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https://github.com/notherealmarco/coredns-deployment.git
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a6c087005f
* Don't overwrite KUBECONFIG. kubectl already knows to look in $HOME/.kube or use $KUBECONFIG. https://kubernetes.io/docs/tasks/access-application-cluster/configure-access-multiple-clusters/#set-the-kubeconfig-environment-variable * Use $DIR instead of pwd. https://stackoverflow.com/a/246128/1881379 * chmod +x kubernetes/rollback.sh
48 lines
1.3 KiB
Bash
Executable file
48 lines
1.3 KiB
Bash
Executable file
#!/bin/bash
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# Roll back kube-dns to the cluster which has CoreDNS installed.
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set -eo pipefail
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show_help () {
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cat << USAGE
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usage: $0 [ -i DNS-IP ] [ -d CLUSTER-DOMAIN ]
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-i : Specify the cluster DNS IP address. If not specificed, the IP address of
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the existing "kube-dns" service is used, if present.
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-d : Specify the Cluster Domain. Default is "cluster.local"
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USAGE
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exit 0
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}
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# Simple Defaults
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DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"
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CLUSTER_DOMAIN=cluster.local
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YAML_TEMPLATE="$DIR/kube-dns.yaml.sed"
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curl -L https://raw.githubusercontent.com/kubernetes/kubernetes/master/cluster/addons/dns/kube-dns/kube-dns.yaml.base > "$YAML_TEMPLATE"
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# Get Opts
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while getopts "hi:d:" opt; do
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case "$opt" in
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h) show_help
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;;
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i) CLUSTER_DNS_IP=$OPTARG
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;;
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d) CLUSTER_DOMAIN=$OPTARG
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;;
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esac
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done
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if [[ -z $CLUSTER_DNS_IP ]]; then
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# Default IP to kube-dns IP
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CLUSTER_DNS_IP=$(kubectl get service --namespace kube-system kube-dns -o jsonpath="{.spec.clusterIP}")
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if [ $? -ne 0 ]; then
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>&2 echo "Error! The IP address for DNS service couldn't be determined automatically. Please specify the DNS-IP with the '-i' option."
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exit 2
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fi
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fi
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sed -e s/__PILLAR__DNS__SERVER__/${CLUSTER_DNS_IP}/g -e s/__PILLAR__DNS__DOMAIN__/${CLUSTER_DOMAIN}/g ${YAML_TEMPLATE}
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