我在3個REHEL7服務器上安裝了kubernetes 1.2.4(沒有互聯網訪問,所有內容都被ansible推送)。在Pod中的SkyDNS MissingClusterDNS
編輯:見我就擁有了一切工作的偉大除外文檔中給出的KUBE-DNS例子問題
結束。我做了多次試驗,幾個configuraiton,重新創建整個豆莢......我總是有這樣的 「MissingClusterDNS」 錯誤:
enter code here20m 20m 2 {kubelet k8s-minion-1.XXXXXX} Warning MissingClusterDNS kubelet does not have ClusterDNS IP configured and cannot create Pod using "ClusterFirst" policy. Falling back to DNSDefault policy.
正如你所看到的,KUBE-DNS運行:
kubectl get svc kube-dns --namespace=kube-system
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kube-dns 172.16.0.99 <none> 53/UDP,53/TCP 15m
而kubelete已經得到了正確的選項
KUBELET_ARGS=" --cluster-dns=172.16.0.99 --cluster-domain=kubernetes.local "
證明:
ps ax | grep kubelet
6077 ? Ssl 0:07 /opt/kubernetes/bin/kubelet --logtostderr=true --v=0 --address=0.0.0.0 --port=10250 --hostname-override=k8s-minion-1.XXXXXX --api-servers=http://k8s-master.XXXXXX:8080 --allow-privileged=false --cluster-dns=172.16.0.99 --cluster-domain=kubernetes.local
但是,在DNS莢作爲未運行容器:
kubectl get pods --namespace=kube-system
NAME READY STATUS RESTARTS AGE
kube-dns-v11-f2f4a 3/4 CrashLoopBackOff 7 18m
和日誌是明確的:
Warning Unhealthy Readiness probe failed: Get http://172.16.23.2:8081/readiness: dial tcp 172.16.23.2:8081: connection refused
...
Warning FailedSync Error syncing pod, skipping: failed to "StartContainer" for "kube2sky" with CrashLoopBackOff: "Back-off 5m0s restarting failed container=kube2sky pod=kube-dns-v11-f2f4a_kube-system(27d70b7c-36f9-11e6-b4fe-fa163ee85c45)"
如果您需要了解更多信息:
$ kubectl get pods --namespace=kube-system
NAME READY STATUS RESTARTS AGE
kube-dns-v11-f2f4a 3/4 CrashLoopBackOff 7 18m
-------------------------
$ kubectl describe rc --namespace=kube-system
Name: kube-dns-v11
Namespace: kube-system
Image(s): our.registry/gcr.io/google_containers/etcd-amd64:2.2.1,our.registry/gcr.io/google_containers/kube2sky:1.14,our.registry/gcr.io/google_containers/skydns:2015-10-13-8c72f8c,our.registry/gcr.io/google_containers/exechealthz:1.0
Selector: k8s-app=kube-dns,version=v11
Labels: k8s-app=kube-dns,kubernetes.io/cluster-service=true,version=v11
Replicas: 1 current/1 desired
Pods Status: 1 Running/0 Waiting/0 Succeeded/0 Failed
Volumes:
etcd-storage:
Type: EmptyDir (a temporary directory that shares a pod's lifetime)
Medium:
Events:
FirstSeen LastSeen Count From SubobjectPath Type Reason Message
--------- -------- ----- ---- ------------- -------- ------ -------
19m 19m 1 {replication-controller } Normal SuccessfulCreate Created pod: kube-dns-v11-f2f4a
-------------------------------------------------------
$ kubectl get all --all-namespaces
NAMESPACE NAME DESIRED CURRENT AGE
kube-system kube-dns-v11 1 1 24m
NAMESPACE NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
default kubernetes 172.16.0.1 <none> 443/TCP 27m
kube-system kube-dns 172.16.0.99 <none> 53/UDP,53/TCP 24m
NAMESPACE NAME READY STATUS RESTARTS AGE
default busybox 1/1 Running 0 23m
kube-system kube-dns-v11-f2f4a 3/4 CrashLoopBackOff 9 24m
如果有人能幫我理解問題...
注意我正在使用https://github.com/kubernetes/kubernetes/tree/release-1.2/cluster/addons/dns RC和SVC在這裏我只改:
- clusterIp在我kubernetes一個有效的IP IP範圍
- 集羣域:kubernetes.local
- 羣集DNS:172.16.0.99
編輯: 3/4 kube-dns工作的問題來自證書。所以我可以確認SkyDNS現在正在工作。
NAME READY STATUS RESTARTS AGE
kube-dns-v11-c96d5 4/4 Running 0 9m
使用羣集API測試儀:
kubectl logs --tail=80 kube-dns-v11-c96d5 kube2sky --namespace=kube-system
I0621 13:27:52.070730 1 kube2sky.go:462] Etcd server found: http://127.0.0.1:4001
I0621 13:27:53.073614 1 kube2sky.go:529] Using https://192.168.0.1:443 for kubernetes master
I0621 13:27:53.073632 1 kube2sky.go:530] Using kubernetes API <nil>
I0621 13:27:53.074020 1 kube2sky.go:598] Waiting for service: default/kubernetes
I0621 13:27:53.166188 1 kube2sky.go:660] Successfully added DNS record for Kubernetes service.
但其他問題出現。
- 現在 「使用kubernetes API無」,而不是良好的版本
- 的BusyBox的例子從kubernetes文檔仍然不會RESOLV kubernetes.local
我會更多調查。但我解決了skydns的問題。謝謝
這就是今天早上我正在嘗試的。我試圖改變證書,ipv4配置等......在這個時候:錯誤命中主ip。就好像該吊艙無法聯繫api服務器。謝謝。 – Metal3d
我可以接受這個答案,因爲它提供了我獲取第一個問題的信息,即kube2sky問題。我需要在部分中使用IP創建證書。使用cluster-api-tester圖像我現在看到了正確的配置。但是,busybox示例目前不起作用......如果我真的找不到任何信息,我會在幾個小時內打開另一個主題 – Metal3d