Docker is a popular containerization tool used to provide software applications with a filesystem that contains everything they need to run. Using Docker containers ensures that the software will behave the same way regardless of where it is deployed because its run-time environment is consistent.

In general, Docker containers are ephemeral, running just as long as it takes for the command issued in the container to complete. Sometimes, however, applications need to share access to data or persist data after a container is deleted. Databases, user-generated content for a web site, and log files are just a few examples of data that is impractical or impossible to include in a Docker image but which applications need to access. Persistent access to data is provided with Docker Volumes.

Docker Volumes can be created and attached in the same command that creates a container, or they can be created independently of any containers and attached later. In this article, we’ll look at four different ways to share data between containers.

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