coredns 更新部署

下载下面的两个文件

https://github.com/coredns/deployment/tree/master/kubernetes

wget https://raw.githubusercontent.com/coredns/deployment/master/kubernetes/coredns.yaml.sed

wget https://raw.githubusercontent.com/coredns/deployment/master/kubernetes/deploy.sh

coredns.yaml.sed文件

apiVersion: v1
kind: ServiceAccount
metadata:name: corednsnamespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:labels:kubernetes.io/bootstrapping: rbac-defaultsname: system:coredns
rules:- apiGroups:- ""resources:- endpoints- services- pods- namespacesverbs:- list- watch- apiGroups:- discovery.k8s.ioresources:- endpointslicesverbs:- list- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:annotations:rbac.authorization.kubernetes.io/autoupdate: "true"labels:kubernetes.io/bootstrapping: rbac-defaultsname: system:coredns
roleRef:apiGroup: rbac.authorization.k8s.iokind: ClusterRolename: system:coredns
subjects:
- kind: ServiceAccountname: corednsnamespace: kube-system
---
apiVersion: v1
kind: ConfigMap
metadata:name: corednsnamespace: kube-system
data:Corefile: |.:53 {errorshealth {lameduck 5s}readykubernetes CLUSTER_DOMAIN REVERSE_CIDRS {fallthrough in-addr.arpa ip6.arpa}prometheus :9153forward . UPSTREAMNAMESERVER {max_concurrent 1000}cache 30loopreloadloadbalance}STUBDOMAINS
---
apiVersion: apps/v1
kind: Deployment
metadata:name: corednsnamespace: kube-systemlabels:k8s-app: kube-dnskubernetes.io/name: "CoreDNS"
spec:# replicas: not specified here:# 1. Default is 1.# 2. Will be tuned in real time if DNS horizontal auto-scaling is turned on.strategy:type: RollingUpdaterollingUpdate:maxUnavailable: 1selector:matchLabels:k8s-app: kube-dnstemplate:metadata:labels:k8s-app: kube-dnsspec:priorityClassName: system-cluster-criticalserviceAccountName: corednstolerations:- key: "CriticalAddonsOnly"operator: "Exists"nodeSelector:kubernetes.io/os: linuxaffinity:podAntiAffinity:preferredDuringSchedulingIgnoredDuringExecution:- weight: 100podAffinityTerm:labelSelector:matchExpressions:- key: k8s-appoperator: Invalues: ["kube-dns"]topologyKey: kubernetes.io/hostnamecontainers:- name: corednsimage: coredns/coredns:1.8.4imagePullPolicy: IfNotPresentresources:limits:memory: 170Mirequests:cpu: 100mmemory: 70Miargs: [ "-conf", "/etc/coredns/Corefile" ]volumeMounts:- name: config-volumemountPath: /etc/corednsreadOnly: trueports:- containerPort: 53name: dnsprotocol: UDP- containerPort: 53name: dns-tcpprotocol: TCP- containerPort: 9153name: metricsprotocol: TCPsecurityContext:allowPrivilegeEscalation: falsecapabilities:add:- NET_BIND_SERVICEdrop:- allreadOnlyRootFilesystem: truelivenessProbe:httpGet:path: /healthport: 8080scheme: HTTPinitialDelaySeconds: 60timeoutSeconds: 5successThreshold: 1failureThreshold: 5readinessProbe:httpGet:path: /readyport: 8181scheme: HTTPdnsPolicy: Defaultvolumes:- name: config-volumeconfigMap:name: corednsitems:- key: Corefilepath: Corefile
---
apiVersion: v1
kind: Service
metadata:name: kube-dnsnamespace: kube-systemannotations:prometheus.io/port: "9153"prometheus.io/scrape: "true"labels:k8s-app: kube-dnskubernetes.io/cluster-service: "true"kubernetes.io/name: "CoreDNS"
spec:selector:k8s-app: kube-dnsclusterIP: CLUSTER_DNS_IPports:- name: dnsport: 53protocol: UDP- name: dns-tcpport: 53protocol: TCP- name: metricsport: 9153protocol: TCP

deploy.sh 文件

#!/bin/bash# Deploys CoreDNS to a cluster currently running Kube-DNS.show_help () {
cat << USAGE
usage: $0 [ -r REVERSE-CIDR ] [ -i DNS-IP ] [ -d CLUSTER-DOMAIN ] [ -t YAML-TEMPLATE ]-r : Define a reverse zone for the given CIDR. You may specify this option morethan once to add multiple reverse zones. If no reverse CIDRs are defined,then the default is to handle all reverse zones (i.e. in-addr.arpa and ip6.arpa)-i : Specify the cluster DNS IP address. If not specified, the IP address ofthe existing "kube-dns" service is used, if present.-s : Skips the translation of kube-dns configmap to the corresponding CoreDNS Corefile configuration.USAGE
exit 0
}# Simple Defaults
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"
CLUSTER_DOMAIN=cluster.local
YAML_TEMPLATE="$DIR/coredns.yaml.sed"
STUBDOMAINS=""
UPSTREAM=\\/etc\\/resolv\.conf# Translates the kube-dns ConfigMap to equivalent CoreDNS Configuration.
function translate-kube-dns-configmap {kube-dns-upstreamnameserver-to-corednskube-dns-stubdomains-to-coredns
}function kube-dns-upstreamnameserver-to-coredns {up=$(kubectl -n kube-system get configmap kube-dns  -ojsonpath='{.data.upstreamNameservers}' 2> /dev/null | tr -d '[",]')if [[ ! -z ${up} ]]; thenUPSTREAM=${up}fi
}function kube-dns-stubdomains-to-coredns {STUBDOMAIN_TEMPLATE='SD_DOMAIN:53 {errorscache 30loopforward . SD_DESTINATION {max_concurrent 1000}}'function dequote {str=${1#\"} # delete leading quotestr=${str%\"} # delete trailing quoteecho ${str}}function parse_stub_domains() {sd=$1# get keys - each key is a domainsd_keys=$(echo -n $sd | jq keys[])# For each domain ...for dom in $sd_keys; dodst=$(echo -n $sd | jq '.['$dom'][0]') # get the destinationdom=$(dequote $dom)dst=$(dequote $dst)sd_stanza=${STUBDOMAIN_TEMPLATE/SD_DOMAIN/$dom} # replace SD_DOMAINsd_stanza=${sd_stanza/SD_DESTINATION/$dst} # replace SD_DESTINATIONecho "$sd_stanza"done
}sd=$(kubectl -n kube-system get configmap kube-dns  -ojsonpath='{.data.stubDomains}' 2> /dev/null)STUBDOMAINS=$(parse_stub_domains "$sd")
}# Get Opts
while getopts "hsr:i:d:t:k:" opt; docase "$opt" inh)  show_help;;s)  SKIP=1;;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 ]]; thenREVERSE_CIDRS="in-addr.arpa ip6.arpa"
fi
if [[ -z $CLUSTER_DNS_IP ]]; then# Default IP to kube-dns IPCLUSTER_DNS_IP=$(kubectl get service --namespace kube-system kube-dns -o jsonpath="{.spec.clusterIP}")if [ $? -ne 0 ]; then>&2 echo "Error! The IP address for DNS service couldn't be determined automatically. Please specify the DNS-IP with the '-i' option."exit 2fi
fiif [[ "${SKIP}" -ne 1 ]] ; thentranslate-kube-dns-configmap
fiorig=$'\n'
replace=$'\\\n'
sed -e "s/CLUSTER_DNS_IP/$CLUSTER_DNS_IP/g" \-e "s/CLUSTER_DOMAIN/$CLUSTER_DOMAIN/g" \-e "s?REVERSE_CIDRS?$REVERSE_CIDRS?g" \-e "s@STUBDOMAINS@${STUBDOMAINS//$orig/$replace}@g" \-e "s/UPSTREAMNAMESERVER/$UPSTREAM/g" \"${YAML_TEMPLATE}"

部署

chmod +x deploy.sh
./deploy.sh -i 10.96.0.10 > coredns.yml

执行上面脚本依赖jquery,没有安装需要提前安装

yum install -y jq

执行脚本后生成coredns.yml文件

执行前注意cm coredns 的配置信息避免丢失

 kubectl apply -f coredns.yml

部署发现报错，因为我的kube-dns的集群ip为10.1.0.10,而非默认的10.96.0.10，所以需要重新生成coredns.yml

./deploy.sh -i 10.1.0.10 > coredns.yml

 kubectl apply -f coredns.yml

coredns的镜像版本已经从之前的1.6.7升级到1.8.4最新版

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coredns 更新部署

下载下面的两个文件

coredns.yaml.sed文件

deploy.sh 文件

部署

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