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How to Remove Orphaned Volumes in Docker

howchoo   (467)
August 22, 2023
3 minutes


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docker • 4 guides

When using Docker sometimes it’s necessary to do some cleanup in order to free up space. I ran into an issue recently where I could not start my database container. The error message was:

db_1     | creating subdirectories ... initdb: could not create directory "/var/lib/postgresql/data/global": No space left on device

One simple way to free up space is to delete dangling or orphaned volumes. A dangling volume is a volume that is not referenced by any container.

1 – docker volume rm $(docker volume ls -qf dangling=true)

Let’s break this down.

First, if you want to see a list of the dangling volumes you can simply run:

docker volume ls -qf dangling=true

docker volume ls lists the volumes and -qf means list only the ids and filter on dangling=true.

To delete these volumes we’ll pass them in to the docker volume rm function which takes a volume id or list of ids. The final command is:

docker volume rm $(docker volume ls -qf dangling=true)

How to Run a Raspberry Pi Cluster with Docker Swarm

An in-depth Raspberry Pi cluster example.
howchoo   (467)
September 20, 2023

A cluster is a group of computers performing the same task, operating as a single system. Although Raspberry Pi’s are pretty incredible devices, a single Pi can only do so much. A Raspberry Pi cluster can be used anytime you want to improve performance or availability, and there are many use cases including serving web

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