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kappa 370c7da4a9 dev: NixOS 25.11 매뉴얼 로컬 사본 추가

nixpkgs nixos-25.11 브랜치의 nixos/doc/manual/ 디렉토리를 sparse clone으로
가져와 ~/obsidian/dev/nixos-manual/에 복사. _index.md에 구조/갱신 방법 정리.

오프라인 참조 + AI 에이전트 컨텍스트용. sandbox-tokyo 같은 NixOS 노드 운영 시
빠른 참조로 사용.

2026-04-08 16:15:46 +09:00

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Overlayfs

NixOS offers a convenient abstraction to create both read-only as well writable overlays.

{
  fileSystems = {
    "/writable-overlay" = {
      overlay = {
        lowerdir = [ writableOverlayLowerdir ];
        upperdir = "/.rw-writable-overlay/upper";
        workdir = "/.rw-writable-overlay/work";
      };
      # Mount the writable overlay in the initrd.
      neededForBoot = true;
    };
    "/readonly-overlay".overlay.lowerdir = [
      writableOverlayLowerdir
      writableOverlayLowerdir2
    ];
  };
}

If upperdir and workdir are not null, they will be created before the overlay is mounted.

To mount an overlay as read-only, you need to provide at least two lowerdirs.

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Overlayfs

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