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CentOS 8 image generator

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  1. 56
      tools/qemu-centos-img/8/Dockerfile
  2. 6
      tools/qemu-centos-img/8/generate.sh

56
tools/qemu-centos-img/8/Dockerfile

@ -0,0 +1,56 @@
# Copyright 2020 Mikhail Klementev. All rights reserved.
# Use of this source code is governed by a AGPLv3 license
# (or later) that can be found in the LICENSE file.
#
# Usage:
#
# $ sudo docker build -t gen-centos8-image .
# $ sudo docker run --privileged -v $(pwd):/shared -t gen-centos8-image
# $ tar -Szcf out_of_tree_centos_8.img.tar.gz out_of_tree_centos_8.img
#
# out_of_tree_centos_8.img will be created in current directory.
# You can change $(pwd) to different directory to use different destination
# for image.
#
FROM centos:8
RUN yum -y update
RUN yum -y groupinstall "Development Tools"
RUN yum -y install qemu-img e2fsprogs
ENV TMPDIR=/tmp/centos
RUN yum --installroot=$TMPDIR \
--releasever=8 \
--disablerepo='*' \
--enablerepo=BaseOS \
-y groupinstall Base
RUN yum --installroot=$TMPDIR \
--releasever=8 \
--disablerepo='*' \
--enablerepo=BaseOS \
-y install openssh-server openssh-clients
RUN chroot $TMPDIR /bin/sh -c 'useradd -m user'
RUN sed -i 's/root:\*:/root::/' $TMPDIR/etc/shadow
RUN sed -i 's/user:!!:/user::/' $TMPDIR/etc/shadow
RUN sed -i '/PermitEmptyPasswords/d' $TMPDIR/etc/ssh/sshd_config
RUN echo PermitEmptyPasswords yes >> $TMPDIR/etc/ssh/sshd_config
RUN sed -i '/PermitRootLogin/d' $TMPDIR/etc/ssh/sshd_config
RUN echo PermitRootLogin yes >> $TMPDIR/etc/ssh/sshd_config
# network workaround
RUN chmod +x $TMPDIR/etc/rc.local
RUN echo 'dhclient' >> $TMPDIR/etc/rc.local
ENV IMAGEDIR=/tmp/image
ENV IMAGE=/shared/out_of_tree_centos_8.img
RUN mkdir $IMAGEDIR
# Must be executed with --privileged because of /dev/loop
CMD qemu-img create $IMAGE 2G && \
mkfs.ext4 -F $IMAGE && \
mount -o loop $IMAGE $IMAGEDIR && \
cp -a $TMPDIR/* $IMAGEDIR/ && \
umount $IMAGEDIR

6
tools/qemu-centos-img/8/generate.sh

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#!/bin/sh
cd "$(dirname "$0")"
sudo docker build -t gen-centos8-image .
sudo docker run --privileged -v $(pwd):/shared -t gen-centos8-image
tar -Szcf out_of_tree_centos_8.img.tar.gz out_of_tree_centos_8.img
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