Kubernetes

Question 1

What is a Pod ?

Answer 1

Applications are deployed as Pods onto a worker node of a cluster. The Pods can contain single or multiple Docker containers

Question 2

What is a Deployment ?

Answer 2

A Deployment is an object that manages the life cycle of a stateless, replicated application. Each replica is represented by a Pod. The replicas are distributed among the nodes of a cluster for better resilience

Question 3

What is a Worker Node ?

Answer 3

A worker node can be either a physical or virtual machine on which you can run Pods

Question 4

What is a Cluster ?

Answer 4

A cluster is an abstraction to manage a group/set of worker nodes together. A cluster has a Control Plane and has one or more Worker Nodes

Question 5

What is Tilt ?

Question 6

What is Octant ?

Question 7

What is a Kubernetes Manifest ?

Answer 7

A Manifest file is a yaml file that describes a Deployment. It usually comprises of four sections
1. apiVersion - this the version of the schema to be used to define this object
2. kind - the kind or type of Kubernetes object that you want to create - e.g. Pod, ReplicaSet, Deployment or Service
3. metadata - details about the Object that you want to create inc. key/value pairs
4. spec - a configuration section

Question 8

What is a Control Plane ?

Answer 8

A Control Plane is that part of the Cluster that exposes, by way of an API, a means to define, deploy and manage the life cycle of Pods. It comprises all the essential elements that implement orchestration, cluster management, scheduling and health monitoring.

Question 9

How to start a new minikube cluster ?

Answer 9

$minikube start --cpus 2 --memory 3g --driver docker --profile polar

Question 10

How do you list all of the Worker Nodes in the cluster ?

Answer 10

$kubectl get nodes
shows a single Worker Node which hosts the Control Plane aswell as acting as a worker node

Question 11

How do you see the available clusters with which you can interact ?

Answer 11

$kubectl config get-contexts
to show all the clusters available to interact with

Question 12

How to determine current context ?

Answer 12

$kubectl config current-context

Question 13

How to switch to specific context ?

Answer 13

kubectl config use-context polar

Question 14

How to stop a cluster ?

Answer 14

minikube stop --profile polar

Question 15

What is a ReplicaSet ?

Answer 15

Question 16

kubectl - imperative

Question 17

kubectl - declarative

Question 18

persistent volumes

Question 19

pods

Question 20

PVC

Question 21

replicasets

Question 22

secrets

Question 23

loadbalancers

Question 24

deployments

Question 25

initcontainers

Question 26

annotations

Question 27

node port service

Question 28

probes

Question 29

canary deployments

Question 30

cluster ip service

Question 31

requests & limits

Question 32

external name service

Question 33

namespaces

Question 34

vpa

Question 35

ingress service

Question 36

limit range

Question 37

daemon sets

Question 38

ingress ssl

Question 39

resource quota

Question 40

fluentd for logs

Question 41

ingress & external dns

Question 42

storage classes

Question 43

config maps