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add lxc-cirros
Add a template to create a cirros container. One great thing about cirros is that the image you download is 3.5M. Thanks smoser! Note by default /etc/inittab doesn't have a /dev/console entry, so you don't get a login on the lxc-start console. Adding console::respawn:/sbin/getty 115200 console makes that work, but ctrl-c still gets forwarded to init which then reboots. So I didn't bother adding console as part of the template (yet). Instead I simply lxc-start -d, then lxc-console. Signed-off-by: Scott Moser <scott.moser@canonical.com> Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
This commit is contained in:
Serge Hallyn
parent
714540763b
commit
58a46e0621
@ -363,6 +363,7 @@ AC_CONFIG_FILES([
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hooks/Makefile
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templates/Makefile
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templates/lxc-cirros
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templates/lxc-debian
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templates/lxc-ubuntu
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templates/lxc-ubuntu-cloud
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@ -11,4 +11,5 @@ templates_SCRIPTS = \
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lxc-busybox \
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lxc-sshd \
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lxc-archlinux \
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lxc-alpine
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lxc-alpine \
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lxc-cirros
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288
templates/lxc-cirros.in
Normal file
288
templates/lxc-cirros.in
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@ -0,0 +1,288 @@
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#!/bin/bash
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# template script for generating ubuntu container for LXC
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#
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# This script consolidates and extends the existing lxc ubuntu scripts
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#
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# Copyright © 2013 Canonical Ltd.
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# Author: Scott Moser <scott.moser@canonical.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2, as
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# published by the Free Software Foundation.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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VERBOSITY=0
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TEMP_D=""
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DOWNLOAD_URL="http://download.cirros-cloud.net/"
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CACHE_D="/var/cache/lxc/cirros"
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CACHE_D="@LOCALSTATEDIR@/cache/lxc/cirros"
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TMP_FILE=""
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UNAME_M=$(uname -m)
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ARCHES=( i386 x86_64 amd64 arm )
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STREAMS=( released devel )
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BUILD="standard"
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DEF_VERSION="released"
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case "${UNAME_M}" in
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i?86) DEF_ARCH="i386";;
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x86_64) DEF_ARCH="x86_64";;
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arm*) DEF_ARCH="arm";;
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*) DEF_ARCH="i386";;
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esac
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error() { echo "$@" 1>&2; }
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errorp() { printf "$@" 1>&2; }
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fail() { [ $# -eq 0 ] || error "$@"; exit 1; }
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failp() { [ $# -eq 0 ] || errorp "$@"; exit 1; }
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inargs() {
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local needle="$1" x=""
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shift
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for x in "$@"; do
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[ "$needle" = "$x" ] && return 0
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done
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return 1
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}
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Usage() {
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cat <<EOF
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${0##*/} [options]
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-a | --arch A architecture to use [${ARCHES}]
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default: ${DEF_ARCH}
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-h | --help this usage
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-v | --verbose increase verbosity
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-S | --auth-key K insert auth key 'K'
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-v | --version V version [${STREAMS[*]}]
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default: ${DEF_VERSION}
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-u | --userdata U user-data file
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EOF
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}
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bad_Usage() { Usage 1>&2; [ $# -eq 0 ] || error "$@"; exit 1; }
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cleanup() {
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[ -z "${TEMP_D}" -o ! -d "${TEMP_D}" ] || rm -Rf "${TEMP_D}"
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[ -z "${TEMP_FILE}" ] || rm -Rf "${TEMP_FILE}"
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}
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debug() {
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local level=${1}; shift;
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[ "${level}" -gt "${VERBOSITY}" ] && return
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error "${@}"
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}
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jsondict() {
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local k="" v="" ret="{"
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for arg in "$@"; do
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k="${arg%%=*}"
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v="${arg#*=}"
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ret="${ret} \"${k}\": \"$v\","
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done
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ret="${ret%,} }"
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echo "$ret"
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}
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copy_configuration()
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{
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local path=$1 rootfs=$2 name=$3 arch=$4 release=$5
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cat >> "$path/config" <<EOF
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# Template used to create this container: cirros
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lxc.rootfs = $rootfs
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#lxc.mount = $path/fstab
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lxc.pivotdir = lxc_putold
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lxc.tty = 4
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lxc.pts = 1024
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lxc.utsname = $name
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lxc.arch = $arch
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lxc.cap.drop = sys_module mac_admin mac_override sys_time
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# When using LXC with apparmor, uncomment the next line to run unconfined:
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#lxc.aa_profile = unconfined
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# To support container nesting on an Ubuntu host, uncomment next two lines:
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#lxc.aa_profile = lxc-container-default-with-nesting
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#lxc.hook.mount = /usr/share/lxc/hooks/mountcgroups
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lxc.cgroup.devices.deny = a
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# Allow any mknod (but not using the node)
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lxc.cgroup.devices.allow = c *:* m
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lxc.cgroup.devices.allow = b *:* m
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# /dev/null and zero
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lxc.cgroup.devices.allow = c 1:3 rwm
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lxc.cgroup.devices.allow = c 1:5 rwm
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# consoles
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lxc.cgroup.devices.allow = c 5:1 rwm
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lxc.cgroup.devices.allow = c 5:0 rwm
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# /dev/{,u}random
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lxc.cgroup.devices.allow = c 1:9 rwm
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lxc.cgroup.devices.allow = c 1:8 rwm
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lxc.cgroup.devices.allow = c 136:* rwm
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lxc.cgroup.devices.allow = c 5:2 rwm
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# rtc
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lxc.cgroup.devices.allow = c 254:0 rwm
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# fuse
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lxc.cgroup.devices.allow = c 10:229 rwm
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# tun
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lxc.cgroup.devices.allow = c 10:200 rwm
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# full
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lxc.cgroup.devices.allow = c 1:7 rwm
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# hpet
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lxc.cgroup.devices.allow = c 10:228 rwm
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# kvm
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lxc.cgroup.devices.allow = c 10:232 rwm
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EOF
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}
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insert_ds() {
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local root_d="$1" dstype="$2" authkey="$3" userdata="$4"
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local sdir="$root_d/var/lib/cloud/seed/nocloud"
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mkdir -p "$sdir" ||
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{ error "failed to make datasource dir $sdir"; return 1; }
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rm -f "$sdir/meta-data" "$sdir/user-data" ||
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{ error "failed to clean old data from $sdir"; return 1; }
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iid="iid-local01"
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jsondict "instance-id=$iid" \
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${authkeys:+"public-keys=${authkeys}"} > "$sdir/meta-data" ||
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{ error "failed to write metadata to $sdir/meta-data"; return 1; }
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[ -z "$userdata" ] ||
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echo "$userdata" > "$sdir/user-data" ||
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{ error "failed to write user-data to $sdir"; return 1; }
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}
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extract_rootfs() {
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local tarball="$1" rootfs_d="$2"
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mkdir -p "${rootfs_d}" ||
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{ error "failed to make rootfs dir ${rootfs_d}"; return 1; }
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tar -C "${rootfs_d}" -Sxzf "${tarball}" ||
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{ error "failed to populate ${rootfs_d}"; return 1; }
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return 0
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}
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download_tarball() {
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local arch="$1" ver="$2" cached="$3" baseurl="$4"
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local out="" outd="" file="" dlpath=""
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file="cirros-$ver-$arch-lxc.tar.gz"
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dlpath="$ver/$file"
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outd="${cached}/${dlpath%/*}"
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if [ -f "$cached/$dlpath" ]; then
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_RET="$cached/$dlpath"
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return 0
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fi
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mkdir -p "${outd}" ||
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{ error "failed to create ${outd}"; return 1; }
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wget "${baseurl%/}/$dlpath" -O "$cached/${dlpath}.$$" &&
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mv "$cached/$dlpath.$$" "$cached/$dlpath" || {
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rm -f "$cached/$dlpath.$$";
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error "failed to download $dlpath";
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return 1;
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}
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_RET="$cached/$dlpath"
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}
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short_opts="a:n:p:S:huV"
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long_opts="arch:,auth-key:,name:,path:,userdata:,verbose,version:"
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getopt_out=$(getopt --name "${0##*/}" \
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--options "${short_opts}" --long "${long_opts}" -- "$@") &&
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eval set -- "${getopt_out}" ||
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bad_Usage
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arch="${DEF_ARCH}"
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version="${DEF_VERSION}"
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authkey_f=""
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authkeys=""
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userdata=""
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seed=true
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path=""
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while [ $# -ne 0 ]; do
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cur=$1; next=$2;
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case "$cur" in
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-a|--arch) arch="$next"; shift;;
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-h|--help) Usage ; exit 0;;
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-n|--name) name="$next"; shift;;
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-v|--verbose) VERBOSITY=$((${VERBOSITY}+1));;
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-S|--auth-key) authkey_f="$next"; shift;;
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-p|--path) path=$next; shift;;
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-v|--version) version=$next; shift;;
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-u|--userdata) userdata="$next"; shift;;
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--) shift; break;;
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esac
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shift;
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done
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[ $# -eq 0 ] || bad_Usage "unexpected arguments: $*"
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[ -n "$path" ] || fail "'path' parameter is required"
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if [ "$(id -u)" != "0" ]; then
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fail "must be run as root"
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fi
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case "$arch" in
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i?86) arch="i386";;
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amd64) arch="x86_65";;
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esac
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inargs "$arch" "${ARCHES[@]}" ||
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fail "bad arch '$arch'. allowed: ${ARCHES[*]}"
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if inargs "$version" "${STREAMS[@]}"; then
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out=$(wget -O - -q "${DOWNLOAD_URL%/}/version/$version") ||
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fail "failed to convert 'version=$version'"
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version="$out"
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fi
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if [ -n "$authkey_f" ]; then
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if [ ! -f "$authkey_f" ]; then
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echo "--auth-key=${authkey_f} must reference a file"
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exit 1
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fi
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authkeys=$(cat "$authkey")
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fi
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trap cleanup EXIT
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download_tarball "$arch" "$version" "${CACHE_D}" "${DOWNLOAD_URL}" || fail
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tarball="$_RET"
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rootfs_d="$path/rootfs"
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extract_rootfs "${tarball}" "${rootfs_d}" || fail
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# oopsie - some cirros tarballs ship random as a blockdev, breaking
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# dropbear.
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if [ -b ${rootfs_d}/dev/random ]; then
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rm -f ${rootfs_d}/dev/random
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rm -f ${rootfs_d}/dev/urandom
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mknod ${rootfs_d}/dev/random c 1 8
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mknod ${rootfs_d}/dev/urandom c 1 9
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chmod 777 ${rootfs_d}/dev/random ${rootfs_d}/dev/urandom
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fi
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if false; then
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insert_ds "$path/rootfs" "nocloud" "$authkeys" "$userdata" ||
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fail "failed to insert userdata to $path/rootfs"
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else
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# disable ec2, because its annoying
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sed -i 's,ec2,,' "$path/rootfs/etc/cirros-init/config"
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fi
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copy_configuration "$path" "$path/rootfs" "$name" "$arch" "$release"
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# vi: ts=4 expandtab
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