#!/bin/bash usage() { echo "$0 [-f FLANNEL-ENV-FILE] [-d DOCKER-ENV-FILE] [-i] [-c] [-m] [-k COMBINED-KEY] Generate Docker daemon options based on flannel env file OPTIONS: -f Path to flannel env file. Defaults to /run/flannel/subnet.env -d Path to Docker env file to write to. Defaults to /run/docker_opts.env -i Output each Docker option as individual var. e.g. DOCKER_OPT_MTU=1500 -c Output combined Docker options into DOCKER_OPTS var -k Set the combined options key to this value (default DOCKER_OPTS=) -m Do not output --ip-masq (useful for older Docker version) " >/dev/stderr exit 1 } flannel_env="/run/flannel/subnet.env" docker_env="/run/docker_opts.env" combined_opts_key="DOCKER_OPTS" indiv_opts=false combined_opts=false ipmasq=true while getopts "f:d:icmk:" opt; do case $opt in f) flannel_env=$OPTARG ;; d) docker_env=$OPTARG ;; i) indiv_opts=true ;; c) combined_opts=true ;; m) ipmasq=false ;; k) combined_opts_key=$OPTARG ;; \?) usage ;; esac done if [ $indiv_opts = false ] && [ $combined_opts = false ]; then indiv_opts=true combined_opts=true fi if [ -f "$flannel_env" ]; then source $flannel_env fi if [ -n "$FLANNEL_SUBNET" ]; then DOCKER_OPT_BIP="--bip=$FLANNEL_SUBNET" fi if [ -n "$FLANNEL_MTU" ]; then DOCKER_OPT_MTU="--mtu=$FLANNEL_MTU" fi if [ -n "$FLANNEL_IPMASQ" ] && [ $ipmasq = true ] ; then if [ "$FLANNEL_IPMASQ" = true ] ; then DOCKER_OPT_IPMASQ="--ip-masq=false" elif [ "$FLANNEL_IPMASQ" = false ] ; then DOCKER_OPT_IPMASQ="--ip-masq=true" else echo "Invalid value of FLANNEL_IPMASQ: $FLANNEL_IPMASQ" > /dev/stderr exit 1 fi fi eval docker_opts="\$${combined_opts_key}" docker_opts+=" " echo -n "" >$docker_env for opt in $(compgen -v DOCKER_OPT_); do eval val=\$$opt if [ "$indiv_opts" = true ]; then echo "$opt=\"$val\"" >>$docker_env fi docker_opts+="$val " done if [ "$combined_opts" = true ]; then echo "${combined_opts_key}=\"${docker_opts}\"" >>$docker_env fi