Chapter 01110 mins • advanced
Bridge to Kubernetes (K8s)
From Single Host Containers to Distributed Cluster Orchestration
What You Will Master:
- Understand why orchestration is needed beyond single-host Docker
- Map Docker concepts to Kubernetes equivalents (Pod, Deployment, Service, ConfigMap)
- Prepare for multi-node production deployment
1Docker to Kubernetes Conceptual Rosetta Stone
| Docker Concept | Kubernetes Equivalent | Purpose in Kubernetes |
| :--- | :--- | :--- |
| **Container** | **Pod (1+ containers)** | Smallest deployable unit sharing network namespace |
| **docker run / restart** | **Deployment & ReplicaSet** | Self-healing, declarative desired state & rolling updates |
| **Port Mapping (`-p`)** | **Service (ClusterIP/NodePort)** | Stable internal load balancer & DNS abstraction |
| **Custom Network** | **Cluster CNI (Calico/Flannel)** | Flat cross-node pod networking |
| **Named Volume** | **PersistentVolumeClaim (PVC)** | Storage provisioner decoupled from cluster nodes |
| **-e ENV=val** | **ConfigMap & Secret** | Externalized configuration & encrypted secrets |
| **Docker Compose** | **Helm Chart / K8s Manifests** | Multi-tier distributed application definition |
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