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#!/usr/bin/env bash |
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#
# Create a base CentOS Docker image.
#
# This script is useful on systems with yum installed (e.g., building
# a CentOS image on CentOS). See contrib/mkimage-rinse.sh for a way
# to build CentOS images on other systems.
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set -e
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usage() {
cat <<EOOPTS
$(basename $0) [OPTIONS] <name>
OPTIONS: |
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-p "<packages>" The list of packages to install in the container. |
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The default is blank. Can use multiple times. |
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-g "<groups>" The groups of packages to install in the container. |
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The default is "Core". Can use multiple times. |
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-y <yumconf> The path to the yum config to install packages from. The
default is /etc/yum.conf for Centos/RHEL and /etc/dnf/dnf.conf for Fedora |
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-t <tag> Specify Tag information.
default is reffered at /etc/{redhat,system}-release |
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EOOPTS
exit 1
}
# option defaults
yum_config=/etc/yum.conf |
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if [ -f /etc/dnf/dnf.conf ] && command -v dnf &> /dev/null; then
yum_config=/etc/dnf/dnf.conf
alias yum=dnf |
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fi |
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# for names with spaces, use double quotes (") as install_groups=('Core' '"Compute Node"') |
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install_groups=()
install_packages=() |
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version=
while getopts ":y:p:g:t:h" opt; do |
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case $opt in
y)
yum_config=$OPTARG
;;
h)
usage
;; |
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p) |
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install_packages+=("\"$OPTARG\"") |
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;;
g) |
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install_groups+=("\"$OPTARG\"") |
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;; |
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t)
version="$OPTARG"
;; |
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\?)
echo "Invalid option: -$OPTARG"
usage
;;
esac
done
shift $((OPTIND - 1))
name=$1
if [[ -z $name ]]; then
usage
fi
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# default to Core group if not specified otherwise
if [ ${#install_groups[*]} -eq 0 ]; then
install_groups=('Core')
fi
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target=$(mktemp -d --tmpdir $(basename $0).XXXXXX)
set -x
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mkdir -m 755 "$target"/dev |
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mknod -m 600 "$target"/dev/console c 5 1
mknod -m 600 "$target"/dev/initctl p
mknod -m 666 "$target"/dev/full c 1 7
mknod -m 666 "$target"/dev/null c 1 3
mknod -m 666 "$target"/dev/ptmx c 5 2
mknod -m 666 "$target"/dev/random c 1 8
mknod -m 666 "$target"/dev/tty c 5 0
mknod -m 666 "$target"/dev/tty0 c 4 0
mknod -m 666 "$target"/dev/urandom c 1 9
mknod -m 666 "$target"/dev/zero c 1 5 |
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|
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# amazon linux yum will fail without vars set
if [ -d /etc/yum/vars ]; then
mkdir -p -m 755 "$target"/etc/yum
cp -a /etc/yum/vars "$target"/etc/yum/
fi
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if [[ -n "$install_groups" ]];
then
yum -c "$yum_config" --installroot="$target" --releasever=/ --setopt=tsflags=nodocs \ |
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--setopt=group_package_types=mandatory -y groupinstall "${install_groups[*]}" |
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fi
if [[ -n "$install_packages" ]];
then
yum -c "$yum_config" --installroot="$target" --releasever=/ --setopt=tsflags=nodocs \ |
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--setopt=group_package_types=mandatory -y install "${install_packages[*]}" |
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fi
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yum -c "$yum_config" --installroot="$target" -y clean all |
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cat > "$target"/etc/sysconfig/network <<EOF
NETWORKING=yes
HOSTNAME=localhost.localdomain
EOF
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# effectively: febootstrap-minimize --keep-zoneinfo --keep-rpmdb --keep-services "$target". |
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# locales
rm -rf "$target"/usr/{{lib,share}/locale,{lib,lib64}/gconv,bin/localedef,sbin/build-locale-archive} |
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# docs and man pages |
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rm -rf "$target"/usr/share/{man,doc,info,gnome/help}
# cracklib
rm -rf "$target"/usr/share/cracklib
# i18n
rm -rf "$target"/usr/share/i18n |
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# yum cache
rm -rf "$target"/var/cache/yum
mkdir -p --mode=0755 "$target"/var/cache/yum |
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# sln
rm -rf "$target"/sbin/sln
# ldconfig |
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rm -rf "$target"/etc/ld.so.cache "$target"/var/cache/ldconfig
mkdir -p --mode=0755 "$target"/var/cache/ldconfig |
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|
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if [ -z "$version" ]; then
for file in "$target"/etc/{redhat,system}-release
do
if [ -r "$file" ]; then
version="$(sed 's/^[^0-9\]*\([0-9.]\+\).*$/\1/' "$file")"
break
fi
done
fi |
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if [ -z "$version" ]; then
echo >&2 "warning: cannot autodetect OS version, using '$name' as tag"
version=$name
fi
tar --numeric-owner -c -C "$target" . | docker import - $name:$version |
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|
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docker run -i -t --rm $name:$version /bin/bash -c 'echo success' |
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rm -rf "$target" |