Enable internal cluster DNS by deploying CoreDNS in the kube-system namespace. It covers dns queries for both the cluster and external, acting as a proxy with a cache layer in front. Version of CoreDNS hard-coded to 007, image taken from dockerhub. Related-Bug: #1692449 Change-Id: I0a9703b531fe872416dcd79fa7d4d27c1ea61586changes/81/462181/11
Ricardo Rocha
6 years ago
parent
4759a570bd
commit
7c35c8fe40
@ -0,0 +1,112 @@
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#!/bin/sh
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. /etc/sysconfig/heat-params
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CORE_DNS=/etc/kubernetes/manifests/kube-coredns.yaml
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[ -f ${CORE_DNS} ] || {
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echo "Writing File: $CORE_DNS"
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mkdir -p $(dirname ${CORE_DNS})
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cat << EOF > ${CORE_DNS}
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apiVersion: v1
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kind: ConfigMap
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metadata:
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name: coredns
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namespace: kube-system
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data:
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Corefile: |
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.:53 {
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errors
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log stdout
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health
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kubernetes ${DNS_CLUSTER_DOMAIN} {
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cidrs ${PORTAL_NETWORK_CIDR}
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}
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proxy . /etc/resolv.conf
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cache 30
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}
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---
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apiVersion: extensions/v1beta1
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kind: Deployment
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metadata:
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name: coredns
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namespace: kube-system
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labels:
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k8s-app: coredns
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kubernetes.io/cluster-service: "true"
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kubernetes.io/name: "CoreDNS"
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spec:
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replicas: 1
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selector:
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matchLabels:
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k8s-app: coredns
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template:
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metadata:
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labels:
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k8s-app: coredns
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annotations:
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scheduler.alpha.kubernetes.io/critical-pod: ''
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scheduler.alpha.kubernetes.io/tolerations: '[{"key":"CriticalAddonsOnly", "operator":"Exists"}]'
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spec:
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containers:
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- name: coredns
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image: coredns/coredns:007
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imagePullPolicy: Always
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args: [ "-conf", "/etc/coredns/Corefile" ]
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volumeMounts:
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- name: config-volume
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mountPath: /etc/coredns
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ports:
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- containerPort: 53
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name: dns
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protocol: UDP
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- containerPort: 53
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name: dns-tcp
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protocol: TCP
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livenessProbe:
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httpGet:
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path: /health
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port: 8080
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scheme: HTTP
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initialDelaySeconds: 60
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timeoutSeconds: 5
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successThreshold: 1
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failureThreshold: 5
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dnsPolicy: Default
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volumes:
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- name: config-volume
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configMap:
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name: coredns
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items:
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- key: Corefile
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path: Corefile
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: kube-dns
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namespace: kube-system
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labels:
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k8s-app: coredns
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kubernetes.io/cluster-service: "true"
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kubernetes.io/name: "CoreDNS"
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spec:
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selector:
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k8s-app: coredns
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clusterIP: ${DNS_SERVICE_IP}
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ports:
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- name: dns
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port: 53
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protocol: UDP
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- name: dns-tcp
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port: 53
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protocol: TCP
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EOF
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}
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echo "Waiting for Kubernetes API..."
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until curl --silent "http://127.0.0.1:8080/version"
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do
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sleep 5
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done
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kubectl create --validate=false -f $CORE_DNS
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