08-Azure Virtual Machines

Question 1

IaaS Shared Responsibility

Answer 1

Responsibility always retained by customer

Responsibility varies by service type

Responsibility transfers to cloud provider

Question 2

Virtual Machine Planning

Answer 2

Start with the network

Name the virtual machine

Choose a location

Consider pricing

Question 3

Virtual Machine Storage

Answer 3

Each Azure VM has two or more disks

OS and data disks reside in Azure Storage accounts

When creating an Azure V, you can choose between managed and unmanaged disks

Question 4

Parameters to create Virtual Machine in Portal

Answer 4

Basics

Disks

Networking

Management

Advanced

Question 5

Virtual Machine Connections

Answer 5

Bastion Subnet for RDP/SSH through the Portal over SSL

Remote Desktop Protocol for Windows-based Virtual Machines

Secure Shell Protocol for Linux based Virtual Machines

Question 6

Windows VM Conections

Answer 6

Remote Desktop Protocol

WinRM

Question 7

Linux VM Connections

Answer 7

Authenticate with SSH public key or password

SSH is encrypted connection protocol that allows secure logins over unsecured connections

There are public and private keys

Question 8

Maintenance vs Downtime

Answer 8

Unplanned Hardware Maintenance

Unexpected Downtime

Planned Maintenance

Question 9

Unplanned Hardware Maintenance

Answer 9

When platform predicts a failure, it will issue an unplanned hardware maintenance event

Question 10

Unexpected Downtime

Answer 10

When a virtual machine fails unexpectedly

Question 11

Planned Maintenance

Answer 11

Events are periodic updates made to the Azure platform

Question 12

Availability Sets

Answer 12

Increase availability of Virtual Machine

Think as one single building with different racks, fault domains

Question 13

Update domains

Answer 13

Allow Azure to perform incremental or rolling upgrades across a deployment.

During planned maintenance, only one update domain is rebooted at a time

Question 14

Fault domains

Answer 14

Group of Virtual Machines that share a common set of hardware, switches, that share a single point of failure.

VMs in an availability set are placed in at least two fault domains

Question 15

Availability Zones

Answer 15

Unique physical locations in a region

Includes datacenters with independent power, cooling, networking

Protects from datacenter failures

Combines update and fault domains

Provides 99.99% SLA

Take a single building and combine with two other buildings, total at least three buildings

Question 16

Vertical scaling

Answer 16

increase or decrease power to a single instance of workload; usually manual

Question 17

Horizontal scaling

Answer 17

increase or decrease number of instances of a workload; frequently automated

Question 18

Implement Scale Sets

Answer 18

Instance count - # VMs in scale set (0 to 1000)

Instance size - size of each VM in scale set

Azure Spot Instance

Use managed disks

Enable scaling beyond 100 instances

Question 19

Implement Autoscale

Answer 19

Define a minimum, maximum, and default number of VM instances

Create more advanced scale sets with scale out and scale in parameters

Question 20

Virtual Machine Extensions

Answer 20

Small applications that provide post-deployment VM configuration and automation tasks

Managed with Azure CLI, PowerShell, Azure Resource Manager template

fill in

Question 21

Custom Script Extensions

Answer 21

Simple or complex

Has 90 minutes to run

Double check dependencies to ensure availability

Account for any errors that might occur

Protect/encrypt sensitive information

Question 22

Desired State Configurations

Answer 22

Configuration block(s) have a name

Node blocks define the computers or VMs that you are configuring

Resource block(s) configure the resource and its properties

There are many built-in configuration resources