Quiz 2

Question 1

What is Borg?

Answer 1

Googles internal container orchestration framework

Question 2

What is Kubernetes?

Answer 2

An open source version of Borg

Question 3

What are some infrastructures that Kubernetes supports?

Answer 3

Public clouds, Private Clouds, On-premises, Bare-metal

Question 4

What is the goal of Kubernets?

Answer 4

Manage applications

Question 5

What is the etcd?

Question 6

What is stored in the etcd?

Answer 6

Key value pair
Cluster data, cluster state, consensus, configurations

Question 7

What is the kub-scheduler?

Answer 7

The main scheduler in kubernetes

Question 8

What are the 4 basic objects in Kubernets?

Answer 8

Pod, Volume, Service, Namespace

Question 9

What is a Pod in Kubernets?

Answer 9

The basic deployment unit

Question 10

What does a pod contain?

Answer 10

One or multiple (different) containers

Question 11

What is Co-scheduling?

Answer 11

When containers in a pod are scheduled together

Question 12

Containers in a pod share what?

Answer 12

IP/Port
Disk volume

Question 13

How do containers communicate?

Answer 13

Via localhost

Question 14

What are the three multi-container models in pods?

Answer 14

Sidecar containers
Ambassador containers
Adapter Containers

Question 15

What is a Sidecar container?

Answer 15

A container thats meant as a helper

Question 16

What is an ambassador container?

Answer 16

A proxy container

Question 17

What is an Adapter Container?

Answer 17

A standardization or common interface container

Question 18

What is Volume?

Answer 18

A persistent storage for a pod

Question 19

What is a Service?

Answer 19

A logical group of pods that work together

Question 20

What are some attributes of a service?

Answer 20

They have a virtual IP, port and DNS

Question 21

What are the two groups of Services?

Answer 21

Labels and slecectors

Question 22

What are Namespaces?

Answer 22

Logical slices of Kubernets clusters

Question 23

What are Labels used in?

Answer 23

Pod selection

Question 24

What are Selectors used for?

Answer 24

To select a certain section of a pod

Question 25

What do controllers do?

Answer 25

Create and manage the four objects, Pods, Volumes, Services and Namespaces

Question 26

What are the two sections of autoscaling in Kubernetes?

Answer 26

Pod Autoscaler and Cluster Autoscaler

Question 27

What are the three Pod autoscalers?

Answer 27

Horizontal, Vertical and Multidimensional

Question 28

What is Prometheus?

Answer 28

A 3rd party framework used to monitor container orchestration

Question 29

What type of data model does Prometheus have?

Answer 29

A time series data model

Question 30

What is the worse case scenario for a service provider?

Answer 30

An unpredictable traffic spike

Question 31

What is the average resource utilization of cloud instances?

Answer 31

20-30%

Question 32

What are the two main ideas behind serverless computing?

Answer 32

What if a smaller unit of computing can be used, what if the computing unit can be scaled out independently

Question 33

Why did people make server less computing?

Answer 33

To reduce over provisioning, and gain a more fine grained way of provisioning resources

Question 34

How fast is server less computing?

Answer 34

less than 100ms

Question 35

What is a Cold Start?

Answer 35

The first execution of a serverless function

Question 36

What is a Warm start?

Answer 36

When your function is already deployed and has a container running the memory

Question 37

What is the main motivation for employing timeouts in server less computing?

Answer 37

To avoid wasting resources

Question 38

What is the relationship between cold and hot starts in server less computing

Question 39

Is serverless computing cheap or expensive?

Answer 39

Expensive

Question 40

What are some good things about serverless computing?

Answer 40

Avoids over provisioning No infrastructure management Underlying infrastructure is hidden Scalable A true on demand cost Near unlimited computing resources

Question 41

What are some bad things about serverless computing?

Answer 41

New technology Limited resources and execution duration Vendor lock in Stateless

Question 42

What are some good use cases for serverless computing?

Answer 42

Reactive web service Web cralwer API GW Environment Automation Event driven processing Data Transformation

Question 43

What are some bad use cases for server less computing?

Answer 43

Long running jobs Any jobs requiring a large amount of resources Stateful or Block processes

Question 44

What are some open questions for serverless computing?

Answer 44

Can you write a large app with many functions What is the cost Can a single function be debuged