Assigning a MAC to docker0 in /etc/sysconfig/docker. Hacky, fix for ancient docker ~1.6 issue

gistfile1.sh

# /etc/sysconfig/docker
#
# Other arguments to pass to the docker daemon process
# These will be parsed by the sysv initscript and appended
# to the arguments list passed to docker -d

other_args="--bridge=docker0"
DOCKER_CERT_PATH=/etc/docker

# Resolves: rhbz#1176302 (docker issue #407)
DOCKER_NOWARN_KERNEL_VERSION=1

# Location used for temporary files, such as those created by
# # docker load and build operations. Default is /var/lib/docker/tmp
# # Can be overriden by setting the following environment variable.
# # DOCKER_TMPDIR=/var/tmp

# Work-around a linux bridging issue that can cause network interruptions as
# containers are started or stopped.
#
# This is a bit heavy-handed as it runs every time the docker init.d script
# runs.  But it works, and it's an easy way to make sure docker0 is configured
# before docker is started.
#
# see https://github.com/docker/docker/issues/11407
# see http://backreference.org/2010/07/28/linux-bridge-mac-addresses-and-dynamic-ports/
(
	exec > /dev/null
	exec 2> /dev/null

	brctl addbr docker0 || true
	ip addr add 172.17.42.1/16 dev docker0 || true

	# add a dummy interface to the bridge
	ip link add dummy0 type dummy || true
	brctl addif docker0 dummy0 || true

	# set the bridge's MAC to match the enslaved dummy MAC
	ip link set docker0 address $(cat /sys/class/net/dummy0/address)

	ip link set dev docker0 up
)