Kubernetes Clusters

Question 1

What is a Kubernetes cluster?

Answer 1

A collection of nodes managed by one or more master nodes.

Question 2

Why are multiple nodes needed in a cluster?

Answer 2

To provide failover, redundancy and load balancing.

Question 3

How does the node communicate with each other

Answer 3

Via the kubelet process.

Question 4

How does the node communicate with the master node

Answer 4

VIA the API server

Question 5

How many cluster types are there

Answer 5

4 types.
All-In-One Single-Node
Single Master Node
Multi-Master Node
Full Multi-Node

Question 6

Describe the features of All-In-One Single-Node

Answer 6

Single etcd, single master node, single worker node. Usage: Perfect for learning or lab environment, should not be used in a production environment.

Question 7

Describe the features of Single Master Node

Answer 7

Single etcd, single master node, multiple worker nodes. Features: Single point of failure, cluster fails when master node fails
Multiple workers allow distributed workloads and load-balancing

Question 8

Describe the features of Multi-Master node

Answer 8

Single etcd, multiple master nodes, multiple worker nodes. Features: High availability of master, redundancy, load balancing
The etcd cluster remains present on only one of the masters (or external servers)

Question 9

Describe the features of Full-Multi-Node

Answer 9

multiple etcd, multiple master nodes, multiple worker nodes. Features: Full high-availability cluster, redundancy, load balancing.