安装最新版CoreDNS

安装最新版CoreDNS（不建议） git clone https://github.com/coredns/deployment.git

cd deployment/kubernetes

./deploy.sh 10.9.0.0/24 cluster.local | kubectl apply -f -

./deploy.sh -s -i 10.96.0.10 | kubectl apply -f - serviceaccount/coredns created clusterrole.rbac.authorization.k8s.io/system:coredns created clusterrolebinding.rbac.authorization.k8s.io/system:coredns created configmap/coredns created deployment.apps/coredns created service/kube-dns created 查看状态

kubectl get po -n kube-system -l k8s-app=kube-dns

NAME READY STATUS RESTARTS AGE coredns-85b4878f78-h29kh 1/1 Running 0 8h

校验是否成功

部署curl

apiVersion: v1
kind: Pod
metadata:
  name: busybox
  namespace: default
spec:
  containers:
  - name: busybox
    image: yauritux/busybox-curl
    command:
      - sleep
      - "3600"
    imagePullPolicy: IfNotPresent
  restartPolicy: Always

进入容器 kubectl exec -it busybox -- /bin/sh

测试已部署的 get18600 是否可访问

curl get18600.default.svc:18600

DNS服务是Kubernetes赖以实现服务发现的核心组件之一，默认情况下只会创建一个DNS Pod，在生产环境中我们需要对coredns进行扩容。 有两种方式：

手动扩容 kubectl –namespace=kube-system scale deployment coredns –replicas= 使用DNS Horizontal Autoscaler