Kubernetes 2 - LAB/in Practice

Question 1

What is Minikube?

Answer 1

A version of Kubernetes (That was uses in labs)

Question 2

What is kubectl?

Answer 2

The command line tool to interact with a kubernates cluster

Question 3

What are Pods?

Answer 3

The smallest deployable unit of computing.
They hold:
- one or more containers.
- storage resources.
- a unique network IP
- options for how containers should run.

Question 4

What is the command for viewing the running pods of a system?

Answer 4

kubectl get pods --namespace=kube-system

Question 5

What is a deployment in Kubernates?

Answer 5

It is a High-level concept that manages Pods
- Allows for easy updates and roll-backs and ensures a certain number of pods are always running

Question 6

What does services allow us to do?

Answer 6

Allows us to create a unique, presistant IP address and domain names for a deployment.

Question 7

what does the command minikube kubectl get nodes do?

Answer 7

Views all the nodes in the cluster

Question 8

What does the command minikube kubectl get pods do?

Answer 8

lists all the running pods

Question 9

What is a Pod?

Answer 9

Its the smallest unit of deployment.
Its a group of one or more containers, with a shared storage and network resources

Question 10

What is the Purpose of -- in the command
minikube kubectl -- run nginx --image=nginx

Answer 10

-- serves as a separator between minikube kubectl and the arguments that should be passed to the kubectl command.

minikube kubectl: tells minikube to run the kubectl command in the context of the Minikube cluster
--: indicates that what follows should be passed directly to kubectl without any interpretation by Minikube
run nginx --image=nginx: this is the actual kubectl command and its arguments. It instructs kubctl to create a new deployment named nginx using the nginx image.

without the -- separator, Minikube might try to interprete the arguments as its own options, which could lead to errors.

Question 11

How do you start minikube?

Answer 11

minikube start
This creates a Clustor

Question 12

How do you check the status of Minikube?

Answer 12

minikube status

Question 13

How does kubectl work?

Answer 13

It comunicates with the cluster’s API server via HTTPS.

Question 14

How would you ssh intoyour minikube VM?

Answer 14

minikube ssh
You are now inside the minikube node

Question 15

How would you create/run a pod on a nginx server?

Answer 15

minikube kubectl run nginx --image=nginx

Question 16

How would you get more information on a pod?

Answer 16

minikube kubectl describe pod <pod name>

Question 17

How would you delete a pod?

Answer 17

minikube kubectl delete pod <pod name>

Question 18

How would you create a deployment?

Answer 18

kubectl create deployment <app-deployment-name> --image=<image_name>

Question 19

What does kubectl expose deployment nginx-deployment --port=8085 --target-port=80 do?

Answer 19

This is a service that creates a unique ip address for a deployment.
port and target-port arguments map port 80 in the nginx pods to port 8085 on the services