Kubernetes

Question 1

Control Plane elements

Answer 1

• Controller Manager
• Scheduler
• etcd
• API Server

Question 2

Kubernetes abbreviation

Answer 2

k8s

1. k
2. ubernete (8 letters)
3. s

Question 3

Kubernetes has origin on…

Answer 3

Google’s internal container orchestration BORG (Proprietary 2003-2004)

Google open-sourced a version of this work, creating Kubernetes.

Question 4

etcd

Answer 4

It is a distributed key-value store

• Stores clusters persistent states
• It is used by other control plane elements to store and retrieve informations about clusters

Question 5

scheduler

Answer 5

• Is responsible to schedule pods into the worker nodes in a cluster
• It uses informations about resources required by the pods and the available resources on the worker nodes to make placement decisions

Question 6

controller manager

Answer 6

• Is responsible for running controllers that manages the state of a cluster
• Examples:
  Replication controller: Ensures that desired number of replicas of a pod are running
  Deployment controller: Manages the rolling updates and rollback of deployments.

Question 7

Worker Nodes Core Components

Answer 7

• kubelet
• container runtime
• kube-proxy

Question 8

kube-proxy

Answer 8

• Responsible for communicating with the Control Plane
• Receives instructions coming from about which pods to run on the node
• Ensures that the desired states of the pods are maintained.

Question 9

container runtime

Answer 9

• Run the container on the worker nodes
• It is responsible to pull the container images from a registry
• Start and stopping the containers
• Managing the container resources

Question 10

kube-proxy

Answer 10

• Is a network proxy that runs on each worker node
• Responsible for routing the traffic to the correct pods
• Provides load balancing between the pods ensuring traffic is distributed evenly across the pods.