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chore(nix): Increase maximum number of layers to 96

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This uses a significantly larger percentage of the total available
layers (125) than before, which means that cache hits for layers
become more likely between images.
This commit is contained in:
Vincent Ambo 2019-08-08 20:57:11 +01:00 • committed by Vincent Ambo
parent 993fda3377
commit c727b3ca9e
2 changed files with 5 additions and 6 deletions
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9
tools/nixery/build-registry-image.nix
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@ -29,11 +29,10 @@
packages ? "[]",
# Optional bash script to run on the files prior to fixturizing the layer.
extraCommands ? "", uid ? 0, gid ? 0,
# Docker's lowest maximum layer limit is 42-layers for an old
# version of the AUFS graph driver. We pick 24 to ensure there is
# plenty of room for extension. I believe the actual maximum is
# 128.
maxLayers ? 24,
# Docker's modern image storage mechanisms have a maximum of 125
# layers. To allow for some extensibility (via additional layers),
# the default here is set to something a little less than that.
maxLayers ? 96,
# Configuration for which package set to use when building.
#