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dockerdocker-for-windowsdocker-desktop

Docker Desktop cannot set large disk size

I'm running Docker Desktop 2.2.0 on Windows 10. It appears that the disk size cannot be set beyond 64GB. I tried setting the diskSizeMiB value to 100GB in %APPDATA%\Docker\settings.json, but docker appears to ignore it and set the size to 64GB in the resulting Hyper-V VM.

    "cpus": 6,
    "diskSizeMiB": 102400,

The issue I'm having is older images being evicted when pulling new ones in. Even when manually expanding the HyperV disk to 100GB, docker pull deletes older images to make space for new ones.

Docker for Windows docs don't seem to explicitly mention a limit, but 64Gb ominously equals 2^16 bytes which hints at it being a technical limit.

Anyone knows of a workaround for this limitation?

Solution

  • Looks like I was on the right track with increasing the virtual disk size directly in Hyper-V (See this guide). The only missing piece was restarting Docker (or Windows). Once restarted, I was able to use the full disk.