Microservices, as we know, are self-contained, individual units that perform only one business function, so much so that each unit can be considered an application on its own. The application development environment and application deployment environment are bound to vary in many aspects. This gives rise to deployment issues. Docker provides a static background for the application to run, thus avoiding deployment issues. It is, in fact, a containerization tool. It reduces overhead and deploys thousands of microservices on the same server. Docker ensures that an application microservices will run on their own environments and are entirely separate from their operating system.