CentOS7创建Docker基础镜像

从已安装的系统创建

tar -zcvf /tmp/CentOS-7.4-BaseImage.tar.gz / --numeric-owner --exclude=proc --exclude=sys --exclude=mnt --exclude=tmp

cat CentOS-7.4-BaseImage.tar.gz | docker import - centos:7.4

以虚拟根目录全新安装


#!/usr/bin/env bash
#
# Create a base CentOS Docker image.
#

yum_config=/etc/yum.conf

install_groups="Core"

target=$(mktemp -d --tmpdir $(basename $0).XXXXXX)

mkdir -m 755 "$target"/dev
mknod -m 600 "$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

yum -c "$yum_config" --installroot="$target" --releasever=/ --setopt=tsflags=nodocs --setopt=group_package_types=mandatory -y groupinstall "Core"
yum -c "$yum_config" --installroot="$target" -y clean all

cat > "$target"/etc/sysconfig/network <<EOF
NETWORKING=yes
HOSTNAME=localhost.localdomain
EOF

# locales
rm -rf "$target"/usr/{{lib,share}/locale,{lib,lib64}/gconv,bin/localedef,sbin/build-locale-archive}
# docs and man pages
rm -rf "$target"/usr/share/{man,doc,info,gnome/help}
# cracklib
rm -rf "$target"/usr/share/cracklib
# i18n
rm -rf "$target"/usr/share/i18n
# yum cache
rm -rf "$target"/var/cache/yum
mkdir -p --mode=0755 "$target"/var/cache/yum
# sln
rm -rf "$target"/sbin/sln
# ldconfig
rm -rf "$target"/etc/ld.so.cache "$target"/var/cache/ldconfig
mkdir -p --mode=0755 "$target"/var/cache/ldconfig

cd $target

tar -zcf tmp/Centos7-docker.tar.gz --numeric-owner --exclude=proc --exclude=sys --exclude=mnt --exclude=tmp --exclude=run *