LXC Setup script

host_setup.sh

#!/bin/bash
# THIS IS A WORK IN PROGRESS, might break things.
# Sets up LXC host configuration in AWS EC2 environments
# Reference: http://www.activestate.com/blog/2011/10/virtualization-ec2-cloud-using-lxc

# Exit NOW because we don't want to blow anything up outside our test systems
# (This is being drafted in a production environment.)
exit 1 

echo 'none  /sys/fs/cgroup   cgroup  defaults 0 0' >> /etc/fstab
mount /sys/fs/cgroup

apt-get install lxc debootstrap bridge-utils dnsmasq

brctl addbr br0
brctl setfd br0 0
ifconfig br0 192.168.3.1 up

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
sysctl -w net.ipv4.ip_forward=1

[ -f /etc/dnsmasq.conf ] && mv /etc/dnsmasq.conf /etc/dnsmasq.conf.orig

cat > /etc/dnsmasq.conf <<END
domain-needed
bogus-priv
interface = br0
listen-address = 127.0.0.1
listen-address = 192.168.3.1
expand-hosts
domain = containers
dhcp-range = 192.168.3.50,192.168.3.200,1h
END

dhcp_conf=`mktemp /tmp/dhcpconf.XXXXX`
cat > $dhcp_conf <<END
prepend domain-name-servers 127.0.0.1;
prepend domain-search "containers.";
END

cat $dhcp_conf /etc/dhcp3/dhclient.conf > ${dhcp_conf}.2
mv ${dhcp_conf}.2 /etc/dhcp3/dhclient.conf

dhclient3 -e IF_METRIC=100 -pf /var/run/dhclient.eth0.pid -lf /var/lib/dhcp3/dhclient.eth0.leases eth0

service dnsmasq restart