50 Kubernetes Concepts Every - Devops Engineer Should Know _verified_ Free Pdf
Introduction to Kubernetes Concepts
As a DevOps engineer, mastering Kubernetes is crucial for efficient container orchestration. Here are 50 key concepts to get you started: Introduction to Kubernetes Concepts As a DevOps engineer,
17. Static Pods
Pods managed directly by the Kubelet on a specific node, not the API server. Used for bootstrapping control plane components (like the API server itself). Pods – The smallest deployable unit
Part 1: The Building Blocks (Core Objects)
The absolute minimum you must know to deploy anything. Multi-tenancy and Federation
- Pods – The smallest deployable unit. One or more containers sharing network/storage.
- Deployments – Declarative updates for Pods and ReplicaSets. Handles rolling updates and rollbacks.
- ReplicaSets – Ensures a specified number of pod replicas are running at all times.
- StatefulSets – For stateful applications (databases). Provides stable, unique network identifiers and persistent storage.
- DaemonSets – Runs one copy of a pod on every node (e.g., log collectors, monitoring agents).
- Jobs – Runs a pod to completion (batch processing).
- CronJobs – Runs jobs on a time-based schedule.
- Services – Exposes a set of pods as a network service (ClusterIP, NodePort, LoadBalancer).
- Endpoints/Slice – Tracks which pods are actually behind a service.
- ConfigMaps – Decouple configuration artifacts from image content (env vars, config files).
- Secrets – Similar to ConfigMaps but for sensitive data (base64 encoded, but not encrypted by default).
- PersistentVolumes (PV) – Cluster-wide storage provisioned by an admin.
- PersistentVolumeClaims (PVC) – A request for storage by a user/pod.
- Namespaces – Virtual clusters within a physical cluster for team/environment isolation.
- Ingress – Manages external HTTP/S access to services (routing, SSL termination).
- NetworkPolicies – Firewall rules inside Kubernetes (pod-to-pod traffic control).
Multi-tenancy and Federation
- 27. Namespaces: Isolates resources for multiple teams
- 28. Resource Quotas: Limits resource usage for namespaces
- 29. Federation: Manages multiple clusters