Reclaiming Gigabytes From Docker With One Command

In my previous blogpost I installed Portainer in Docker Compose. It’s a great graphical user interface for managing Docker containers and images. While exploring Portainer I noticed something strange: I had a lot of unused images! What happened? This is my story of how I reclaimed almost 200GB of data, just from deleting unused Docker images. What are Unused Docker Images? There are a few scenario’s when a Docker image can be unused.
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