Deploy and manage Azure compute resources

Question 1

What are the three maintenance planning events?

Answer 1

unplanned hardware maintenance, unexpected downtime, planned maintenance

Question 2

unplanned hardware maintenance

Answer 2

azure detects the hardware your software is running on is about to go kaput. Azure will move your stuff over to a healthy machine

Question 3

unexpected downtime

Answer 3

When stuff goes kaput but azure didn’t detect it ahead of time.

Question 4

planned maintenance

Answer 4

periodic updates by microsoft

Question 5

what is an availability set?

Answer 5

groups vms into a set so they can be deployed together. ensures they are not all upgraded at the same time

Question 6

What are the availability set characteristics?

Answer 6

They all do the same thing, they all have the same software, they are spread out so a localized software failure won’t affect all of them, you attach a vm to an availability set upon creation

Question 7

What are the 4 methods to create availability sets?

Answer 7

azure portal, arm templates, scripting, api tools

Question 8

what is an update domain?

Answer 8

a number of nodes that are upgraded together. You wouldn’t want all of your vms in the same update domain

Question 9

what is a fault domain?

Answer 9

nodes that are physicallly close together. if there is a failure, all nodes in a fault domain are likely to be affected.

Question 10

What are the characteristics of availability zones?

Answer 10

unique physical locations within an azure region, will have one or more datacenters inside, minimum of 3 within a region

Question 11

What is vertical scaling?

Answer 11

when you make a virtual machine more or less powerfull

Question 12

what is horizontal scaling?

Answer 12

adding or subtracting virtual machines

Question 13

What are the three characteristics of virtual machine extensions?

Answer 13

They are manageable from the cli, PowerShell, arm templates, and the portal. They can be bundled with a new VM deployment or run against any existing system. There are different extensions for Windows and Linux machines. there are also more unofficial extensions

Question 14

What is the purpose of virtual machine extensions?

Answer 14

They are scripts that can automate the tasks of creating, maintaining, and removing virtual machines

Question 15

What are custom script extensions for?

Answer 15

They can be used to automatically launch and execute virtual machine customization tasks

Question 16

What is desired state configuration?

Answer 16

A management platform in windows powershell. It enables deploying and managing configuration data for software services and managing the environment in which these services run

Question 17

What is an app service plan?

Answer 17

app service plan defines a set of compute resources for a web application to run

Question 18

What are the three app service plan settings?

Answer 18

Region, number of VM instances, Size of VM instances

Question 19

Which 3 app service plans support autoscaling?

Answer 19

standard, premium, and isolated

Question 20

Which 2 app service plans are for development and testing?

Answer 20

free and shared. Basic is better with more instances and 10 gb of space

Question 21

What are the basic configuration settings you need to create an app with app service?

Answer 21

name, publish (your code or a docker container), runtime stack (code language), operating system (win/linux), region, app service plan

Question 22

What are deployment slots for?

Answer 22

When you wanna switch over to a new version of your app or just try it out, you can use a deployment slot to deploy it instead of it replacing your in production app. You can also switch the prod slot with the deployment slot to avoid downtime.

Question 23

What are the three steps for creating a custom domain name?

Answer 23

Reserve your domain name, create DNS records to map the domain to your azure web app, enable the custom domain

Question 24

Why is storage an issue when using kubernetes?

Answer 24

pods and the containers within them and the applications within them are treated emphemerally by azure normally. So they get deleted. Some applications need to store data long-term so they need storage options

Question 25

What is the difference between aks azure disks and azure files?

Answer 25

disks are available to a single node, while files are shared across nodes and pods

Question 26

What is the difference between an aks volume and a persistent volume?

Answer 26

a normal volume only lasts as long as the pod it is servicing. A persistent volume can exist beyond the lifetime of an individual pod

Question 27

What are the two storage class types and their derivatives?

Answer 27

Default and file and they both have premium versions

Question 28

If unspecified, what is the default storage class chosen?

Answer 28

default (datadisk)

Question 29

What are the three aks scaling techniques?

Answer 29

manually scaling pods or nodes, autoscale pods, autoscale clusters

Question 30

How does autoscaling pods in aks work?

Answer 30

The horizontal pod autoscaler (HPA) monitors resource demands. it checks every 30 seconds by default. available on 1.8 or later

Question 31

How does autoscaling clusters in aks work?

Answer 31

The cluster autoscaler checks the API server every 10 seconds by default. available on version 1.10.x or later

Question 32

What should you use if the aks autoscaler is too slow?

Answer 32

rapid burst scaling

Question 33

What are the most common VM CLI subcommands?

Answer 33

create, deallocate, delete, list, open-port, restart, show, start, stop, update

Question 34

what are the 4 parameters of az vm create?

Answer 34

--resource-group, --name, --image, --location

Question 35

What resources are provisioned along with a virtual machine?

Answer 35

the vm itself, storage account, disk space, virtual network, network interface, and optionally a public IP address

Question 36

what size vm for general use?

Answer 36

B or D

Question 37

What size vm for heavy computational tasks?

Answer 37

F

Question 38

What size vm for large memory usage?

Answer 38

D, E, M, G

Question 39

What size vm for data storage and processing?

Answer 39

L

Question 40

What size vm for heavy graphics rendering?

Answer 40

N

Question 41

What size vm for high-performance computing?

Answer 41

H

Question 42

What are the two disks made along with the vm?

Answer 42

the OS disk and the temporary disk

Question 43

What are some advantages of managed disks?

Answer 43

increased reliability, better security, snapshot support, and backup support

Question 44

What are the 5 automated deployment options?

Answer 44

Azure DevOps, Github, Bitbucket, OneDrive, Dropbox

Question 45

What are the six manual deployment options?

Answer 45

Git, az webapp up, ZIP deploy, WAR deploy, Visual Studio, FTP/S

Question 46

Why does a set of VMs need to be in the same state?

Answer 46

If there's a configuration drift for each VM, you can end up with systems that are prone to failure because of incompatibilities in the setup

Question 47

What is powershell DSC and what is it for?

Answer 47

a declarative managment platform that azure automation state configuration uses to configure, deploy, and control systems.

Question 48

What is the LCM?

Answer 48

local configuration manager is a component of the windows management framework (wmf) on a Windows operating system. It updates the state of a node

Question 49

What are LCM push and pull mode?

Answer 49

Push: an admin sends configurations to some nodes. Each LCM makes sure that the states of all the nodes are identical. Pull Mode: Each LCM polls the pull server for the latest configs.

Question 50

What are a DSC codeblock's four sections?

Answer 50

Configuration, node, resource, and MyDscConfiguration