Initial CentOS image build script
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centos-build-opennebula-image.sh
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centos-build-opennebula-image.sh
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#!/bin/sh
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# This script generates CentOS images for OpenNebula.
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# Depends on the following packages (as of CentOS 8):
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# qemu-img util-linux coreutils dnf curl e2fsprogs
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# Run locally (without network) with:
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# qemu-system-x86_64 -enable-kvm -m 1G -drive file=$IMAGE,format=qcow2
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set -e
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set -x
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# XXX: Handle command-line arguments?
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RELEASE=8
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ARCH=x86_64
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IMAGE_PATH=centos-$RELEASE-$(date --iso-8601).img
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IMAGE_SIZE=10G
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LOOPBACK_DEVICE=/dev/loop0
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# TODO: find the package definition and built ourself, publish in some RPM repository.
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ONE_CONTEXT_RPM_URL="https://github.com/OpenNebula/addon-context-linux/releases/download/v5.10.0/one-context-5.10.0-1.el8.noarch.rpm"
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ONE_CONTEXT_RPM_PATH=/root/one-context.rpm
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cleanup() {
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# The order here is important.
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umount /mnt/dev/pts 2>/dev/null || true
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umount /mnt/dev/shm 2>/dev/null || true
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umount /mnt/dev 2>/dev/null || true
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umount /mnt/proc 2>/dev/null || true
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umount /mnt/run 2>/dev/null || true
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umount /mnt/sys 2>/dev/null || true
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umount /mnt/boot 2>/dev/null || true
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umount /mnt 2>/dev/null || true
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losetup -d "$LOOPBACK_DEVICE"
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}
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run_root() {
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chroot /mnt /usr/bin/env \
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PATH=/sbin:/usr/sbin:/bin:/usr/bin \
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sh -c "$*"
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}
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if [ "$(whoami)" != 'root' ]; then
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echo "This script must be run as root." >&2
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exit 1
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fi
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if [ ! -f '/etc/centos-release' ]; then
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echo "WARNING: this script has been designed to run on a CentOS system." >&2
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echo "WARNING: Not running CentOS. Giving you 5 seconds to abort." >&2
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sleep 5
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fi
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# Create base RAW image (no LOOPBACK support in RHEL/CentOS).
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qemu-img create -f raw "$IMAGE_PATH" "$IMAGE_SIZE"
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losetup "$LOOPBACK_DEVICE" "$IMAGE_PATH"
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# Don't forget to cleanup, even if the script crash.
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trap cleanup EXIT
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# Create partition table, format partitions.
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{
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sfdisk --no-reread "$LOOPBACK_DEVICE" <<EOF
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1M,500M,L,*
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,,L
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EOF
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} || true
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partprobe "$LOOPBACK_DEVICE"
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mkfs.ext4 "${LOOPBACK_DEVICE}p1"
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mkfs.ext4 "${LOOPBACK_DEVICE}p2"
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# Mount partitions, install base OS.
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mount "${LOOPBACK_DEVICE}p2" /mnt
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mkdir /mnt/boot
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mount "${LOOPBACK_DEVICE}p1" /mnt/boot
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dnf -y \
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--releasever=$RELEASE \
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--installroot=/mnt \
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--disablerepo='*' \
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--enablerepo=BaseOS \
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--enablerepo=AppStream \
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--enablerepo=extras \
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--setopt=install_weak_deps=False install \
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bash basesystem systemd systemd-udev dnf centos-release
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mount --bind /dev /mnt/dev
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mount --bind /dev/pts /mnt/dev/pts
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mount --bind /dev/shm /mnt/dev/shm
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mount --bind /proc /mnt/proc
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mount --bind /run /mnt/run
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mount --bind /sys /mnt/sys
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# Guest networking is to be handled by the one-context package.
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# See https://github.com/OpenNebula/addon-context-linux for details.
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# Note: as of writing, one-context does not support NetworkManager or
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# systemd-networkd.
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# Required to resolve package mirror in chroot.
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cp /etc/resolv.conf /mnt/etc/resolv.conf
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# Initialize /etc/hosts.
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cat > /mnt/etc/hosts << EOF
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127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
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::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
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EOF
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# See https://github.com/OpenNebula/addon-context-linux/issues/121 for details.
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# network-scripts.x86_64 : Legacy scripts for manipulating of network devices
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run_root dnf -y install network-scripts
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# Install (magic?) one-context RPM and hope things works as expected.
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curl -L "$ONE_CONTEXT_RPM_URL" > "/mnt$ONE_CONTEXT_RPM_PATH"
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run_root dnf -y install "$ONE_CONTEXT_RPM_PATH"
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run_root rm "$ONE_CONTEXT_RPM_PATH"
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# Install resize2fs, which is required to resize the root file-system.
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run_root dnf -y install e2fsprogs
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# Initalize base services.
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run_root systemd-machine-id-setup
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run_root ln -sf /usr/share/zoneinfo/UTC /etc/localtime
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# Install and configure NTP client.
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run_root dnf install -y chrony
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run_root systemctl enable chronyd.service
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# Install kernel and bootloader.
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# Note: linux-firmware is not required our environment and takes almost 200M
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# uncompressed but is a direct dependency of kernel-core...
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run_root dnf -y install kernel grub2
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# Add support for virtio block devices at boot time.
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cat > /mnt/etc/dracut.conf.d/virtio-blk.conf <<EOF
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add_drivers="virtio-blk"
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EOF
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kernel_version=$(ls /mnt/boot | grep "vmlinuz.*.$ARCH" | cut -d- -f2-)
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run_root dracut --force --kver $kernel_version
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# Configure grub2.
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run_root grub2-install --target=i386-pc "${LOOPBACK_DEVICE}"
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run_root grub2-mkconfig -o /boot/grub2/grub.cfg
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# Install en configure SSH daemon.
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run_root dnf -y install openssh-server
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run_root systemctl enable sshd
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# Generate fstab file.
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boot_uuid=$(blkid --match-tag UUID --output value "${LOOPBACK_DEVICE}p1")
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root_uuid=$(blkid --match-tag UUID --output value "${LOOPBACK_DEVICE}p2")
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cat >>/mnt/etc/fstab <<EOF
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UUID=$boot_uuid /boot ext4 rw,relatime,data=ordered 0 2
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UUID=$root_uuid / ext4 rw,relatime,data=ordered 0 1
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EOF
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# Reset systemd's environment.
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run_root rm -f /etc/machine-id
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run_root touch /etc/machine-id
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rm -f /var/lib/systemd/random-seed
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# Remove temporary files and reclaim freed disk space.
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# Note: build logs could be removed as well.
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run_root dnf clean all
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# Make sure everything is written to disk before exiting.
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sync
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