The list of path(s) to the lowerdir(s).To create a writable overlay, you MUST provide an <code>upperdir</code> and a <code>workdir</code>.You can create a read-only overlay when you provide multiple (at least 2!) lowerdirs and neither an <code>upperdir</code> nor a <code>workdir</code>.

virtualisation.fileSystems.<name>.overlay.lowerdir

The list of path(s) to the lowerdir(s).To create a writable overlay, you MUST provide an upperdir …

null or (non-empty (list of (string or path in the Nix store)))

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