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Kubernetes nslookup kubernetes.default 失败

转载 作者:行者123 更新时间:2023-12-02 12:25:09 24 4
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我的环境:

OS - CentOS-8.2
Kubernetes Vesion:
Client Version: v1.18.8
Server Version: v1.18.8

我已经成功配置了 Kubernetes 集群(一个主节点和一个工作节点),但是目前在使用以下代码检查 dns 解析时失败了。

apiVersion: v1
kind: Pod
metadata:
name: dnsutils
namespace: default
spec:
containers:
- name: dnsutils
image: gcr.io/kubernetes-e2e-test-images/dnsutils:1.3
command:
- sleep
- "3600"
imagePullPolicy: IfNotPresent
restartPolicy: Always


# kubectl get pods -o wide --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
default dnsutils 1/1 Running 0 4m38s 10.244.1.20 K8s-Worker-1 <none> <none>
kube-system coredns-66bff467f8-2q4z9 1/1 Running 1 4d14h 10.244.0.5 K8s-Master <none> <none>
kube-system coredns-66bff467f8-ktbd4 1/1 Running 1 4d14h 10.244.0.4 K8s-Master <none> <none>
kube-system etcd-K8s-Master 1/1 Running 1 4d14h 65.66.67.5 K8s-Master <none> <none>
kube-system kube-apiserver-K8s-Master 1/1 Running 1 4d14h 65.66.67.5 K8s-Master <none> <none>
kube-system kube-controller-manager-K8s-Master 1/1 Running 1 4d14h 65.66.67.5 K8s-Master <none> <none>
kube-system kube-flannel-ds-amd64-d6h9c 1/1 Running 61 45h 65.66.67.6 K8s-Worker-1 <none> <none>
kube-system kube-flannel-ds-amd64-tc4qf 1/1 Running 202 4d14h 65.66.67.5 K8s-Master <none> <none>
kube-system kube-proxy-cl9n4 1/1 Running 0 45h 65.66.67.6 K8s-Worker-1 <none> <none>
kube-system kube-proxy-s7jlc 1/1 Running 1 4d14h 65.66.67.5 K8s-Master <none> <none>
kube-system kube-scheduler-K8s-Master 1/1 Running 1 4d14h 65.66.67.5 K8s-Master <none> <none>

# kubectl get pods
NAME READY STATUS RESTARTS AGE
dnsutils 1/1 Running 0 22m

目前在 Kubernetes 集群主节点和 nslookup kubernetes.default 上执行的以下命令失败。

# kubectl exec -i -t dnsutils -- nslookup kubernetes.default
;; connection timed out; no servers could be reached

command terminated with exit code 1


# kubectl exec -ti dnsutils -- cat /etc/resolv.conf
nameserver 10.96.0.10
search default.svc.cluster.local svc.cluster.local cluster.local company.domain.com
options ndots:5


# kubectl get pods --namespace=kube-system -l k8s-app=kube-dns
NAME READY STATUS RESTARTS AGE
coredns-66bff467f8-2q4z9 1/1 Running 1 4d14h
coredns-66bff467f8-ktbd4 1/1 Running 1 4d14h

# kubectl logs --namespace=kube-system -l k8s-app=kube-dns
.:53
[INFO] plugin/reload: Running configuration MD5 = 4e235fcc3696966e76816bcd9034ebc7
CoreDNS-1.6.7
linux/amd64, go1.13.6, da7f65b
.:53
[INFO] plugin/reload: Running configuration MD5 = 4e235fcc3696966e76816bcd9034ebc7
CoreDNS-1.6.7
linux/amd64, go1.13.6, da7f65b


# kubectl get svc --namespace=kube-system
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kube-dns ClusterIP 10.96.0.10 <none> 53/UDP,53/TCP,9153/TCP 4d14h

# kubectl get endpoints kube-dns --namespace=kube-system
NAME ENDPOINTS AGE
kube-dns 10.244.0.4:53,10.244.0.5:53,10.244.0.4:9153 + 3 more... 4d14h


# kubectl describe svc -n kube-system kube-dns
Name: kube-dns
Namespace: kube-system
Labels: k8s-app=kube-dns
kubernetes.io/cluster-service=true
kubernetes.io/name=KubeDNS
Annotations: prometheus.io/port: 9153
prometheus.io/scrape: true
Selector: k8s-app=kube-dns
Type: ClusterIP
IP: 10.96.0.10
Port: dns 53/UDP
TargetPort: 53/UDP
Endpoints: 10.244.0.4:53,10.244.0.5:53
Port: dns-tcp 53/TCP
TargetPort: 53/TCP
Endpoints: 10.244.0.4:53,10.244.0.5:53
Port: metrics 9153/TCP
TargetPort: 9153/TCP
Endpoints: 10.244.0.4:9153,10.244.0.5:9153
Session Affinity: None
Events: <none>

# kubectl describe svc kubernetes
Name: kubernetes
Namespace: default
Labels: component=apiserver
provider=kubernetes
Annotations: <none>
Selector: <none>
Type: ClusterIP
IP: 10.96.0.1
Port: https 443/TCP
TargetPort: 6443/TCP
Endpoints: 65.66.67.5:6443
Session Affinity: None
Events: <none>

任何人都可以帮我调试这个问题。谢谢。

最佳答案

我已经卸载并重新安装了 Kubernetes 版本 - v1.19.0 现在一切正常。谢谢。

关于Kubernetes nslookup kubernetes.default 失败,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/63653289/

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