GitHub PullRequestEvent at 2014-12-21 03:22:09
Repository: docker
Actor: ztombol
Payload: {"action":"opened","number":9764,"pull_request":{"url":"https://api.github.com/repos/docker/docker/pulls/9764","id":26423829,"html_url":"https://github.com/docker/docker/pull/9764","diff_url":"https://github.com/docker/docker/pull/9764.diff","patch_url":"https://github.com/docker/docker/pull/9764.patch","issue_url":"https://api.github.com/repos/docker/docker/issues/9764","number":9764,"state":"open","locked":false,"title":"Fix reduce arch rootfs size","user":{"login":"ztombol","id":5340257,"avatar_url":"https://avatars.githubusercontent.com/u/5340257?v=3","gravatar_id":"","url":"https://api.github.com/users/ztombol","html_url":"https://github.com/ztombol","followers_url":"https://api.github.com/users/ztombol/followers","following_url":"https://api.github.com/users/ztombol/following{/other_user}","gists_url":"https://api.github.com/users/ztombol/gists{/gist_id}","starred_url":"https://api.github.com/users/ztombol/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ztombol/subscriptions","organizations_url":"https://api.github.com/users/ztombol/orgs","repos_url":"https://api.github.com/users/ztombol/repos","events_url":"https://api.github.com/users/ztombol/events{/privacy}","received_events_url":"https://api.github.com/users/ztombol/received_events","type":"User","site_admin":false},"body":"# Overview\r\n\r\nThis pull request aims to clean up and slightly reduce the size of Arch Linux base images generated with `mkimage-arch.sh`. So far it does the following two things:\r\n\r\n- prevent installing more unnecessary packages\r\n- delete man pages of installed packages\r\n\r\nThese changes reduce the image size by 16.1 MB or ~5% (from 309.7 MB to 293.6 MB).\r\n\r\n***Note:*** *Image size is the VIRTUAL SIZE as reported by `docker inspect` on a btrfs file system. The test images were built around 2014-12-21 00:49:28 UTC.*\r\n\r\n# Details\r\n\r\n## Deleting man pages\r\n\r\nThe script already skips installing [`man-db`][pkg-man-db] and [`man-pages`][pkg-man-pages] to save on disk space, however it fails to delete man pages that belong to the installed packages. `rm -r /usr/share/man/*` accomplishes just that, and reduces the image size by about 11.9 MB.\r\n\r\n\r\n## Revising list of installed packages\r\n\r\nThis is more for cleaning up than to save a few megabytes, but it also further reduces the image size by 4.2 MB.\r\n\r\nThe following is a revised list of packages that should not be installed and a short explanation on why they should be left out, along with a few notes on packages that cannot be left out. Packages denoted with an _*_ are already ignored in the current version of `mkimage-arch.sh`, the rest are new additions.\r\n\r\n- [`linux*`][pkg-linux], [`systemd-sysvcompat`][pkg-systemd-sysvcompat] - Containers do not boot.\r\n\r\n  > [`systemd`][pkg-systemd] - [`procps-ng`][pkg-procps-ng] (`pkill`, `pgrep`, etc.) depends on it.\r\n- [`openresolv`][pkg-openresolv] - `resolv.conf` is managed by the docker daemon.\r\n- [`netctl`][pkg-netctl],[`dhcpcd`][pkg-dhcpcd],[`iproute2`][pkg-iproute2] - Network interface is managed by the docker daemon.\r\n\r\n  > [`inetutils`][pkg-inetutils] - Contains `telnet` and `ftp`.\r\n  > [`iputils`][pkg-iputils] - Contains `ping`.\r\n- [`pciutils*`][pkg-pciutils], [`pcmciautils*`][pkg-pcmciautils], [`usbutils`][pkg-usbutils] - Hardware management is done by the host.\r\n- [`jfsutils*`][pkg-jfsutils], [`xfsprogs*`][pkg-xfsprogs], [`reiserfsprogs*`][pkg-reiserfsprogs] - File systems are managed by the host.\r\n\r\n  > [`e2fsprogs`][pkg-e2fspriogs] - [`pam`][pkg-pam], a `base` package indirectly depends on it.\r\n- [`lvm2*`][pkg-lvm2], [`mdadm`][pkg-mdadm*], [`cryptsetup*`][pkg-cryptsetup], [`device-mapper`][pkg-device-mapper] - Storage devices are managed by the host.\r\n- [`man-db*`][pkg-man-db], [`man-pages*`][pkg-man-pages] - Documentation not useful inside a container.\r\n\r\n  > [`texinfo`][pkg-texinfo] - `pacman` indirectly depends on it.\r\n  > [`licenses`][pkg-licenses] - Should not be left out, see [here][https://wiki.archlinux.org/index.php/PKGBUILD#license]\r\n- [`s-nail*`][pkg-s-nail] - Unlikely to be widely used.\r\n\r\nFor completeness, here are the members of the `base` group that are installed.\r\n[`bash`][pkg-bash], [`bzip2`][pkg-bzip2], [`coreutils`][pkg-coreutils], [`diffutils`][pkg-diffutils], [`file`][pkg-file], [`filesystem`][pkg-filesystem], [`findutils`][pkg-findutils], [`gawk`][pkg-gawk], [`gcc-libs`][pkg-gcc-libs], [`gettext`][pkg-gettext], [`glibc`][pkg-glibc], [`grep`][pkg-grep], [`gzip`][pkg-gzip], [`inetutils`][pkg-inetutils], [`iproute2`][pkg-iproute2], [`iputils`][pkg-iputils], [`less`][pkg-less], [`licenses`][pkg-licenses], [`logrotate`][pkg-logrotate], [`nano`][pkg-nano], [`pacman`][pkg-pacman], [`perl`][pkg-perl], [`procps-ng`][pkg-procps-ng], [`psmisc`][pkg-psmisc], [`sed`][pkg-sed], [`shadow`][pkg-shadow], [`sysfsutils`][pkg-sysfsutils], [`tar`][pkg-tar], [`util-linux`][pkg-util-linux], [`vi`][pkg-vi], [`which`][pkg-which].\r\n\r\n***Note:*** *`groff` has been removed from the ignore list because it is actually not installed by `base` (it's in `base-devel`).*\r\n\r\n\r\n# Feedback wanted\r\n\r\nThe patched script builds a working image, however it's possible that I overlooked an unnecessary package or removed an important one. I linked all package names to the respective pages on the Arch Linux web site to make it easier to review the changes. Let me know what you think.\r\n\r\n\r\n\r\n<!-- References -->\r\n\r\n<!-- IGNORED -->\r\n[pkg-linux]: https://www.archlinux.org/packages/core/x86_64/linux/\r\n[pkg-systemd-sysvcompat]: https://www.archlinux.org/packages/core/x86_64/systemd-sysvcompat/\r\n[pkg-systemd]: https://www.archlinux.org/packages/core/x86_64/systemd/\r\n[pkg-procps-ng]: https://www.archlinux.org/packages/core/x86_64/procps-ng/\r\n[pkg-openresolv]: https://www.archlinux.org/packages/core/x86_64/openresolv/\r\n[pkg-netctl]: https://www.archlinux.org/packages/core/x86_64/netctl/\r\n[pkg-dhcpcd]: https://www.archlinux.org/packages/core/x86_64/dhcpcd/\r\n[pkg-iproute2]: https://www.archlinux.org/packages/core/x86_64/iproute2/\r\n[pkg-inetutils]: https://www.archlinux.org/packages/core/x86_64/inetutils/\r\n[pkg-iputils]: https://www.archlinux.org/packages/core/x86_64/iputils/\r\n[pkg-pciutils]: https://www.archlinux.org/packages/core/x86_64/pciutils/\r\n[pkg-pcmciautils]: https://www.archlinux.org/packages/core/x86_64/pcmciautils/\r\n[pkg-usbutils]: https://www.archlinux.org/packages/core/x86_64/usbutils/\r\n[pkg-jfsutils]: https://www.archlinux.org/packages/core/x86_64/jfsutils/\r\n[pkg-xfsprogs]: https://www.archlinux.org/packages/core/x86_64/xfsprogs/\r\n[pkg-reiserfsprogs]: https://www.archlinux.org/packages/core/x86_64/reiserfsprogs/\r\n[pkg-e2fspriogs]: https://www.archlinux.org/packages/core/x86_64/e2fspriogs/\r\n[pkg-pam]: https://www.archlinux.org/packages/core/x86_64/pam/\r\n[pkg-lvm2]: https://www.archlinux.org/packages/core/x86_64/lvm2/\r\n[pkg-mdadm]: https://www.archlinux.org/packages/core/x86_64/mdadm/\r\n[pkg-cryptsetup]: https://www.archlinux.org/packages/core/x86_64/cryptsetup/\r\n[pkg-device-mapper]: https://www.archlinux.org/packages/core/x86_64/device-mapper/\r\n[pkg-man-db]: https://www.archlinux.org/packages/core/x86_64/man-db/\r\n[pkg-man-pages]: https://www.archlinux.org/packages/core/x86_64/man-pages/\r\n[pkg-texinfo]: https://www.archlinux.org/packages/core/x86_64/texinfo/\r\n[pkg-ca-certificates]: https://www.archlinux.org/packages/core/x86_64/ca-certificates/\r\n[pkg-curl]: https://www.archlinux.org/packages/core/x86_64/curl/\r\n[pkg-pacman]: https://www.archlinux.org/packages/core/x86_64/pacman/\r\n[pkg-gnutls]: https://www.archlinux.org/packages/core/x86_64/gnutls/\r\n[pkg-licenses]: https://www.archlinux.org/packages/core/x86_64/licenses/\r\n[pkg-s-nail]: https://www.archlinux.org/packages/core/x86_64/s-nail/\r\n\r\n<!-- INSTALLED -->\r\n[pkg-bash]: https://www.archlinux.org/packages/core/x86_64/bash/\r\n[pkg-bzip2]: https://www.archlinux.org/packages/core/x86_64/bzip2/\r\n[pkg-coreutils]: https://www.archlinux.org/packages/core/x86_64/coreutils/\r\n[pkg-diffutils]: https://www.archlinux.org/packages/core/x86_64/diffutils/\r\n[pkg-file]: https://www.archlinux.org/packages/core/x86_64/file/\r\n[pkg-filesystem]: https://www.archlinux.org/packages/core/x86_64/filesystem/\r\n[pkg-findutils]: 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