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How to reduce size of docker data volume in Docker Desktop for Windows v2
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how-to-reduce-size-of-docker-data-volume-in-docker-desktop-for-windows-v2.md

How to reduce size of docker data volume in Docker Desktop for Windows v2

Docker Desktop for Windows v2, which uses WSL2, stores all image and container files in a separate virtual volume (vhdx). This virtual hard disk file can automatically grow when it needs more space (to a certain limit). Unfortunately, if you reclaim some space, i.e. by removing unused images, vhdx doesn't shrink automatically.

Optimize

wsl --shutdown
Optimize-VHD -Path "$($env:LOCALAPPDATA)\Docker\wsl\data\ext4.vhdx" -Mode Full

Resize

Set-Variable -Name "MaxSizeGB" -Value "32GB"
wsl --shutdown
resize-vhd -Path "$($env:LOCALAPPDATA)\Docker\wsl\data\ext4.vhdx" -SizeBytes $MaxSize
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