Merge "Create an LXC create template for machinectl"
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#!/usr/bin/env bash
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# Copyright 2017, Rackspace US, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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set -eu
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## Vars ----------------------------------------------------------------------
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LXC_CACHE_BASE="/var/cache/lxc/"
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LXC_CACHE_PATH="${LXC_CACHE_PATH:-$LXC_CACHE_BASE}"
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LXC_HOOK_DIR="/usr/share/lxc/hooks"
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LXC_TEMPLATE_CONFIG="/usr/share/lxc/config"
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# Default variables
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DOWNLOAD_VARIANT=
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DOWNLOAD_DIST=
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DOWNLOAD_RELEASE=
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DOWNLOAD_ARCH=
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# NOTE(cloudnull): These variables are created magically through the
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# `lxc-create` command and must exist at the top of the file.
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LXC_NAME=
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LXC_PATH=
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LXC_ROOTFS=
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## Functions ------------------------------------------------------------------
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usage() {
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# Return usage information
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cat <<EOF
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LXC container image in machinectl
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Special arguments:
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[ -h | --help ]: Print this help message and exit.
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Required arguments:
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[ --name <name> ]: The container name
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[ -d | --dist <distribution> ]: The name of the distribution
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[ -r | --release <release> ]: Release name/version
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[ -a | --arch <architecture> ]: Architecture of the container
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Optional arguments:
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[ --variant <variant> ]: Variant of the image (default: "default")
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[ -b | --base <base-image> ]: Set the image base name to ANY existing machine image
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EOF
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}
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# Trap all exit signals
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trap EXIT HUP INT TERM
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## Exports --------------------------------------------------------------------
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# Make sure the usual locations are in PATH
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export PATH=$PATH:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/bin
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## Main -----------------------------------------------------------------------
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if ! options=$(getopt -o d:r:a:hl -l dist:,release:,arch:,help,list,variant:,name:,path:,rootfs: -- "$@"); then
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usage
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exit 1
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fi
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eval set -- "$options"
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while :; do
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case "$1" in
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-h|--help) usage && exit 1;;
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-l|--list) DOWNLOAD_LIST_IMAGES="true"; shift 1;;
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-d|--dist) DOWNLOAD_DIST="$2"; shift 2;;
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-r|--release) DOWNLOAD_RELEASE="$2"; shift 2;;
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-a|--arch) DOWNLOAD_ARCH="$2"; shift 2;;
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--variant) DOWNLOAD_VARIANT="$2"; shift 2;;
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--name) LXC_NAME="$2"; shift 2;;
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--path) LXC_PATH="$2"; shift 2;;
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--rootfs) LXC_ROOTFS="$2"; shift 2;;
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*) break;;
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esac
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done
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# Setup the basic information used for machine images
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if [ -z "${LXC_MACHINE_IMAGE:-}" ]; then
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export LXC_MACHINE_IMAGE="${DOWNLOAD_DIST}-${DOWNLOAD_RELEASE}-${DOWNLOAD_ARCH}"
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fi
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# NOTE(cloudnull): If a variant name has not been defined, set it as "default".
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# If a variant is set, amend the machine image name
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if [ -z "${DOWNLOAD_VARIANT:-}" ]; then
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export DOWNLOAD_VARIANT="default"
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fi
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# Setup the basic pathing pointing at the known LXC cache
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LXC_CACHE_PATH="${LXC_CACHE_PATH}/download/${DOWNLOAD_DIST}"
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LXC_CACHE_PATH="${LXC_CACHE_PATH}/${DOWNLOAD_RELEASE}/${DOWNLOAD_ARCH}/"
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export LXC_CACHE_PATH="${LXC_CACHE_PATH}/${DOWNLOAD_VARIANT}"
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# Check for required binaries
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for bin in machinectl; do
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if ! command -V "${bin}" >/dev/null 2>&1; then
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echo "ERROR: Missing required tool: ${bin}" 1>&2
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exit 1
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fi
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done
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# Check for the lxc base image
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if ! btrfs subvolume show "/var/lib/machines/${LXC_MACHINE_IMAGE}" 2>&1 > /dev/null; then
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echo "[FAILURE] Base image does not exist."
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exit 99
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fi
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if btrfs subvolume show "/var/lib/machines/${LXC_NAME}" 2>&1 > /dev/null; then
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echo "[NOTICE] Contianer volume already exists"
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else
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btrfs subvolume snapshot \
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"/var/lib/machines/${LXC_MACHINE_IMAGE}" \
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"/var/lib/machines/${LXC_NAME}"
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echo "[NOTICE] New machine volume created"
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fi
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# Set the LXC_ROOTFS to the machines path
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export LXC_ROOTFS="/var/lib/machines/${LXC_NAME}"
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# Ensuing the container path exists
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mkdir -p "${LXC_ROOTFS}/${LXC_NAME}/dev/pts/"
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mkdir -p "${LXC_PATH}/rootfs"
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cat <<EOF
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=== CONTAINER DETAILS ===
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machine image: ${LXC_MACHINE_IMAGE}
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lxc cache path: ${LXC_CACHE_PATH}
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container path: ${LXC_PATH}
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rootfs path: ${LXC_ROOTFS}
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container name: ${LXC_NAME}
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=== CONTAINER DETAILS ===
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EOF
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if [ ! -e "${LXC_CACHE_PATH}/config" ]; then
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echo "ERROR: meta tarball is missing the configuration file" 1>&2
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exit 1
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fi
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# Build container specific configurations
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echo -e "\n# Distribution configuration" >> "${LXC_PATH}/config"
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cat "${LXC_CACHE_PATH}/config" >> "${LXC_PATH}/config"
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echo -e "\n# Container specific configuration" >> "${LXC_PATH}/config"
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# If an older fstab file exists in the template, extend the lxc config.
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if [ -e "${LXC_CACHE_PATH}/fstab" ]; then
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echo "lxc.mount.fstab = ${LXC_PATH}/fstab" >> "${LXC_PATH}/config"
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fi
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# Set the uts name
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echo "lxc.utsname = ${LXC_NAME}" >> "${LXC_PATH}/config"
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# Look for extra templates
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TEMPLATE_FILES="${LXC_PATH}/config"
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if [ -e "${LXC_CACHE_PATH}/templates" ]; then
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while read -r line; do
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fullpath="${LXC_ROOTFS}/${line}"
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[ ! -e "${fullpath}" ] && continue
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TEMPLATE_FILES="${TEMPLATE_FILES};${fullpath}"
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done < "${LXC_CACHE_PATH}/templates"
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fi
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# Replace variables in all templates
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OLD_IFS=${IFS}
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IFS=";"
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for file in ${TEMPLATE_FILES}; do
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[ ! -f "${file}" ] && continue
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sed -i "s#LXC_NAME#${LXC_NAME}#g" "${file}"
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sed -i "s#LXC_PATH#${LXC_PATH}#g" "${file}"
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sed -i "s#LXC_ROOTFS#${LXC_ROOTFS}#g" "${file}"
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sed -i "s#LXC_TEMPLATE_CONFIG#${LXC_TEMPLATE_CONFIG}#g" "${file}"
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sed -i "s#LXC_HOOK_DIR#${LXC_HOOK_DIR}#g" "${file}"
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done
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IFS=${OLD_IFS}
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# Add the machinectl backend store for the new containe
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if grep -q '^lxc\.rootfs =' "${LXC_PATH}/config"; then
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sed -i "s|^lxc\.rootfs =.*|lxc.rootfs = ${LXC_ROOTFS}|" "${LXC_PATH}/config"
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else
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echo "lxc.rootfs = ${LXC_ROOTFS}" >> "${LXC_PATH}/config"
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fi
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if grep -q '^lxc\.rootfs\.backend =' "${LXC_PATH}/config"; then
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sed -i "s|^lxc\.rootfs\.backend =.*|lxc.rootfs.backend = btrfs|" "${LXC_PATH}/config"
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else
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echo "lxc.rootfs.backend = btrfs" >> "${LXC_PATH}/config"
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fi
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# Prevent mingetty from calling vhangup(2)
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if [ -f "${LXC_ROOTFS}/etc/init/tty.conf" ]; then
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sed -i 's|mingetty|mingetty --nohangup|' "${LXC_ROOTFS}/etc/init/tty.conf"
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fi
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# Display exit message
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if [ -e "${LXC_CACHE_PATH}/create-message" ]; then
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echo -e "\n---"
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cat "${LXC_CACHE_PATH}/create-message"
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fi
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exit 0
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@ -0,0 +1,11 @@
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---
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features:
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- A new LXC container template has been added which will allow us to better
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manage containers on the host machines we support. The new template uses
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the `machinectl` command to create container rootfs using the existing
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cache. This in-turn will provide easier management of container images,
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faster build times, and the ability to instantly clone a container (or a
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given variant) without impacting a containers state. This new lxc container
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create template, and the features it provides, will only impact new
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containers created allowing deployers to safely adopt this change in any
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existing environment.
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@ -39,6 +39,14 @@
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- lxc-files
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- lxc-config
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- name: Create machinectl base template
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copy:
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src: "lxc-machinectl.j2"
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dest: "/usr/share/lxc/templates/lxc-machinectl"
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owner: "root"
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group: "root"
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mode: "0755"
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- name: Drop lxc veth check script
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copy:
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src: "lxc-veth-check.sh"
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