Module 2ac - Exploring Azure Core Products - Compute, Containers and K8s

Question 1

What are Azure Container Instances?

Answer 1

PaaS Offering; the fastest and simplest way of running a Container in Azure without any VMs or additional Services.

Question 2

What are Azure Container Instances (ACI) and Azure Kubernetes Service (AK8s) used for?

Answer 2

They are Serverless Compute resources that you use to deploy and manage CONTAINERS.

Question 3

General Knowledge: What are Containers?

Answer 3

A virtualized environment where an application and its dependencies are deployed as a single unit to a host

Question 4

What are five (5) advantages of using Containers?

Answer 4

• Multiple Containers can run on a single Host - either a physical or virtual host
• Virtualized OS - while VMs virtualize the hardware, Containers virtualize the Operating System
• Lightweight
• Designed for Dynamic Scaling
• Faster restart times - faster than VMs w.r.t. disaster recovery scenarios

Question 5

General Knowledge: Wrt Containers, what is an Orchestration?

Answer 5

An Orchestration is the task of automating, managing and interacting with a large number of Containers

Question 6

When would you want to use Containers over VMs?

What’s the limitation on VMs that influences this decision?

Answer 6

When you want to run multiple instances of an application on a single host machine.

The limitation of a VM is that they are limited to a single OS per virtual machine.

Question 7

General Knowledge: Whats the one major advantage of using Containers and K8s?

Answer 7

The main advantage of using Containers and K8s is you can run multiple instances of a containerized app on a single host machine

Question 8

General Knowledge: What is Kubernetes (K8s)?

Answer 8

K8s is a Container management automation application + API that manages the placement of Pods

Question 9

What is Azure Kubernetes Service (AK8s)?

Answer 9

K8s is an orchestration Service for Containers with distributed architectures and large volumes of Containers.

Question 10

General Knowledge: What are four (4) ways K8s manages Clusters (of pods/nodes/Containers)?

Answer 10

• Move affected workloads to another Node in the Cluster should a Node be removed
• Staggered deployment updates
• Rollback in case of deployment errors
• Support for various network plugins (load balancing, network isolation, policy driven security, communication, etc)

Question 11

Hint: Swarms

General Knowledge: Give two (2) capabilities of a K8s Pod

Answer 11

Just like Docker Swarms:

• If a Pod crashes, K8s can create a new instance of it
• Pods can be scaled manually or automatically

Question 12

General Knowledge: What are K8s Pods?

Answer 12

Pods are one or more Containers on a Kubernetes Cluster Node

Question 13

General Knowledge: What is a Microservices architecture?

Answer 13

Patterns to simplify an application’s architecture by creating smaller, manageable, autonomous and independently deployed web services that address a SINGLE business domain/capability.

You usually build a collection of microservices, each implementing a SINGLE business capability

The service is managed usually by a single development team and can be tech stack agnostic, meaning the team can decide what tech best suites its needs