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This page purpose is to discuss on how to create a Docker image of SME Server 9 from scratch.

if you want to know more on how to run Docker on SME, this is not the good page, you should visit :

'''There is a separate page that addresses the design of a Docker contrib [http://wiki.contribs.org/Docker_design_concept here]''' 

'''There is also a page to discuss on how to us a Docker on SME [https://wiki.contribs.org/Docker]'''

==Sources==


* general information about building a regular imnage : https://docs.docker.com/engine/getstarted/step_four/

* build a full base image, example debian : https://docs.docker.com/engine/userguide/eng-image/baseimages/

* most promising , make image for Centos: https://github.com/docker/docker/blob/master/contrib/mkimage-yum.sh

* alternative, dockerize an image disk : https://github.com/docker/docker/blob/master/contrib/dockerize-disk.sh

* ultimately using docker internal auto build process : https://github.com/docker/docker/tree/master/contrib/builder/rpm/amd64

==Base Script==
 #!/usr/bin/env bash
 #
 # 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.
 
 usage() {
     cat <<EOOPTS
 $(basename $0) [OPTIONS] <name>
 OPTIONS:
   -p "<packages>"  The list of packages to install in the container.
                    The default is blank.
   -g "<groups>"    The groups of packages to install in the container.
                    The default is "Core".
   -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
 EOOPTS
     exit 1
 }
 
 # option defaults
 yum_config=/etc/yum.conf
 if [ -f /etc/dnf/dnf.conf ] && command -v dnf &> /dev/null; then
     yum_config=/etc/dnf/dnf.conf
     alias yum=dnf
 fi
 install_groups="Core"
 while getopts ":y:p:g:h" opt; do
     case $opt in
         y)
             yum_config=$OPTARG
             ;;
         h)
             usage
             ;;
         p)
             install_packages="$OPTARG"
             ;;
         g)
             install_groups="$OPTARG"
             ;;
         \?)
             echo "Invalid option: -$OPTARG"
             usage
             ;;
     esac
 done
 shift $((OPTIND - 1))
 name=$1
 
 if [[ -z $name ]]; then
     usage
 fi
 
 target=$(mktemp -d --tmpdir $(basename $0).XXXXXX)
 
 set -x
 
 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
 
 # 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
 
 if [[ -n "$install_groups" ]];
 then
     yum -c "$yum_config" --installroot="$target" --releasever=/ --setopt=tsflags=nodocs \
         --setopt=group_package_types=mandatory -y groupinstall $install_groups
 fi
 
 if [[ -n "$install_packages" ]];
 then
     yum -c "$yum_config" --installroot="$target" --releasever=/ --setopt=tsflags=nodocs \
         --setopt=group_package_types=mandatory -y install $install_packages
 fi
 
 yum -c "$yum_config" --installroot="$target" -y clean all
 
 cat > "$target"/etc/sysconfig/network <<EOF
 NETWORKING=yes
 HOSTNAME=localhost.localdomain
 EOF
 
 # effectively: febootstrap-minimize --keep-zoneinfo --keep-rpmdb --keep-services "$target".
 #  locales
 rm -rf "$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
 
 version=
 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
 
 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
 
 docker run -i -t --rm $name:$version /bin/bash -c 'echo success'
 
 rm -rf "$target"
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