What are the components of Kubernetes master and explain each component’s function?

The Kubernetes master runs the Scheduler, Controller Manager, API Server and etcd components and is responsible for managing the Kubernetes cluster.


Etcd is a distributed, consistent key-value store used for configuration management, service discovery, and coordinating distributed work.

API Server

When you interact with your Kubernetes cluster using the kubectl command-line interface, we are actually communicating with the master API Server component.


The Scheduler watches for unscheduled pods and binds them to nodes via the /binding pod subresource API, according to the availability of the requested resources, quality of service requirements, affinity and anti-affinity specifications, and other constraints.

Controller Manager

The Kubernetes Controller Manager is a daemon that embeds the core control loops (also known as “controllers”) shipped with Kubernetes.