create-vmachine: Initial commit
Dustin C. Hatch
commit
4b357bee36
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#!/bin/bash
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# Creates a new virtual machine from the given stage3 tarball
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DOMNAME="$1"
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STAGE_TBZ="$2"
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VMNAME=$(echo "${DOMNAME}" | tr '[:upper:]' '[:lower:]')
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VM_FQDN="${VMNAME}.$(hostname -d)"
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VG=vmachines
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POOL=LVM
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DOMXML_TMPL=/etc/libvirt/qemu/_template.xml
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MOUNTPOINT=/mnt/new_vmachine
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PUPPETMASTER=$(hostname -f)
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PORTAGE_PROFILE="default/linux/amd64/13.0"
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PORTDIR=$(portageq envvar PORTDIR)
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DISTDIR=$(portageq envvar DISTDIR)
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PKGDIR=$(portageq envvar PKGDIR)
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if [[ -z $STAGE_TBZ || -z $VMNAME ]]; then
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echo "Usage: $(basename $0) <vmname> <stage3-tarball>" >&2
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exit 1
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fi
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set -e
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if lvdisplay ${VG}/${VMNAME} >/dev/null 2>&1; then
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echo "ERROR: Logical volume ${VMNAME} already exists in group ${VG}" >&2
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exit 2
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fi
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echo "Creating storage volume..."
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virsh -c qemu:///system vol-create-as ${POOL} ${VMNAME} 2G
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echo "Creating LVM volumes..."
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pvcreate /dev/${VG}/${VMNAME}
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vgcreate ${VMNAME} /dev/${VG}/${VMNAME}
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lvcreate -nroot -L100M ${VMNAME}
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lvcreate -nhome -L200M ${VMNAME}
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lvcreate -nvar -L400M ${VMNAME}
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lvcreate -nusr -l100%FREE ${VMNAME}
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echo "Creating XFS filesystems..."
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for fs in root home usr var; do
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mkfs.xfs -L$fs -q /dev/${VMNAME}/$fs
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done
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echo "Mounting filesystems..."
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[[ ! -d "${MOUNTPOINT}" ]] && mkdir -p "${MOUNTPOINT}"
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mount /dev/${VMNAME}/root "${MOUNTPOINT}"
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for fs in home usr var; do
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mkdir "${MOUNTPOINT}"/$fs
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mount /dev/${VMNAME}/$fs "${MOUNTPOINT}"/$fs
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done
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mkdir "${MOUNTPOINT}"/run
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mount -t tmpfs tmpfs "${MOUNTPOINT}"/run
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echo "Extracting stage tarball..."
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tar -xjpf "${STAGE_TBZ}" -C "${MOUNTPOINT}"
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echo "Installing critical packages..."
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# Installing packages must be done in a chroot instead of using the $ROOT
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# Portage environment variable because several ebuilds use enewuser/enewgroup
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# to create system users, which creates the user on the host system, not the
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# target system. See Gentoo bug #53269 for details on the problem.
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mkdir "${MOUNTPOINT}"/usr/portage
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mount -obind "${PORTDIR}" "${MOUNTPOINT}"/usr/portage
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mount -obind "${DISTDIR}" "${MOUNTPOINT}"/usr/portage/distfiles
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mount -obind "${PKGDIR}" "${MOUNTPOINT}"/usr/portage/packages
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mount -t tmpfs tmpfs "${MOUNTPOINT}"/tmp
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mount -t proc proc "${MOUNTPOINT}"/proc
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mount -t sysfs sysfs "${MOUNTPOINT}"/sys
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cat <<EOF > "${MOUNTPOINT}"/build-base.sh
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#!/bin/bash
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set -e
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export EMERGE_DEFAULT_OPTS="--binpkg-respect-use=y"
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export FEATURES="-news"
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env-update
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USE=-thin emerge -jkv xfsprogs nfs-utils lvm2
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rc-update add lvm boot
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EOF
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chmod u+x "${MOUNTPOINT}"/build-base.sh
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chroot "${MOUNTPOINT}" /build-base.sh
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rm "${MOUNTPOINT}"/build-base.sh
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echo "Installing Puppet..."
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cat <<EOF > "${MOUNTPOINT}"/build-puppet.sh
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#!/bin/bash
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set -e
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export EMERGE_DEFAULT_OPTS="--binpkg-respect-use=y"
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export FEATURES="-news"
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RUBY_TARGETS=ruby18 USE="-gdbm minimal old-output" emerge -jkv puppet
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rc-update add puppet default
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EOF
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chmod u+x "${MOUNTPOINT}"/build-puppet.sh
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chroot "${MOUNTPOINT}" /build-puppet.sh
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rm "${MOUNTPOINT}"/build-puppet.sh
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echo "Configuring Puppet..."
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cfg_head=$(mktemp)
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cfg_foot=$(mktemp)
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awk '/\[agent\]/ {exit} {print}' "${MOUNTPOINT}"/etc/puppet/puppet.conf > ${cfg_head}
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awk '/\[agent\]/,0' "${MOUNTPOINT}"/etc/puppet/puppet.conf > ${cfg_foot}
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cat ${cfg_head} > "${MOUNTPOINT}"/etc/puppet/puppet.conf
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cat <<EOF >> "${MOUNTPOINT}"/etc/puppet/puppet.conf
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server = ${PUPPETMASTER}
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pluginsync = true
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EOF
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cat ${cfg_foot} >> "${MOUNTPOINT}"/etc/puppet/puppet.conf
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rm ${cfg_head} ${cfg_foot}
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echo "Setting hostname..."
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sed -i "s/localhost/${VMNAME}/" "${MOUNTPOINT}"/etc/conf.d/hostname
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echo "Configuring network..."
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echo 'config_eth0="dhcp"' > "${MOUNTPOINT}"/etc/conf.d/net
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echo 'dhcpcd_eth0="-q"' >> "${MOUNTPOINT}"/etc/conf.d/net
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ln -s net.lo "${MOUNTPOINT}"/etc/init.d/net.eth0
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ln -s /etc/init.d/net.eth0 "${MOUNTPOINT}"/etc/runlevels/default/
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ln -s /etc/init.d/sshd "${MOUNTPOINT}"/etc/runlevels/default/
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echo "Configuring fstab..."
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cat << EOF > "${MOUNTPOINT}"/etc/fstab
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LABEL=root / xfs noatime 0 1
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LABEL=usr /usr xfs noatime 0 2
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LABEL=var /var xfs noatime 0 2
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LABEL=home /home xfs noatime 0 2
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tmpfs /tmp tmpfs defaults 0 0
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EOF
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echo "Creating read-only root filesystem compatibility symlinks..."
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rm -f "${MOUNTPOINT}"/etc/{resolv,ntp}.conf
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rm -f "${MOUNTPOINT}"/etc/mtab
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ln -s /proc/mounts "${MOUNTPOINT}"/etc/mtab
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ln -s /run/resolv.conf "${MOUNTPOINT}"/etc/resolv.conf
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ln -s /run/ntp.conf "${MOUNTPOINT}"/etc/ntp.conf
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echo "Blanking root password..."
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sed -i 's/^root:.*/root::0:0:::::/' "${MOUNTPOINT}"/etc/shadow
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echo "Enabling serial console..."
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sed -i 's/#s0/s0/' "${MOUNTPOINT}"/etc/inittab
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echo "Cleaning up..."
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umount "${MOUNTPOINT}"/usr/portage/{packages,distfiles,}
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rmdir "${MOUNTPOINT}"/usr/portage
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umount "${MOUNTPOINT}"/{tmp,proc,sys,run,usr,var,home,}
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vgchange -an ${VMNAME}
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echo "Creating libvirt domain..."
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m4 -P -DNAME="${DOMNAME}" "${DOMXML_TMPL}" | virsh -c qemu:///system define /dev/stdin
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echo "Starting virtual machine..."
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virsh -c qemu:///system start ${DOMNAME}
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