50 Kubernetes Concepts Every Devops Engineer Should Know Updated Free Pdf Jun 2026

Automatically adjusts the size of the Kubernetes cluster by adding or removing nodes based on pending pods and resource constraints.

🚀 The Ultimate DevOps Kubernetes Checklist (50 Key Concepts)

Memorization is the first step. Application is the second.

A declarative state provider for Pods and ReplicaSets. It manages rolling updates, rollbacks, and scaling of stateless applications. Automatically adjusts the size of the Kubernetes cluster

: A secondary container in a Pod that enhances the primary container (e.g., a logging proxy). Init Container : Runs and completes before the main app container starts. Roadmap.sh Networking and Service Discovery How applications talk to each other and the outside world. Service (ClusterIP) : Internal-only IP for communication within the cluster. Service (NodePort) : Exposes the service on a static port on each Node’s IP. Service (LoadBalancer) : Provisions a cloud provider's external load balancer.

A piece of storage in the cluster that has been provisioned by an administrator or dynamically provisioned using Storage Classes.

To help refine this guide or tailor it to your learning goals, let me know: A declarative state provider for Pods and ReplicaSets

Similar to ConfigMaps but specifically designed to hold sensitive data like passwords, OAuth tokens, and SSH keys, obfuscating them using Base64 encoding. 33. Persistent Volumes (PV)

: A policy to constrain resource allocations (to Pods or Containers) in a namespace.

A lightweight, standalone, executable package of software that includes everything needed to run an application. Init Container : Runs and completes before the

A method of regulating access to computer or network resources based on the roles of individual users within an enterprise (using Roles, ClusterRoles, RoleBindings, and ClusterRoleBindings).

: Allows administrators to describe the "classes" of storage they offer.

Allows you to define your own resource types, extending the Kubernetes API with domain-specific objects. CRDs follow the same patterns as built-in resources but are defined by you.