Bring up IPv6-enabled docker container

container-up.sh

#!/bin/bash
#
# Jeff Loughridge
# July 2014
# jeffl at brooksconsulting-llc.com

# first argument to script must be IPv6 address from DO-allocated
# space that is not part of the first /126 (e.g. 0x4 to 0xF as last
# hex character

IPV6_ADDRESS=$1

if [ -z "$IPV6_ADDRESS" ]; then
  echo "please specify IPv6 address for container's eth0"
  exit 1
fi

echo "container eth0: $IPV6_ADDRESS"

# get docker0's link local address
LINK_LOCAL=$( \
  ip addr show docker0 | \
   grep "inet6 fe80" | \
    awk '{print $2}' | \
      sed 's/\/.*//' \
)

echo "docker0 link local: $LINK_LOCAL"

docker run -i -t \
   --lxc-conf="lxc.network.flags = up" \
   --lxc-conf="lxc.network.ipv6 = $IPV6_ADDRESS/126" \
   --lxc-conf="lxc.network.ipv6.gateway = $LINK_LOCAL" busybox:ubuntu-14.04 /bin/sh

Very good.