 VE, which is a virtual router running as a virtual 53 00:05:10,130 --> 00:05:10,850 machine. 54 00:05:12,910 --> 00:05:16,570 On the hypervisor, which in this case is iSCSI.