Does the feature of Garbage Collection exist in Docker

Question

I've been working quite a bit with Docker these last few weeks and one thing that I found really annoying was all these unused containers and images taking up precious disk space.

I wish Docker has a command that would perhaps work like a garbage collector and remove all the unused resources( images, containers,volumes,network and other such dangling resources) Is there any way I could achieve this objective?

Answer 1

Yes you can clean up resources in docker all at once.Docker takes a conservative approach to cleaning up unused objects (often referred to as “garbage collection”), such as images, containers, volumes, and networks: these objects are generally not removed unless you explicitly ask Docker to do so. This can cause Docker to use extra disk space. For each type of object, Docker provides a prune command. In addition, you can use docker system prune to clean up multiple types of objects at once. 

The docker system prune command is a shortcut that prunes images, containers, and networks. In Docker 17.06.0 and earlier, volumes are also pruned. In Docker 17.06.1 and higher, you must specify the --volumes flag for docker system prune to prune volumes.

The command is :

docker system prune [OPTIONS]

--all , -a		Remove all unused images not just dangling ones
--filter		API 1.28+ Provide filter values (e.g. ‘label==')
--force , -f		Do not prompt for confirmation
--volumes		Prune volumes

Here's  an example: