kubernetes - nslookup : can't resolve kubernetes. 默认

Question

我正在尝试使用 https://kubernetes.io/docs/tasks/administer-cluster/dns-debugging-resolution/ 在 kubernetes 中学习 DNS

我部署了busybox

kubectl get pods busybox -o wide

NAME      READY     STATUS    RESTARTS   AGE       IP           NODE
busybox   1/1       Running   0          16m       10.200.1.5   worker-1

kubectl exec -ti busybox -- nslookup kubernetes.default

Server:    10.32.0.10
Address 1: 10.32.0.10 kube-dns.kube-system.svc.cluster.local

nslookup: can't resolve 'kubernetes.default'
command terminated with exit code 1

是否需要修改worker-1节点的/etc/resolv.conf文件。目前/etc/resolv.conf 内容如下

nameserver 169.254.169.254
search c.k8s-project-193906.internal google.internal**

还有worker-1的版本
lsb_release -a
没有可用的 LSB 模块。
经销商编号:Ubuntu
说明:Ubuntu 18.04.1 LTS
发布时间:18.04
代号:仿生

请帮我找出导致解析错误的配置。我是否需要更改 resolve.conf 文件并基于什么？

Answer 1

您在最新版本的 busybox docker 镜像中遇到了一个错误。使用标签 busybox:1.28而不是 latest .这个bug link is here :

"Nslookup does not work in latest busybox image"
"1.27/1.28 are working , 1.29/1.29.1 are not"

这里是 失败 与 busybox:latest标签。

$ kubectl run busybox --image busybox:latest --restart=Never --rm -it busybox -- sh
If you don't see a command prompt, try pressing enter.
/ # nslookup kubernetes.default
Server:         10.96.0.10
Address:        10.96.0.10:53

** server can't find kubernetes.default: NXDOMAIN

*** Can't find kubernetes.default: No answer
/ # exit
pod "busybox" deleted

这是相同的命令 成功 与 busybox:1.28标签。

$ kubectl run busybox --image busybox:1.28 --restart=Never --rm -it busybox -- sh
If you don't see a command prompt, try pressing enter.
/ # nslookup kubernetes.default
Server:    10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local

Name:      kubernetes.default
Address 1: 10.96.0.1 kubernetes.default.svc.cluster.local
/ # exit
pod "busybox" deleted