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kubernetes: Reverse zone fall through (#53)

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* add cidr default, move to  getopts

* add ipv6 zone

* update readme
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Chris O'Haver 2018-01-19 12:11:55 -05:00 • committed by GitHub
parent 29da3093c4
commit ba02ac313f
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3 changed files with 43 additions and 14 deletions
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50
kubernetes/deploy.sh
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@ -2,23 +2,51 @@
# Deploys CoreDNS to a cluster currently running Kube-DNS.
SERVICE_CIDR=$1
POD_CIDR=$2
CLUSTER_DNS_IP=$3
CLUSTER_DOMAIN=${4:-cluster.local}
YAML_TEMPLATE=${5:-`pwd`/coredns.yaml.sed}
show_help () {
cat << USAGE
usage: $0 [ -r REVERSE-CIDR ] [ -i DNS-IP ] [ -d CLUSTER-DOMAIN ] [ -t YAML-TEMPLATE ]
if [[ -z $SERVICE_CIDR ]]; then
echo "Usage: $0 SERVICE-CIDR [ POD-CIDR ] [ DNS-IP ] [ CLUSTER-DOMAIN ] [ YAML-TEMPLATE ]"
exit 1
-r : Define a reverse zone for the given CIDR. You may specifcy this option more
than once to add multiple reverse zones. If no reverse CIDRs are defined,
then the default is to handle all reverse zones (i.e. in-addr.arpa and ip6.arpa)
-i : Specify the cluster DNS IP address. If not specificed, the IP address of
the existing "kube-dns" service is used, if present.
USAGE
exit 0
}
# Simple Defaults
CLUSTER_DOMAIN=cluster.local
YAML_TEMPLATE=`pwd`/coredns.yaml.sed
# Get Opts
while getopts "hr:i:d:t:" opt; do
case "$opt" in
h) show_help
;;
r) REVERSE_CIDRS="$REVERSE_CIDRS $OPTARG"
;;
i) CLUSTER_DNS_IP=$OPTARG
;;
d) CLUSTER_DOMAIN=$OPTARG
;;
t) YAML_TEMPLATE=$OPTARG
;;
esac
done
# Conditional Defaults
if [[ -z $REVERSE_CIDRS ]]; then
REVERSE_CIDRS="in-addr.arpa ip6.arpa"
fi
if [[ -z $CLUSTER_DNS_IP ]]; then
# Default IP to kube-dns IP
CLUSTER_DNS_IP=$(kubectl get service --namespace kube-system kube-dns -o jsonpath="{.spec.clusterIP}")
if [ $? -ne 0 ]; then
>&2 echo "Error! The IP address for DNS service couldn't be determined automatically. Please specify the DNS-IP in paramaters."
>&2 echo "Error! The IP address for DNS service couldn't be determined automatically. Please specify the DNS-IP with the '-i' option."
exit 2
fi
fi
sed -e s/CLUSTER_DNS_IP/$CLUSTER_DNS_IP/g -e s/CLUSTER_DOMAIN/$CLUSTER_DOMAIN/g -e s?SERVICE_CIDR?$SERVICE_CIDR?g -e s?POD_CIDR?$POD_CIDR?g $YAML_TEMPLATE
sed -e s/CLUSTER_DNS_IP/$CLUSTER_DNS_IP/g -e s/CLUSTER_DOMAIN/$CLUSTER_DOMAIN/g -e "s?REVERSE_CIDRS?$REVERSE_CIDRS?g" $YAML_TEMPLATE