Kubernetes vs Docker: 7 Key Differences

Docker and Kubernetes are complementary container technologies rather than competing alternatives: Docker primarily packages applications into lightweight, portable container images, while Kubernetes orchestrates those containers across clusters of machines. Docker is generally suited to building and running individual containers or simpler deployments, with tools such as Docker Swarm offering limited orchestration, whereas Kubernetes provides advanced capabilities for large-scale deployments, including scheduling, self-healing, load balancing, service discovery, autoscaling, networking policies, and persistent storage. Kubernetes became the dominant container orchestrator after its 2014 release, surpassing alternatives such as Docker Swarm for complex production environments, although simpler cloud services may suit smaller organizations. Kubernetes no longer uses Docker directly as its runtime, instead relying on OCI-compliant runtimes such as containerd, but Docker-built images remain commonly used in Kubernetes workflows.

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