Docker commands to clean unused images

If you use docker for some time, there will be a lot of trash images, volumes that is not used by any containers. Here’s how to remove them. (warning: not reversible)

Remove dangling images

Remove dangling volumes

As seen from above commands, you may guess the nested command within the $(…) is used to list dangling images/volumes

List dangling images

List dangling volumes

Docker named volume explained

Named volume is a new feature since Docker 1.9, it allows you to manage persistent data more easily, and also the volume can be provided by other storage drivers such as Glusterfs instead of “just a directory on the host”. This new feature is particularly useful in production environment. (On the Dev side, I think we still need mounted volume) Continue reading