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Chapter 9 - Virtual Machines
Chapter 9.14 - VM CheatSheet

AZ-104 Certification Notes

Chapter 9.14 - VM CheatSheet

Virtual Machines CheatSheet

  • Azure Virtual Machines (VMs) allows you to create Linux and Windows virtual machines
  • The size of the virtual machine is determined by the image
    • The image defines the combination of vCPUs, Memory, and Storage Capacity
  • The current limit on a per subscription basis is 20 VMs per region
  • Azure VMs are billed at an hourly rate
  • A single instance VMs has an availability of 99.9% (when all storage disks are premium)
  • Two instances deployed in Availability Set will give you 99.95% availability
  • You can attach multiple Managed Disk to your Azure VMs
  • When you launch an Azure Virtual Machine other networking components will be either created or associated to your Virtual Machine
    • Network Security Group (NSG), Network Interface (NIC), Public IP Address, VNet
  • Azure VMs come in a variety of sizes that are also optimized for specific use cases
    • General Purpose, Compute Optimized, Memory Optimized, Storage Optimized, GPU, High Performance Compute
  • Azure Compute Unit (ACU) provides a way of comparing (CPU) performance across Azure SKUs
  • ACU is currently standardized on a Small (Standard_A1) VM with the value of 100
  • All other SKUs then represent approximately how much faster that SKU can run a standard benchmark
  • You can install the Azure Mobile App, and you can monitor your VMs on the go
  • Hyper-V is Microsoft's hardware virtualization product.
    • It lets you create and run a software version of a computer, called a virtual machine
  • There are two generations of Hyper-V VMs:
    • Generation 1 - Support most guest operating systems
    • Generation 2 - Support most 64-bit versions of Windows and more current versions of Linux and FreeBSD operating systems
  • Hyper-V VMs are packaged into Virtual Hard Disk formats: VHD or VHDX files
  • There are 3 ways to connect to your Virtual Machines
  • Secure Shell (SSH) to connect via a terminal or SSH client eg. PuTTy
    • SSH happens on Port 22 via TCP
    • RSA Key Pairs are commonly used to authorize access
  • Remote Desktop Protocol (RDP) a graphical interface to connect to another computer over a network connection
    • This is how you can remotely connect to Windows Server via Virtual Desktop
    • RDP happens on Port 3389 via TCP and UDP
  • Azure Bastion a service you deploy that lets you connect to a virtual machine using your browser and the Azure Portal
    • Supports both SSH or RDP, useful when you only have access to a browser like a Chromebook, or do not have permission to configure or install software
  • Update Management allows you to manage and install operating system updates and patches for both Windows and Linux virtual machines that are deployed in Azure, on-premises, or in other cloud providers
    • Update Management will perform a scan for update compliance
    • A compliance scan is by default, performed every 12 hours on Windows and every 3 hours on Linux
    • It can take between 30 minutes and 6 hours for the dashboard to display updated data from managed computers
Chapter 9.13 - Update ManagementChapter 10 - Introduction