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Config apt inside docker images to save disk space: auto clean, gz, no trans (#69)

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Qi Luo
2016-11-16 12:46:15 -08:00
committed by Shuotian Cheng
parent 0f0f9926c7
commit af38c0e77d
5 changed files with 230 additions and 1 deletions
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194
ThirdPartyLicenses.txt
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@@ -976,3 +976,197 @@ Microsoft is offering you a license to use the following components, to the exte
* Public License instead of this License. But first, please read
* <http://www.gnu.org/philosophy/why-not-lgpl.html>.
*/
4. apt-clean, apt-gzip-indexes, apt-no-languages imported from docker v1.11.1
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2
build_debian.sh
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@@ -91,7 +91,7 @@ sudo LANG=C chroot $FILESYSTEM_ROOT mount sysfs /sys -t sysfs
## Pointing apt to public apt mirrors and getting latest packages, needed for latest security updates
sudo cp files/apt/sources.list $FILESYSTEM_ROOT/etc/apt/
sudo cp files/apt/apt.conf.d/81norecommends $FILESYSTEM_ROOT/etc/apt/apt.conf.d/
sudo cp files/apt/apt.conf.d/{81norecommends,apt-{clean,gzip-indexes,no-languages}} $FILESYSTEM_ROOT/etc/apt/apt.conf.d/
sudo LANG=C chroot $FILESYSTEM_ROOT bash -c 'apt-mark auto `apt-mark showmanual`'
## Note: set lang to prevent locale warnings in your chroot

19
files/apt/apt.conf.d/apt-clean Normal file
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@@ -0,0 +1,19 @@
# Since for most Docker users, package installs happen in "docker build" steps,
# they essentially become individual layers due to the way Docker handles
# layering, especially using CoW filesystems. What this means for us is that
# the caches that APT keeps end up just wasting space in those layers, making
# our layers unnecessarily large (especially since we'll normally never use
# these caches again and will instead just "docker build" again and make a brand
# new image).
# Ideally, these would just be invoking "apt-get clean", but in our testing,
# that ended up being cyclic and we got stuck on APT's lock, so we get this fun
# creation that's essentially just "apt-get clean".
DPkg::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };
APT::Update::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };
Dir::Cache::pkgcache "";
Dir::Cache::srcpkgcache "";
# Note that we do realize this isn't the ideal way to do this, and are always
# open to better suggestions (https://github.com/docker/docker/issues).

11
files/apt/apt.conf.d/apt-gzip-indexes Normal file
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@@ -0,0 +1,11 @@
# Since Docker users using "RUN apt-get update && apt-get install -y ..." in
# their Dockerfiles don't go delete the lists files afterwards, we want them to
# be as small as possible on-disk, so we explicitly request "gz" versions and
# tell Apt to keep them gzipped on-disk.
# For comparison, an "apt-get update" layer without this on a pristine
# "debian:wheezy" base image was "29.88 MB", where with this it was only
# "8.273 MB".
Acquire::GzipIndexes "true";
Acquire::CompressionTypes::Order:: "gz";

5
files/apt/apt.conf.d/apt-no-languages Normal file
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@@ -0,0 +1,5 @@
# In Docker, we don't often need the "Translations" files, so we're just wasting
# time and space by downloading them, and this inhibits that. For users that do
# need them, it's a simple matter to delete this file and "apt-get update". :)
Acquire::Languages "none";