LXC (Linux Containers Installation)

README

This works under Ubuntu 10.10. I tried under 10.04 LTS but the Ubuntu templates are not there. Investigating.

[ Leaving this link here for reference in case I need to do apt-get upgrade. @ohloh recommends it
http://sourceforge.net/mailarchive/message.php?msg_id=26885493 ]

To make things easy have libvirt installed ie.

sudo apt-get install libvirt-bin

Otherwise you will need to set up bridges, iptables, dnsmasq. 

Once that is done. Back up 

/etc/libvirt/qemu/networks/default.xml

Then type

virsh net-destroy default

then change the 192.168.122 in default.xml to your net of choice
copy to /etc/libvirt/qemu/networks/default.xml

virsh net-create default
virsh net-autostart default

Make sure

ifconfig virbr0 

has the right IP

Then

apt-get install lxc
mkdir /cgroup
echo "none /cgroup cgroup defaults 0 0" >> /etc/fstab
mount /cgroup

==> Create a base box

- lxc-create -n base -t ubuntu
- let it rip

If you want additional bridges

- add a bridge e.g. 
- brctl addbr br100
- ifconfig br100 inet 172.16.100.1/24

To configure networking for the box in 
/var/lib/lxc/basebox/config add these lines

lxc.network.type = veth
lxc.network.flags = up
lxc.network.name = eth0
lxc.network.link = virbr0

You can add additional network interfaces by adding more e.g.

lxc.network.type = veth
lxc.network.flags = up
lxc.network.name = eth1
lxc.network.link = br100

then lxc-start -n basebox machine should boot up within 
a second or so :D. Root password is root.


==================================================================================

To create boxes I use a following Bash script

#!/bin/sh

if [ $# -ne 1 ]; then
   echo "Enter box name "
   exit 1
fi

ORIG_BOX="base"

cp -a $ORIG_BOX ${1}

sed -i "s/$ORIG_BOX/${1}/g" ${1}/config ${1}/fstab ${1}/rootfs/etc/hostname

sh mounts.sh ${1}

===============================================

mounts.sh mounts file systems from a local box onto the new box. That way I can avoid using NFS

mount -B /local/cache/apt /home/lxc/${1}/rootfs/var/cache/apt/archives