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Added lxc-debian command
From: Daniel Lezcano <dlezcano@fr.ibm.com> Added the script lxc-debian to the package. This command allows to debootstrap a debian minimal and configure a container to run it. Several debian can be installed by invoking the command with a different container name. Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
This commit is contained in:
dlezcano
parent
76a6d713af
commit
6454831676
@ -68,6 +68,7 @@ AC_CONFIG_FILES([
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src/lxc/lxc-ps
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src/lxc/lxc-ls
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src/lxc/lxc-netstat
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src/lxc/lxc-debian
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src/lxc/lxc-checkconfig
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etc/Makefile
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etc/lxc-macvlan.conf
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@ -46,6 +46,7 @@ bin_SCRIPTS = \
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lxc-ps \
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lxc-netstat \
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lxc-ls \
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lxc-debian \
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lxc-checkconfig
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bin_PROGRAMS = \
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283
src/lxc/lxc-debian.in
Executable file
283
src/lxc/lxc-debian.in
Executable file
@ -0,0 +1,283 @@
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#!/bin/bash
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# set -ex
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NAME="debian"
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CONFFILE="lxc.conf"
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MNTFILE="mount.conf"
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UTSNAME=
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IPV4="172.20.0.21"
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GATEWAY="172.20.0.1"
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INTERFACES="/etc/network/interfaces"
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INITTAB="/etc/inittab"
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HOSTNAME="/etc/hostname"
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FSTAB="/etc/fstab"
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CACHE="/var/cache/lxc/debian"
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create() {
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# choose a container name, default is 'debian'
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echo -n "What is the name for the container ? [$NAME] "
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read _NAME_
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if [ ! -z "$_NAME_" ]; then
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NAME=$_NAME_
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fi
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# choose a hostname, default is the container name
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echo -n "What hostname do you wish for this container ? [$NAME] "
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read _UTSNAME_
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if [ ! -z "$_UTSNAME_" ]; then
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UTSNAME=$_UTSNAME_
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else
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UTSNAME=$NAME
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fi
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# choose an ipv4 address, better to choose the same network than
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# your host
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echo -n "What IP address do you wish for this container ? [$IPV4] "
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read _IPV4_
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if [ ! -z "$_IPV4_" ]; then
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IPV4=$_IPV4_
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fi
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# choose the gateway ip address
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echo -n "What is the gateway IP address ? [$GATEWAY] "
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read _GATEWAY_
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if [ ! -z "$_GATEWAY_" ]; then
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GATEWAY=$_GATEWAY_
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fi
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# the rootfs name will be build with the container name
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ROOTFS="./rootfs.$NAME"
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# check if the rootfs does already exist
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if [ ! -e "$ROOTFS" ]; then
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(
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flock -n -x 200
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RES=$?
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if [ "$RES" != "0" ]; then
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echo "Cache repository is busy."
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break
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fi
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echo "Choose your architecture"
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select ARCH in amd64 i386; do
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echo "Architecture $ARCH selected"
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break;
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done
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# check the mini debian was not already downloaded
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echo -n "Checking cache download ..."
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if [ ! -e "$CACHE/rootfs-$ARCH" ]; then
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echo "not cached"
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mkdir -p "$CACHE/rootfs-$ARCH"
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# download a mini debian into a cache
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echo "Downloading debian minimal ..."
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debootstrap --verbose --variant=minbase --arch=$ARCH \
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--include apache,netbase,net-tools,iproute,openssh-server \
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etch $CACHE/rootfs-$ARCH http://ftp.debian.org/debian
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RESULT=$?
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if [ "$RESULT" != "0" ]; then
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echo "Failed to download the rootfs, aborting."
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exit 1
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fi
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echo "Download complete."
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else
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echo "Found."
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fi
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# make a local copy of the minidebian
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echo -n "Copying rootfs ..."
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cp -a $CACHE/rootfs-$ARCH $ROOTFS && echo "Done." || exit
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) 200>/var/lock/subsys/lxc
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fi
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########################################
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# lxc configuration files
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########################################
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# lxc mount point
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cat <<EOF > $MNTFILE
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/dev $(pwd)/$ROOTFS/dev none bind 0 0
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/dev/pts $(pwd)/$ROOTFS/dev/pts none bind 0 0
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/etc/resolv.conf $(pwd)/$ROOTFS/etc/resolv.conf none ro,bind 0 0
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EOF
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# lxc configuration
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cat <<EOF > $CONFFILE
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lxc.utsname = $UTSNAME
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lxc.network.type = veth
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lxc.network.flags = up
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lxc.network.link = br0
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lxc.network.name = eth0
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lxc.mount = $MNTFILE
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lxc.rootfs = $ROOTFS
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EOF
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########################################
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# rootfs configuration files tweak
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########################################
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# inittab
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cat <<EOF > $ROOTFS/$INITTAB
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id:3:initdefault:
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si::sysinit:/etc/init.d/rcS
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l0:0:wait:/etc/init.d/rc 0
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l1:1:wait:/etc/init.d/rc 1
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l2:2:wait:/etc/init.d/rc 2
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l3:3:wait:/etc/init.d/rc 3
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l4:4:wait:/etc/init.d/rc 4
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l5:5:wait:/etc/init.d/rc 5
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l6:6:wait:/etc/init.d/rc 6
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# Normally not reached, but fallthrough in case of emergency.
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z6:6:respawn:/sbin/sulogin
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1:2345:respawn:/sbin/getty 38400 console
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EOF
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# hostname
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cat <<EOF > $ROOTFS/$HOSTNAME
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$UTSNAME
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EOF
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# fstab
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cat <<EOF > $ROOTFS/$FSTAB
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tmpfs /dev/shm tmpfs defaults 0 0
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EOF
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# network
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cat <<EOF > $ROOTFS/$INTERFACES
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auto eth0 lo
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iface eth0 inet static
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address $IPV4
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netmask 255.255.255.0
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broadcast 0.0.0.0
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up route add default gw $GATEWAY
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iface lo inet loopback
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EOF
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# create the container object
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lxc-create -n $NAME -f $CONFFILE
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# remove the configuration files
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rm -f $CONFFILE
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rm -f $MNTFILE
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echo "Done."
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echo -e "\nYou can run your container with the 'lxc-start -n $NAME'\n"
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}
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destroy() {
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echo -n "What is the name for the container ? [$NAME] "
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read _NAME_
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if [ ! -z "$_NAME_" ]; then
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NAME=$_NAME_
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fi
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lxc-destroy -n $NAME
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RETVAL=$?
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if [ ! $RETVAL -eq 0 ]; then
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echo "Failed to destroyed '$NAME'"
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return $RETVAL;
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fi
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ROOTFS="./rootfs.$NAME"
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echo -n "Shall I remove the rootfs [y/n] ? "
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read
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if [ "$REPLY" = "y" ]; then
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rm -rf $ROOTFS
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fi
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return 0
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}
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help() {
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cat <<EOF
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This script is a helper to create debian system containers.
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The script will create the container configuration file following
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the informations submitted interactively with 'lxc-debian create'
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The first creation will download, with debootstrap, a debian
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minimal and store it into a cache.
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The script will copy from the cache the root filesystem to the
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current directory.
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If there is a problem with the container, (bad configuration for
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example), you can destroy the container with 'lxc-debian destroy'
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but without removing the rootfs and recreate it again with
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'lxc-debian create'.
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If you want to create another debian container, call the 'lxc-debian
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create' again, specifying another name and new parameters.
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At any time you can purge the debian cache download by calling
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'lxc-debian purge'
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Have fun :)
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EOF
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}
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purge() {
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if [ ! -e $CACHE ]; then
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exit 0
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fi
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# lock, so we won't purge while someone is creating a repository
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(
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flock -n -x 200
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RES=$?
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if [ "$RES" != "0" ]; then
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echo "Cache repository is busy."
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exit 1
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fi
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echo -n "Purging the download cache..."
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rm -rf $CACHE/* && echo "Done." || exit 1
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exit 0
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) 200>/var/lock/subsys/lxc
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}
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if [ "$(id -u)" != "0" ]; then
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echo "This script should be run as 'root'"
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exit 1
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fi
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case "$1" in
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create)
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create;;
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destroy)
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destroy;;
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help)
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help;;
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purge)
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purge;;
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*)
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echo "Usage: $0 {create|destroy|purge|help}"
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exit 1;;
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esac
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