+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ title = "Virtualization" date = 2024-04-17 slides = true +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ # Virtual Machines (and more) ------------------------------------------------------------------------- so what is a virtual machine??? ------------------------------------------------------------------------- basically you run another smaller computer in your computer ------------------------------------------------------------------------- *insert inception joke here\* ------------------------------------------------------------------------- ### Why would you want this? ------------------------------------------------------------------------- - You can run multiple OSes on one machine - You can run software that might not be compatible with your main OS - It's helpful for testing and setting up a new OS - VMs are used **A LOT** in those big server rooms and professional environments ------------------------------------------------------------------------- ### How do I do this on my own laptop then? ------------------------------------------------------------------------- there's a lot of *virtualization* software out there, but we'll be using VirtualBox today ------------------------------------------------------------------------- It's free, and it's pretty easy to use ------------------------------------------------------------------------- you can download it [here](https://www.virtualbox.org/wiki/Downloads) ------------------------------------------------------------------------- if you already know all of this just wait we have more stuff after this ------------------------------------------------------------------------- when you open VirtualBox, create a new VM like this: Create a new VM ------------------------------------------------------------------------- then choose a name and select the image to use for the OS Choose an image I'll be using Ubuntu 24.04, if you want to use another linux distro you probably know how to do this already ------------------------------------------------------------------------- now, select how much memory and CPU you want to allocate to the new VM Allocate memory and CPU The defaults you get are fine for this demo ------------------------------------------------------------------------- and finally, choose how much storage you want to give the VM Allocate storage 10GB is enough for now, you can use more if you want ------------------------------------------------------------------------- ### Click "Finish" and now you got your new VM!! ------------------------------------------------------------------------- we still need to install the operating system but that's easy enough ------------------------------------------------------------------------- *live demo in progress\* ------------------------------------------------------------------------- ### Now on to the next part (it gets better) ------------------------------------------------------------------------- you probably saw how many resources it takes to run a VM ------------------------------------------------------------------------- what if I want to only run a single app without all the overhead?? ------------------------------------------------------------------------- ### Containers to the rescue!! ------------------------------------------------------------------------- containers are kind of like VMs, but much lighter ------------------------------------------------------------------------- instead of emulating an entire computer, they just run the OS ------------------------------------------------------------------------- ### Why use VMs then? ------------------------------------------------------------------------- - VMs are more secure - they're more isolated from the host system - not limited to running the same OS as the host ------------------------------------------------------------------------- ### How do I use containers? ------------------------------------------------------------------------- one of the most popular container platforms is Docker ------------------------------------------------------------------------- rn we will use it on the VM we just created ------------------------------------------------------------------------- the commands we will need to install Docker: ``` curl -fsSL https://get.docker.com -o get-docker.sh`` sudo sh get-docker.sh ``` -------------------------------------------------------------------------