Docker is a popular choice in tech today. However, containers alone are not enough to bring complex applications into production. Load balancing, fault tolerance, continuous integration and delivery, logging/monitoring, and release management are some of the other important aspects for successfully rolling out software products.
Kubernetes helps achieve these tasks by transferring the area of containers to the cloud. It makes it possible to model a single large host from many “small” hosts, which then benefits from automation. However, Kubernetes is just a piece of technology meant to simplify the release and development process.
Finally, OpenShift from Red Hat is a well-rounded approach towards DevOps that brings everything together.