50 Kubernetes Concepts Every Devops Engineer Should Know !!hot!! | Free Pdf
| Category | Key Concepts | Real-World Value | Primary Role | | :--- | :--- | :--- | :--- | | | Pods, Services, Deployments, Namespaces | Stable baseline for all app deployments | All Roles | | Networking | Ingress, Network Policies, Service Mesh | Fine-grained traffic control and security | Platform/SRE | | Storage | Volumes, StatefulSets, CSI | Persistent data for databases and stateful apps | Platform/DevOps | | Security | RBAC, Secrets, PSP (or PSS) | Zero-trust access control and secrets management | Security/DevOps | | Operations | HPA, VPA, Cluster Autoscaler | Dynamic, cost-optimized, and efficient scaling | SRE/DevOps | | Application | Jobs, CronJobs, Operators | Automated batch tasks and complex application management | Developer/DevOps | | GitOps/CI-CD | Argo CD, Flux, Helm | Automated, auditable, and declarative application delivery | DevOps/SRE | | Observability | Prometheus, Grafana, OpenTelemetry | Deep system insight, faster troubleshooting, and alerting | All Roles |
Agent on each node ensuring containers are running. 9. Kube-proxy: Handles networking on nodes. 10. Container Runtime: (e.g., Docker, Containerd). 2. Application Deployment & Workloads 11. Pods: The smallest deployable unit. 12. ReplicaSets: Ensures a set number of pod replicas. 13. Deployments: Declarative updates for Pods/ReplicaSets.
Automatically adjusts the CPU and memory reservations for your pods to optimize resource utilization.
A provides internal load balancing within the cluster and can also expose an external IP (via LoadBalancer or NodePort ). An Ingress acts as a smart router, managing external access to multiple services based on rules like URL paths or hostnames.
The maximum amount of CPU and memory a container is allowed to consume. It prevents a single container from starving others on the same node. | Category | Key Concepts | Real-World Value
A request for storage by a user or Pod. It specifies size, access modes (like ReadWriteOnce), and specific storage types.
Today, we break down the every DevOps engineer must know. Best of all, you can download a beautifully formatted, free PDF version of this list at the end of this article —perfect for offline study or sharing with your team.
Optimizing performance, prioritizing workloads, and growing your cluster automatically. 32. Namespaces
Ensures that all (or some) nodes run a copy of a specific Pod. This is typically used for log collection (like Fluentd) or node monitoring agents. Application Deployment & Workloads 11
Determines if a container needs to be restarted. If a liveness probe fails, Kubernetes kills the container and starts a new one.
: Key-value pairs used for selecting and filtering resources.
Specialized containers that run to completion before app containers start in a Pod. They typically isolate setup scripts or prerequisite tools.
Explore the code examples in the official Packt GitHub repository . useful for dividing environments (e.g.
An agent that runs on each node in the cluster, ensuring that containers are running properly inside their assigned Pods.
Scheduling & workloads 11. Scheduler — assigns pods to nodes. 12. Taints & Tolerations — node-level pod placement constraints. 13. NodeSelector & NodeAffinity — node selection rules. 14. PodAffinity & PodAntiAffinity — co-location rules. 15. Resource requests & limits — CPU/memory guarantees and caps. 16. QoS classes — BestEffort/Burstable/Guaranteed. 17. Horizontal Pod Autoscaler (HPA) — scale pods by metrics. 18. Vertical Pod Autoscaler (VPA) — adjust pod resource requests. 19. Custom Resources & Operators — extend API and manage apps. 20. InitContainers — setup containers that run before app containers.
A mechanism to isolate groups of resources within a single cluster, useful for dividing environments (e.g., development, staging, production) or teams.
The flexible preference. A set of rules that gives you granular, soft, or hard control over which Nodes your Pods prefer to be scheduled on. 42. Taints and Tolerations