Kubernetes Architecture

When you deploy Kubernetes, you get a cluster.

A cluster has 4 main components :

1. Kubernetes MASTER : also called a Control Plane (Master): manages global state and scheduling
2. WORKER nodes: run actual application workloads
3. Networking
4. Storage: persist data

Every cluster has at least one worker node.

1. Kubernetes Master (Control Pane)

• All commands to K8 cluster go to the master (say from cmd line tool like kubectl)
• Master is a collection of process that manages the global cluster state and scheduling. The node where these processes run is called the master.
• Mostly in cloud environments , master is a managed service and least important
• Fault Tolerance in Master

Master’s components

1. kube-apiserver
2. etcd
3. kube-scheduler
4. kube-controller-manager
5. cloud-controller-manager