4.1 Visualization

✅ Definitions

• ✔️ Host: anfilcion, the real machine

• if we use VM, my host can behave differently

• ✔️ Guest: Invitado, the virtual machine

• ✔️ Virtual Machine: a software/program that simulates different scenarios
• In order to use a virtual machine,
• need to install a virtualization software on the host

• over the virtualization software, we can install different OS, different applications…

• before:

  • my computer
  • OS
  • applications

• after:

  • my computer
  • virtualization SW
  • several OS, several applications…
• ❌❌❌ We are not partitioning our real machine(host) ❌❌❌
• creating a Virtual Machine is not partitioning
• we do not physically have lin-win installed
• we are having the real machine behave as different OS
• my host only has a windows, but it can bahave as mac, linux…

✅ Virtualization Software

☑️ Hyper-V

• comes with Windows
• 👎🏻 can only use Hyper-V when the host is windows
• guest can be whatever
• so you can simulate as whatever
• 👍🏻 when you simulate windows as guest, perfect
• 👎🏻 when you simulate mac/linux(not windows) can be slow

☑️ Virtual Box

• was created by Linux
• free of charge
• 👍🏻 host can be whatever
• 👍🏻 guest can also be whatever
• 👍🏻 very well structured software

☑️ VM Ware

• 👎🏻 need to pay
• 👎🏻 bit complicated, organized in packages, interconnected between them

🆚 Benchmark of three softwares

• comparison: benchmark

Benchmark: https://www.janbasktraining.com/blog/comprehensive-study-hyper-v-vs-vmware-vs-virtualbox/

💡 Activate VM before using virtualization

• apart from downloading the SW
• you also need to activate/enable in your BIOS

🛠️ Use of Virtual Machines

1️⃣ VM for departments

• Each department in a company is managed/controlled by a VM
• 👀 If you work in HR,
• you connect to HR virtual machine
• let you enable remote working
• each VM has different strucutre for each department
• no physical department exist

2️⃣ Cloud computing

• computacion en la nube
• cloud: remote computer

✔️ Three types of clouding

• IAAS: Infrastucture as a Service

• you use only the hardware of the contracted company

• PAAS: Platform as a Service

• you use hardware + development tools of the contracted company

• SAAS: Service as a Service
• you use everything of the contracted company
• take your business to the cloud

✔️ Clouds are public

• they are shared by several companies
• Clouds do not have one computer dedicated to each customer
• Customers use the same computer,

• but they use a VM, specified to them

• A has Jam factory, contract VM SAAS company
• B has Car factory, contract VM SAAS company
• C has Pillow factory, contract VM SAAS company
• VM SAAS company has only one computer
• when A tries to acccess, it shows A VM
• when B tries to acccess, it shows B VM, car factory

✅ Download Virtual Box

• (1) Go to Oracle VirtualBox webpage

• (2) Download two files 1: .exe

  • choose what OS your host has ➡️ download VirtualBox.exe
  • then run as administrator, do a right click ⭕️
  • do not double click, this will run as normal mode ❌
  • After running as admin, run in next mode
  • Do not modify anything! Modifying will alter the file structures

• (2) Download two files 2: extension pack

  • extension pack: vbox-extpack
  • special package for transparent encryption, for encrypting your disk
  • also for using for camera in your VM
  • also for using USB 2.0(fast USB)
  • also for remote desktop

SoHee cannot use her USB 3.0 in her VM. Why?
- she did not install the extension pack

• (3) Link the extension pack to the .exe
• In order to link, join the extension pack to the VM
• file ➡️ tools ➡️ extensions
• then click on install
• and click on the green check
• extension pack always has a green check

😱 VirtualBox installation errors

1️⃣ c++ Redistinbutable Package Missing

• means an API is missing
• 💊 Go to microsoft webpage
• search and download the API
• then execture, double click
• and install the API

2️⃣ Traces of previous verions found

• problems bc of traes/remains leftovers of the old version

• If you have a previous version of VM in the computer
• and somebody deleted the old version

• traes/remains of the previous version of Virtual Box

• ✔️ Traces could be in two places
• (1) in C\Users\<user>\.VirtualBox
• enter that folder
• empty the folder, delete all the content
• we only empty the folder when the error appears

• if there is no error, do not empty the folder

• bc if you delete that folder with no reason,
• you will delete all the access to that VM

• you will have to rebuild the accesses

• If the .VirtualBox does not exist, it means previous versions of VM does not exist

• (2) in C\Windows\system32\drivers
• and serach files
• starting by VBox with extension .sys
• VBox*.sys
• * is a wildcard

• then delete

• again, also only delete when you are having problem
• if you do not have any problem, but delete,
• you will lose access to the VM

• and before deleting, communicate with your team that you are deleting them

• Note: All applications can have trace problems
• 💊 look for traces inside the C\Users\<user>\.<nameOfApplications>

3️⃣

4️⃣

• 1️⃣
• 2️⃣
• 3️⃣
• 4️⃣ 👍🏻 👎🏻

⭐️⭐️⭐️ EXAM ⭐️⭐️⭐️
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