Docker vs Kubernetes

Docker Engine is a container engine and CLI: it builds images and runs containers on a host. Kubernetes is a control plane for scheduling and managing workloads across a cluster. Kubernetes can use container runtimes that implement its supported interface; it is not simply a bigger docker run command.

Use Docker or Compose for local development, a single host, and simple test environments. Kubernetes becomes useful when you need cluster scheduling, service discovery, rolling deployments, declarative reconciliation, and a team prepared to operate that complexity. It adds its own networking, storage, security, and observability concerns.

The tools can coexist: build an image with Docker or another builder, publish it to a registry, and reference it from a Kubernetes workload. Avoid old advice that assumes Kubernetes includes the Docker Engine or that every application needs a cluster. Start with the least complex platform that meets availability, scaling, and operational requirements.

Sources

• Docker documentation

• Kubernetes overview