Docker Containers Move Deeper Into Production

By the end of 2014, Docker had moved beyond developer experimentation and was increasingly being tested for production deployments. The attraction was consistency: the same container image could move from a developer’s laptop into testing and then into a server environment.

Docker images used layers, so related images could share common filesystem content instead of duplicating everything. Registries provided a distribution mechanism, while Linux namespaces and cgroups provided isolation and resource control.

Production use also exposed what Docker did not solve. Teams still needed service discovery, networking, scheduling, health checks, secrets, logging, and ways to replace failed containers. Those missing pieces created the opening for orchestration platforms such as Kubernetes, Mesos, and Docker’s own Swarm.