Summary

We covered the following topics in this chapter:

• Docker volumes can be used to share folders or files from the host with the container(s).
• Containers can share volumes using named volumes or -volumes-from flag.
• Applications using shared volumes should make ensure that multiple containers do not write to a shared file at once or else the data might end up corrupted.
• Relational databases can also be run and configured as containers.
• Volumes attached to a container in running state cannot be deleted. The container should be stopped first to delete the volume.
• Multiple volumes can be attached to one container.
• VOLUME is a Dockerfile instruction which can be used to create volumes as part of the build process.
• Microsoft provides a container image for SQL Server Express 2016 and 2014 which can be readily used.
• We can use Azure storage for Azure container hosts or storage spaces for on-premises container hosts while using database containers to configure scalable storages.