Google Kubernetes Engine

Question 1

Google Kubernetes Engine (GKE)

Answer 1

Managed Kubernetes service

Question 2

GKE Cluster :

Answer 2

Group of Compute Engine instances:
1. Master Node(s) - Manages the cluster
2. Worker Node(s) - Run your workloads (pods)

Question 3

Master Node (Control plane) components :

Answer 3

1. API Server - Handles all communication for a K8S cluster (from nodes and outside)
2. Scheduler - Decides placement of pods
3. Control Manager - Manages deployments & replicasets
4. etcd - Distributed database storing the cluster state

Question 4

Worker Node components :

Answer 4

Runs your pods
–> Kubelet - Manages communication with master
node(s)

Question 5

Kubernetes - Pods

Answer 5

Smallest deployable unit in Kubernetes

Question 6

A deployment is created for each microservice:

Answer 6

–> Deployment represents a microservice (with all its releases)
–> Deployment manages new releases ensuring zero downtime

Question 7

Replica set

Answer 7

ensures that a specific number of pods are
running for a specific microservice version

Question 8

ClusterIP:

Answer 8

Exposes Service on a cluster-internal IP
–> Use case: You want your microservice only to be available inside the cluster (Intra cluster communication)

Question 9

LoadBalancer:

Answer 9

Exposes Service externally using a cloud provider’s load balancer

Question 10

NodePort:

Answer 10

Exposes Service on each Node’s IP at a static port (the NodePort)

Question 11

StatefulSet -

Answer 11

Set of Pods with unique, persistent identities and stable hostnames

Question 12

DaemonSet -

Answer 12

One pod on every node! (for background services)