k8s part 1 (architecture)

Question 1

what are worker nodes in k8s?

Answer 1

These are the physical servers where the containers will be running.

Question 2

How many ways can a k8s master receive commands from the user?

Answer 2

Through API CLI and GUI

Question 3

what is kubectl in k8s?

Answer 3

It is a command line tool that allows you to run commands against a k8s cluster.

Question 4

what are the things you need before you start running kubectl commands against a k8s master?

Answer 4

you need the kubectl binary, a kube config file

Question 5

what is the function of the api server?

Answer 5

Responsible for exposing the k8s API, it acts as the entry point for the entire cluster.

Question 6

what is the function of ETCD?

Answer 6

Used for storing all the configuration data of the cluster.

Question 7

what is the function of the scheduler?

Answer 7

Component on the master that selects nodes for pods to run on.

Question 8

what is the function of the controller manager?

Answer 8

watches the state of the cluster through the API server and makes changes so that the desired state matches the current state.

Question 9

what is the function of the cloud controller manager?

Answer 9

It allows Kubernetes to interact with the underlying cloud provider.

Question 10

what is the function of the kubelet in a worker node?

Answer 10

Its primary role is to ensure that containers are running in the pods as expected.

Question 11

what is the function of the kube-proxy in a worker node?

Answer 11

Kube-proxy is a critical component of Kubernetes responsible for maintaining network communication between the pods.

Question 12

what is the function of the container runtime in a worker node?

Answer 12

It is the software responsible for running containers. eg docker, containerd,

Question 13

what is a k8s object?

Answer 13

It is a record of intent that you pass to the k8s cluster.