Summary of Docker Data Storage

Before reading this article, I hope you have a basic understanding of Volumes, Bind mounts and tmpfs mounts. For details, please refer to the following articles:

• Docker Data Storage Volumes
• Docker data storage Bind mounts
• Docker data storage tmpfs mounts

The following figure shows the differences between Volumes, Bind mounts and tmpfs mounts:

Volumes usage scenarios

• Share data between multiple containers.
• There is no way to ensure that the Docker host has a specific folder or directory structure. Using Volumes can mask these host differences.
• When you want to store your data on a remote host or cloud provider.
• When you want to back up, restore, or migrate data from one Docker host to another, Volumes are a better choice.

Use cases for bind mounts

• Share configuration files between the host and the container. For example, if you save the configuration file of the nginx container on the host machine and mount it through Bind mounts, you do not need to enter the container to modify the nginx configuration.
• Share code or build output between the host and the container. For example, you can mount the target directory of a project on the host into the container. In this way, when Maven builds a new product on the host, it can be run directly in the container without generating a new image.
• The file or directory structure on the Docker host is determined

Use cases for tmpfs mounts

• When you do not want to persist data in the container or host for security or other reasons, you can use the tmpfs mounts mode.

Differences in behavior between bind mounts and volumes

• If you mount an empty volume to a non-empty container directory, the files in the container directory will be copied to the volume, that is, the original files in the container directory will not be overwritten by the volume.
• If you use Bind mounts to mount a host directory to a container directory, the original files in the container directory will be hidden, so that only the files in the host directory can be read.

References

https://docs.docker.com/storage/#good-use-cases-for-tmpfs-mounts

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