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Reduce maxLayers to 70 in docker build

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The nixos/nix docker image is built using `buildLayeredImage`, which spreads the nix store over a configured number of layers. This number was set to create an image with 100 layers. Because there is a limit of (typically) 127 layers in AUFS, this only left 27 layers to build on top. At the same time, nearly half of the created layers were only <100kb in size, many even <10kb, negating the intended advantage in cachability.

This commit moves the tradeoff a bit by reducing the number of layers to 70.

Layer sizes for the 2.28.3 nixos/nix image: https://hub.docker.com/layers/nixos/nix/2.28.3/images/sha256-d078d7153763895fce17c5fbbdeb86fcfcac414ca0ba875d413c1df57be19931
This commit is contained in:
Vincent Breitmoser 2025-05-08 09:56:14 +02:00 • committed by GitHub
parent 1e822bd414
commit 6d0f174cd9
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docker.nix
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@ -7,7 +7,7 @@
channelName ? "nixpkgs",
channelURL ? "https://nixos.org/channels/nixpkgs-unstable",
extraPkgs ? [ ],
maxLayers ? 100,
maxLayers ? 70,
nixConf ? { },
flake-registry ? null,
uid ? 0,