Basic Kubernetes

Deploy workloads on Kubernetes: pods, services, storage, and autoscaling fundamentals.

Chapter 1: Kubernetes Fundamentals

Control plane schedules work; worker nodes run kubelet and container runtime.

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Pods are the smallest deployable unit; Services provide stable networking.

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API server, etcd, scheduler, and controller-manager coordinate cluster state.

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Deployments manage ReplicaSets for rolling updates.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: api
spec:
  replicas: 3
  selector:
    matchLabels:
      app: api

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ClusterIP for internal traffic; NodePort and LoadBalancer expose externally.

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Restrict pod-to-pod traffic with label selectors.

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PVs and PVCs decouple storage from pod lifecycle.

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Externalize config; never commit secrets to Git.

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Ordered deploy and stable network IDs for databases.

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HPA scales replicas based on CPU or custom metrics.

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Use metrics-server; export to Prometheus and Grafana.

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Centralize with Fluent Bit or Loki; correlate by pod labels.

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