kubernetes-handbook/tools/flannel/mk-docker-opts.sh

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2017-12-15 19:42:57 +08:00
#!/bin/sh
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)
" >&2
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:?h" 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
;;
[\?h])
usage
;;
esac
done
if [ $indiv_opts = false ] && [ $combined_opts = false ]; then
indiv_opts=true
combined_opts=true
fi
if [ -f "$flannel_env" ]; then
. $flannel_env
fi
if [ -n "$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: $FLANNEL_IPMASQ" >&2
exit 1
fi
fi
eval docker_opts="\$${combined_opts_key}"
if [ "$docker_opts" ]; then
docker_opts="$docker_opts ";
fi
echo -n "" >$docker_env
for opt in $(set | grep "DOCKER_OPT_"); do
OPT_NAME=$(echo $opt | awk -F "=" '{print $1;}');
OPT_VALUE=$(eval echo "\$$OPT_NAME");
if [ "$indiv_opts" = true ]; then
echo "$OPT_NAME=\"$OPT_VALUE\"" >>$docker_env;
fi
docker_opts="$docker_opts $OPT_VALUE";
done
if [ "$combined_opts" = true ]; then
echo "${combined_opts_key}=\"${docker_opts}\"" >>$docker_env
fi