mkvm: Add script to create stand-alone Gentoo VMs
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#!/bin/sh
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usage() {
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echo "usage: ${0##*/} [options] name [stage_tarball [custom_script]]"
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}
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usage_full() {
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usage
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printf '
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Create a libvirt virtual machine running Gentoo Linux
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positional arguments:
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name The libvirt domain name for the VM
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stage_tarball Path to the Gentoo stage tarball to extract to the
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virtual machine filesystem
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custom_script Path to a script to run in the virtual machine chroot
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before powering it on
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optional arguments:
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-h, --help show this help message and exit
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--hostname, -H The hostname of the VM (defaults to the libvirt
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domain name, in all lower case)
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--kernel-pkg, -K Path to a tarball containing a kernel and modules
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--pool, -p The libvirt storage pool in which to create the
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virtual disk
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--disk-size The size of virtual disk to create (default 6 GB)
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--disk-format The image format of the virtual disk (default qcow2)
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--vram, -r The amount of RAM to allocate to the VM
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--vcpus, -c The number of virtual CPUs to allocate to the VM
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--vnet, -n The network adapter on the host to connect to the VM
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--timezone, -Z The timezone to set in the VM
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'
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}
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invalid_arg() {
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usage >&2
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echo "${0##*/}: Unrecognized argument: $1" >&2
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exit 2;
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}
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while [ $# -gt 0 ]; do
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case $1 in
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--hostname|-H)
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shift
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VHOSTNAME=$1
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shift
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;;
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--kernel-pkg|-K)
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shift
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KERNEL_PKG=$1
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shift
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;;
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--pool|-p)
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shift
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POOL=$1
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shift
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;;
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--disk-size|-s)
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shift
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VDISKSIZE=$1
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shift
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;;
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--disk-format|-f)
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shift
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VDISKFORMAT=$1
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shift
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;;
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--vram|-r)
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shift
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VRAM=$1
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shift
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;;
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--vcpus|-c)
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shift
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VCPUS=$1
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shift
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;;
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--vnet|-n)
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shift
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VNET=$1
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shift
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;;
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--timezone|-Z)
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shift
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TIMEZONE=$1
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shift
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;;
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--help|-h)
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usage_full
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exit 0
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;;
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-*)
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invalid_arg $1
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;;
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*)
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if [ -z "${DOMNAME}" ]; then
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DOMNAME=$1
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shift
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elif [ -z "${STAGE_TBZ}" ]; then
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STAGE_TBZ=$1
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shift
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elif [ -z "${CUSTOMIZE}" ]; then
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CUSTOMIZE=$1
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shift
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else
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invalid_arg $1
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fi
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;;
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esac
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done
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set -e
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if [ -z "${DOMNAME}" ]; then
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usage >&2
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exit 2
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fi
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: ${VHOSTNAME:=$(printf "${DOMNAME}" | tr '[A-Z]' '[a-z]')}
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: ${POOL:=default}
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: ${TIMEZONE:=America/Chicago}
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unset $(env | awk -F= '/^LC_/{print $1}')
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export LC_ALL=C
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mountpoint=${TMPDIR:-/tmp}/${VHOSTNAME}
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mkdir ${mountpoint}
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virsh vol-create-as ${POOL} ${DOMNAME}.img \
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--capacity ${VDISKSIZE:-6G} \
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--format ${VDISKFORMAT:-qcow2}
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vol_path=$(virsh vol-path ${DOMNAME}.img ${POOL})
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echo 'Creating logical volumes and filesystems ...'
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i=$(pgrep -fa ^nbd | sort -k2r | sed -rn '1s/[0-9]+\s+nbd//p')
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blkdev=/dev/nbd$((${i:--1} + 1))
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unset i
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sudo /bin/sh -e <<EOS
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qemu-nbd -c ${blkdev} ${vol_path}
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sgdisk -a 4096 -Z -g \
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-n 1::+1M \
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-t 1:EF02 \
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-c 1:'BIOS boot partition' \
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-n 2::+32M \
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-c 2:'Linux filesystem' \
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-n 3:: \
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-t 3:8E00 \
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-c 3:'Linux LVM' \
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${blkdev}
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pvscan > /dev/null
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pvcreate ${blkdev}p3
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vgcreate ${VHOSTNAME} ${blkdev}p3
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lvcreate -nswap -L1G ${VHOSTNAME}
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lvcreate -nroot -L300M ${VHOSTNAME}
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lvcreate -nusr -L1200M ${VHOSTNAME}
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lvcreate -nvar -L600M ${VHOSTNAME}
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lvcreate -nopt -L100M ${VHOSTNAME}
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lvcreate -nhome -L100M ${VHOSTNAME}
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mkswap -Lswap /dev/${VHOSTNAME}/swap
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mkfs.ext4 -q -Lboot ${blkdev}p2
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for v in root usr var opt home; do
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mkfs.xfs -q -L\$v /dev/${VHOSTNAME}/\$v
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done
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EOS
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[ -z "${STAGE_TBZ}" ] && exit 0
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echo 'Mounting filesystems ...'
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sudo /bin/sh -e <<EOS
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mount /dev/${VHOSTNAME}/root ${mountpoint}
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install -d ${mountpoint}/boot
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mount ${blkdev}p2 ${mountpoint}/boot
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for v in usr var opt home; do
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install -d ${mountpoint}/\$v
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mount /dev/${VHOSTNAME}/\$v ${mountpoint}/\$v
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done
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EOS
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echo 'Extracting stage tarball ...'
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sudo tar -xaf "${STAGE_TBZ}" -C ${mountpoint}
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echo 'Configuring system ...'
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sudo /bin/sh -e <<EOS
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mount -t proc proc ${mountpoint}/proc
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mount -t sysfs sysfs ${mountpoint}/sys
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mount -obind /dev ${mountpoint}/dev
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chroot ${mountpoint} grub2-install ${blkdev}
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cat > ${mountpoint}/boot/grub/grub.cfg <<EOF
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timeout=1
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menuentry 'Gentoo Linux' {
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root=hd0,gpt2
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linux /vmlinuz root=/dev/${VHOSTNAME}/root dolvm net.ifnames=0 quiet
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initrd /initramfs
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}
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EOF
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sed -i s/localhost/${VHOSTNAME}/ ${mountpoint}/etc/conf.d/hostname
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cat > ${mountpoint}/etc/fstab <<EOF
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LABEL=swap none swap sw 0 0
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LABEL=boot /boot ext4 noauto,noatime 1 2
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/dev/${VHOSTNAME}/root / xfs ro,noatime 0 1
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/dev/${VHOSTNAME}/usr /usr xfs ro,noatime 0 2
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/dev/${VHOSTNAME}/var /var xfs noatime 0 2
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/dev/${VHOSTNAME}/opt /opt xfs ro,noatime 0 2
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/dev/${VHOSTNAME}/home /home xfs noatime 0 2
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tmpfs /tmp tmpfs defaults 0 0
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EOF
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rm -rf ${mountpoint}/run/openrc
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ln -snf /proc/self/mounts ${mountpoint}/etc/mtab
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ln -snf /run/resolv.conf ${mountpoint}/etc/resolv.conf
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ln -snf /run/ntp.conf ${mountpoint}/etc/ntp.conf
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ln -snf /usr/share/zoneinfo/${TIMEZONE} ${mountpoint}/etc/localtime
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echo ${TIMEZONE} > ${mountpoint}/etc/timezone
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passwd -R ${mountpoint} -d root
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EOS
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if [ -n "${KERNEL_PKG}" ]; then
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echo 'Extracting kernel package ...'
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sudo tar --no-same-owner --no-same-permissions --strip-components=1 \
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--dereference -xaf "${KERNEL_PKG}" -C ${mountpoint}
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fi
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if [ -f "${CUSTOMIZE}" ]; then
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echo 'Customizing ...'
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sudo /bin/sh "${CUSTOMIZE}"
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fi
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echo 'Cleaning up ...'
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awk '$5~/'${VHOSTNAME}'/{print $5}' /proc/self/mountinfo | tac \
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| xargs sudo umount
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sudo vgchange -an ${VHOSTNAME}
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sudo qemu-nbd -d ${blkdev}
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virt-install --name ${DOMNAME} \
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--ram ${VRAM:-1024} \
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--vcpus ${VCPUS:-2} \
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--os-type linux \
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--os-variant rhel7 \
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--boot hd \
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--disk ${vol_path} \
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--network bridge=${VNET:-br0} \
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--graphics vnc \
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--video cirrus \
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--memballoon model=virtio \
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--noautoconsole
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rmdir ${mountpoint}
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