What is Kubernetes?
A portable, extensible, open-source platform for managing containerized workloads and services, that facilitates both declarative configuration and automation. It has a large, rapidly growing ecosystem. Kubernetes services, support, and tools are widely available.
Ports:
| Protocol | Direction | Port Range | Purpose | Used By |
|---|---|---|---|---|
| TCP | Inbound | 6443 | Kubernetes API server | All |
| TCP | Inbound | 2379-2380 | etcd server client API | kubi-apiserver, etcd |
| TCP | Inbound | 10250 | Kubelet API | Self, Control Plane |
| TCP | Inbound | 10255 | Kubelet ReadOnly | Self |
| TCP | Inbound | 10259 | kube-scheduler | Self |
| TCP | Inbound | 10257 | kube-controller-manager | Self |
| TCP | Inbound | 8443 | Minikube API server | Self |
Node - A node is a worker machine in Kubernetes.
Pod - The smallest and simplest Kubernetes object. A Pod represents a set of running containers on your cluster.
Cluster - A set of worker machines, called nodes, that run containerized applications. Every cluster has at least one worker node.
Container- A lightweight and portable executable image that contains software and all of its dependencies.
Service- An abstract way to expose an application running on a set of Pods as a network service.
ServiceAccount- Provides an identity for processes that run in a Pod.
API server - Also known as: kube-apiserver The API server is a component of the Kubernetes control plane that exposes the Kubernetes API. The API server is the front end for the
Kubectl - Command line tool for communicating with a Kubernetes cluster's control plane, using the Kubernetes API.
Control Plane- The container orchestration layer that exposes the API and interfaces to define, deploy, and manage the lifecycle of containers.
Secret - used to store secret data in base64 format. all confidential data will be in it.
Volume- A directory containing data, accessible to the containers in a Pod.
**namespace-**In Kubernetes, namespaces provides a mechanism for isolating groups of resources within a single cluster.