AWS Cloud Developer: Orchestration with Kubernetes

Question 1

Orchestration

Answer 1

Orchestration is the automated management of the lifecycle of our application

Question 2

Kubernetes

Answer 2

A container orchestration system packed with features for automating our application’s deployment
Enables us to easily scale our application and ship new code

Question 3

Pods

Answer 3

A set of containers that are deployed together

Containers often need to communicate with one another. It’s not uncommon to see a deployment involving a few containers to be deployed.
Kubernetes pods are abstractions of multiple containers and are also ephemeral.

Question 4

Services

Answer 4

Applications are often deployed with multiple replicas. This helps with load balancing and horizontal scaling.

Services are an abstraction of a set of pods to expose them through a network

Question 5

Load Balancing

Answer 5

Handling traffic by distributing it across different endpoints

Question 6

Replica

Answer 6

A redundant copy of a resource often used for backups or load balancing

Question 7

Round Robbin Load Balancing

Answer 7

Round‑robin load balancing is one of the simplest methods for distributing client requests across a group of servers. Going down the list of servers in the group, the round‑robin load balancer forwards a client request to each server in turn. When it reaches the end of the list, the load balancer loops back and goes down the list again (sends the next request to the first listed server, the one after that to the second server, and so on).

Question 8

Main benefit of Round Robin load balancing

Answer 8

The main benefit of round‑robin load balancing is that it is extremely simple to implement. However, it does not always result in the most accurate or efficient distribution of traffic, because many round‑robin load balancers assume that all servers are the same: currently up, currently handling the same load, and with the same storage and computing capacity.

Question 9

2 types of Round Robbin Load-balancing algorithms that take additional factors such as machine type and resources into account

Answer 9

Weighted round robin – A weight is assigned to each server based on criteria chosen by the site administrator; the most commonly used criterion is the server’s traffic‑handling capacity. The higher the weight, the larger the proportion of client requests the server receives. If, for example, server A is assigned a weight of 3 and server B a weight of 1, the load balancer forwards 3 requests to server A for each 1 it sends to server B.

Dynamic round robin – A weight is assigned to each server dynamically, based on real‑time data about the server’s current load and idle capacity.

Question 10

Amazon EKS

Answer 10

Amazon Elastic Kubernetes Service (Amazon EKS) gives you the flexibility to start, run, and scale Kubernetes applications in the AWS cloud or on-premises.

Question 11

CMD: Create a kubeconfig automatically

Answer 11

aws eks –region update-kubeconfig –name

Question 12

CMD: Check kubeconfig configuraiton

Answer 12

kubectl get svc

Question 13

What three dependencies needs to be installed and setup in order to interact with kubernetes cluster?

Answer 13

Install kubectl
Set up aws-iam-authenticator
Set up kubeconfig

Question 14

CMD: Loading yaml file

Answer 14

kubectl apply -f deployment.yaml

Question 15

CMD: kubectl show pods in the cluster

Answer 15

kubectl get pods

Question 16

CMD: kubectl show services in the cluster

Answer 16

kubectl describe services

Question 17

CMD: kubectl display information about the cluster

Answer 17

kubectl cluster-info

Question 18

Cluster

Answer 18

A group of resources that are connected to act as a single system

Question 19

CMD:Kubectl To attach to a container in a pod for debugging

Answer 19

kubectl exec -it {pod_name} /bin/bash

Question 20

What’s the difference between a Service and a Deployment in Kubernetes?

Answer 20

A deployment is responsible for keeping a set of pods running. A service is responsible for enabling network access to a set of pods.

Question 21

CMD: bind eks cluster to kubctl

Answer 21

aws eks –region ap-southeast-1 update-kubeconfig –name simple_node