core@core-1-94 ~ $ kubectl exec -it busybox -- nslookup kubernetes
Server: 10.100.0.10
Address 1: 10.100.0.10
nslookup: can't resolve 'kubernetes'
core@core-1-94 ~ $ kubectl get svc --namespace=kube-system
NAME LABELS SELECTOR IP(S) PORT(S)
kube-dns k8s-app=kube-dns,kubernetes.io/cluster-service=true,kubernetes.io/name=KubeDNS k8s-app=kube-dns 10.100.0.10 53/UDP
53/TCP
kube-ui k8s-app=kube-ui,kubernetes.io/cluster-service=true,kubernetes.io/name=KubeUI k8s-app=kube-ui 10.100.110.236 80/TCP
core@core-1-94 ~ $ kubectl exec -it busybox -- nslookup kubernetes 10.100.0.10:53
Server: 10.100.0.10
Address 1: 10.100.0.10
nslookup: can't resolve 'kubernetes'
core@core-1-94 ~ $ kubectl get endpoints --namespace=kube-system
NAME ENDPOINTS
kube-dns 10.244.31.16:53,10.244.31.16:53
kube-ui 10.244.3.2:8080
core@core-1-94 ~ $ kubectl exec -it busybox -- nslookup kubernetes 10.244.31.16:53
Server: 10.244.31.16
Address 1: 10.244.31.16
Name: kubernetes
Address 1: 10.100.0.1
我认为 kube-dns 的服务不可用 .
skydns-svc.yaml ：
apiVersion: v1
kind: Service
metadata:
name: kube-dns
namespace: kube-system
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
kubernetes.io/name: "KubeDNS"
spec:
selector:
k8s-app: kube-dns
clusterIP: 10.100.0.10
ports:
- name: dns
port: 53
protocol: UDP
- name: dns-tcp
port: 53
protocol: TCP
谁可以帮忙？
1 回答
要使DNS正常工作，需要在启动时传递kubelet标志--cluster_dns =和--cluster_domain = cluster.local . 此标志未包含在the set of flags passed to the kubelet中，因此kubelet赢得了为名称解析服务创建的't try to contact the DNS pod that you' ve . 要解决此问题，您可以修改脚本以将这两个标志添加到kubelet，然后在创建DNS服务时，您需要确保将传递给--cluster_dns标志的相同IP地址设置为portalIP服务规范的字段，如this . 有关任何其他信息，您可以查看it .