First introduced in 2013, Docker is one of those tools that, not unlike the version control software Git, has become nearly ubiquitous in software development. As a lightweight virtualization software, it elegantly solvescommon problems in software engineering related to developing and deploying applications. Dockercreates independent operating environments, so-called ‘containers’, with which one can deploy applications in a flexible and reproducible manner. A singleDocker command on the command line can launch an entire application, either locally or on a server, with any number and kind of desired frontends, backends, services, databases, etc. This containerized approach to application development has many advantages for software engineering in general, and for the the Digital Humanities specifically, including: