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Kube-dns Intermittent CrashLoopBackOff #947

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keithharvey opened this issue Dec 23, 2016 · 2 comments
Closed

Kube-dns Intermittent CrashLoopBackOff #947

keithharvey opened this issue Dec 23, 2016 · 2 comments
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@keithharvey
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keithharvey commented Dec 23, 2016 •
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Is this a BUG REPORT or FEATURE REQUEST? (choose one): Bug Report

Minikube version (use minikube version): v0.14.0

Environment:

  • OS (e.g. from /etc/os-release): OSX 10.11.6 (15G1212)
  • VM Driver (e.g. cat ~/.minikube/machines/minikube/config.json | grep DriverName): xhyve
  • Docker version (e.g. docker -v): 1.12.5, build 7392c3b

What happened:
After initially working, kube-dns will get into a crash loop. Restarting minikube fixes it

working:

Name:			kube-dns
Namespace:		kube-system
Labels:			k8s-app=kube-dns
			kubernetes.io/cluster-service=true
			kubernetes.io/name=KubeDNS
Selector:		k8s-app=kube-dns
Type:			ClusterIP
IP:			10.0.0.10
Port:			dns	53/UDP
Endpoints:		172.17.0.4:53
Port:			dns-tcp	53/TCP
Endpoints:		172.17.0.4:53
Session Affinity:	None
No events.
...

Not working (no endpoint):

Name:			kube-dns
Namespace:		kube-system
Labels:			k8s-app=kube-dns
			kubernetes.io/cluster-service=true
			kubernetes.io/name=KubeDNS
Selector:		k8s-app=kube-dns
Type:			ClusterIP
IP:			10.0.0.10
Port:			dns	53/UDP
Endpoints:		
Port:			dns-tcp	53/TCP
Endpoints:		
Session Affinity:	None
No events.
....

$ kubectl get pods --namespace=kube-system
NAME                          READY     STATUS    RESTARTS   AGE
kube-addon-manager-minikube   1/1       Running   11         3d
kube-dns-v20-12vcw            2/3       Running   154        3d
kubernetes-dashboard-8rh3b    1/1       Running   76         3d

kubectl describe pod kube-dns-v20-12vcw -n kube-system

Name:		kube-dns-v20-12vcw
Namespace:	kube-system
Node:		minikube/192.168.64.2
Start Time:	Mon, 19 Dec 2016 15:40:00 -0700
Labels:		k8s-app=kube-dns
		version=v20
Status:		Running
IP:		172.17.0.2
Controllers:	ReplicationController/kube-dns-v20
Containers:
  kubedns:
    Container ID:	docker://9438c708fcb82a2c6fd7592a73c31e5eeb2051be0c42c47b3df66841339eca3a
    Image:		gcr.io/google_containers/kubedns-amd64:1.8
    Image ID:		docker://sha256:597a45ef55ec52401fdcd2e1d6ee53c74b04afb264490d7fa67b6d98ad330dfe
    Ports:		10053/UDP, 10053/TCP
    Args:
      --domain=cluster.local.
      --dns-port=10053
    Limits:
      memory:	170Mi
    Requests:
      cpu:		100m
      memory:		70Mi
    State:		Waiting
      Reason:		CrashLoopBackOff
    Last State:		Terminated
      Reason:		Error
      Exit Code:	2
      Started:		Thu, 22 Dec 2016 16:07:55 -0700
      Finished:		Thu, 22 Dec 2016 16:09:03 -0700
    Ready:		False
    Restart Count:	74
    Liveness:		http-get http://:8080/healthz-kubedns delay=60s timeout=5s period=10s #success=1 #failure=5
    Readiness:		http-get http://:8081/readiness delay=3s timeout=5s period=10s #success=1 #failure=3
    Volume Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-9lns9 (ro)
    Environment Variables:	<none>
  dnsmasq:
    Container ID:	docker://f88502ee8468735530d5a9257f3a514f0533278ee469686c83f16f6a201e5815
    Image:		gcr.io/google_containers/kube-dnsmasq-amd64:1.4
    Image ID:		docker://sha256:3ec65756a89b70b4095e43a340a6e2d5696cac7a93a29619ff5c4b6be9af2773
    Ports:		53/UDP, 53/TCP
    Args:
      --cache-size=1000
      --no-resolv
      --server=127.0.0.1#10053
      --log-facility=-
    State:		Running
      Started:		Thu, 22 Dec 2016 16:10:40 -0700
    Last State:		Terminated
      Reason:		Error
      Exit Code:	137
      Started:		Thu, 22 Dec 2016 16:06:18 -0700
      Finished:		Thu, 22 Dec 2016 16:07:53 -0700
    Ready:		True
    Restart Count:	71
    Liveness:		http-get http://:8080/healthz-dnsmasq delay=60s timeout=5s period=10s #success=1 #failure=5
    Volume Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-9lns9 (ro)
    Environment Variables:	<none>
  healthz:
    Container ID:	docker://f83814f0d347d728570b1e4431c4a453cee74a61056d2978b1a4ed2689012334
    Image:		gcr.io/google_containers/exechealthz-amd64:1.2
    Image ID:		docker://sha256:93a43bfb39bfe9795e76ccd75d7a0e6d40e2ae8563456a2a77c1b4cfc3bbd967
    Port:		8080/TCP
    Args:
      --cmd=nslookup kubernetes.default.svc.cluster.local 127.0.0.1 >/dev/null
      --url=/healthz-dnsmasq
      --cmd=nslookup kubernetes.default.svc.cluster.local 127.0.0.1:10053 >/dev/null
      --url=/healthz-kubedns
      --port=8080
      --quiet
    Limits:
      memory:	50Mi
    Requests:
      cpu:		10m
      memory:		50Mi
    State:		Running
      Started:		Thu, 22 Dec 2016 15:45:00 -0700
    Last State:		Terminated
      Reason:		Error
      Exit Code:	2
      Started:		Thu, 22 Dec 2016 15:39:27 -0700
      Finished:		Thu, 22 Dec 2016 15:43:37 -0700
    Ready:		True
    Restart Count:	11
    Volume Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-9lns9 (ro)
    Environment Variables:	<none>
Conditions:
  Type		Status
  Initialized 	True 
  Ready 	False 
  PodScheduled 	True 
Volumes:
  default-token-9lns9:
    Type:	Secret (a volume populated by a Secret)
    SecretName:	default-token-9lns9
QoS Class:	Burstable
Tolerations:	CriticalAddonsOnly=:Exists
Events:
  FirstSeen	LastSeen	Count	From			SubobjectPath			Type		Reason		Message
  ---------	--------	-----	----			-------------			--------	------		-------
  5h		59m		11	{kubelet minikube}	spec.containers{kubedns}	Normal		Pulled		Container image "gcr.io/google_containers/kubedns-amd64:1.8" already present on machine
  1h		59m		33	{kubelet minikube}	spec.containers{kubedns}	Warning		Unhealthy	Readiness probe failed: Get http://172.17.0.3:8081/readiness: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
  1h		59m		29	{kubelet minikube}					Warning		FailedSync	Error syncing pod, skipping: failed to "StartContainer" for "dnsmasq" with CrashLoopBackOff: "Back-off 5m0s restarting failed container=dnsmasq pod=kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)"

  1h	58m	60	{kubelet minikube}	spec.containers{kubedns}	Warning	Unhealthy	Readiness probe failed: Get http://172.17.0.3:8081/readiness: dial tcp 172.17.0.3:8081: getsockopt: connection refused
  1h	58m	20	{kubelet minikube}	spec.containers{kubedns}	Warning	Unhealthy	Liveness probe failed: Get http://172.17.0.3:8080/healthz-kubedns: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
  5h	57m	11	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Pulled		Container image "gcr.io/google_containers/kube-dnsmasq-amd64:1.4" already present on machine
  1h	57m	11	{kubelet minikube}	spec.containers{kubedns}	Normal	Created		(events with common reason combined)
  1h	57m	11	{kubelet minikube}	spec.containers{kubedns}	Normal	Started		(events with common reason combined)
  1h	56m	32	{kubelet minikube}					Warning	FailedSync	Error syncing pod, skipping: failed to "StartContainer" for "kubedns" with CrashLoopBackOff: "Back-off 5m0s restarting failed container=kubedns pod=kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)"

  1h	56m	14	{kubelet minikube}	spec.containers{dnsmasq}	Warning	Unhealthy	Liveness probe failed: Get http://172.17.0.3:8080/healthz-dnsmasq: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
  1h	55m	13	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Killing		(events with common reason combined)
  1h	55m	6	{kubelet minikube}					Warning	FailedSync	Error syncing pod, skipping: [failed to "StartContainer" for "dnsmasq" with CrashLoopBackOff: "Back-off 5m0s restarting failed container=dnsmasq pod=kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)"
, failed to "StartContainer" for "kubedns" with CrashLoopBackOff: "Back-off 5m0s restarting failed container=kubedns pod=kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)"
]
  1h	54m	27	{kubelet minikube}		Warning	FailedSync	Error syncing pod, skipping: [failed to "StartContainer" for "kubedns" with CrashLoopBackOff: "Back-off 5m0s restarting failed container=kubedns pod=kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)"
, failed to "StartContainer" for "dnsmasq" with CrashLoopBackOff: "Back-off 5m0s restarting failed container=dnsmasq pod=kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)"
]
  1h	54m	154	{kubelet minikube}	spec.containers{kubedns}	Warning	BackOff		Back-off restarting failed docker container
  54m	54m	1	{kubelet minikube}					Warning	FailedSync	Error syncing pod, skipping: failed to "StartContainer" for "POD" with ImageInspectError: "Failed to inspect image \"gcr.io/google_containers/pause-amd64:3.0\": Cannot connect to the Docker daemon. Is the docker daemon running on this host?"

  53m	53m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Pulled		Container image "gcr.io/google_containers/kubedns-amd64:1.8" already present on machine
  53m	53m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Created		Created container with docker id f377e01484d0; Security:[seccomp=unconfined]
  53m	53m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Started		Started container with docker id f377e01484d0
  53m	53m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Pulled		Container image "gcr.io/google_containers/kube-dnsmasq-amd64:1.4" already present on machine
  53m	53m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Created		Created container with docker id bf5c9f9a093e; Security:[seccomp=unconfined]
  53m	53m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Started		Started container with docker id bf5c9f9a093e
  53m	53m	1	{kubelet minikube}	spec.containers{healthz}	Normal	Pulled		Container image "gcr.io/google_containers/exechealthz-amd64:1.2" already present on machine
  53m	53m	1	{kubelet minikube}	spec.containers{healthz}	Normal	Created		Created container with docker id ceb03132c329; Security:[seccomp=unconfined]
  53m	53m	1	{kubelet minikube}	spec.containers{healthz}	Normal	Started		Started container with docker id ceb03132c329
  34m	34m	1	{kubelet minikube}	spec.containers{dnsmasq}	Warning	Unhealthy	Liveness probe failed: Get http://172.17.0.4:8080/healthz-dnsmasq: dial tcp 172.17.0.4:8080: getsockopt: connection refused
  34m	34m	1	{kubelet minikube}	spec.containers{kubedns}	Warning	Unhealthy	Liveness probe failed: Get http://172.17.0.4:8080/healthz-kubedns: dial tcp 172.17.0.4:8080: getsockopt: connection refused
  32m	32m	1	{kubelet minikube}	spec.containers{healthz}	Normal	Pulled		Container image "gcr.io/google_containers/exechealthz-amd64:1.2" already present on machine
  32m	32m	1	{kubelet minikube}	spec.containers{healthz}	Normal	Created		Created container with docker id 7e921f54a3d4; Security:[seccomp=unconfined]
  32m	32m	1	{kubelet minikube}	spec.containers{healthz}	Normal	Started		Started container with docker id 7e921f54a3d4
  32m	32m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Pulled		Container image "gcr.io/google_containers/kubedns-amd64:1.8" already present on machine
  32m	32m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Created		Created container with docker id 220b02f83a86; Security:[seccomp=unconfined]
  32m	32m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Started		Started container with docker id 220b02f83a86
  32m	32m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Pulled		Container image "gcr.io/google_containers/kube-dnsmasq-amd64:1.4" already present on machine
  32m	32m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Created		Created container with docker id 829e48ed741f; Security:[seccomp=unconfined]
  32m	32m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Started		Started container with docker id 829e48ed741f
  27m	27m	1	{kubelet minikube}	spec.containers{dnsmasq}	Warning	Unhealthy	Liveness probe failed: Get http://172.17.0.4:8080/healthz-dnsmasq: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
  27m	27m	1	{kubelet minikube}	spec.containers{kubedns}	Warning	Unhealthy	Readiness probe failed: Get http://172.17.0.4:8081/readiness: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
  27m	27m	1	{kubelet minikube}	spec.containers{kubedns}	Warning	Unhealthy	Liveness probe failed: Get http://172.17.0.4:8080/healthz-kubedns: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
  26m	26m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Created		Created container with docker id 68b8e30f5c5b; Security:[seccomp=unconfined]
  26m	26m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Started		Started container with docker id 68b8e30f5c5b
  26m	26m	1	{kubelet minikube}	spec.containers{healthz}	Normal	Pulled		Container image "gcr.io/google_containers/exechealthz-amd64:1.2" already present on machine
  26m	26m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Started		Started container with docker id 9c24df251517
  26m	26m	1	{kubelet minikube}	spec.containers{healthz}	Normal	Created		Created container with docker id f83814f0d347; Security:[seccomp=unconfined]
  26m	26m	1	{kubelet minikube}	spec.containers{healthz}	Normal	Started		Started container with docker id f83814f0d347
  26m	26m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Created		Created container with docker id 9c24df251517; Security:[seccomp=unconfined]
  13m	13m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Killing		Killing container with docker id 9c24df251517: pod "kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)" container "kubedns" is unhealthy, it will be killed and re-created.
  12m	12m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Killing		Killing container with docker id 68b8e30f5c5b: pod "kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)" container "dnsmasq" is unhealthy, it will be killed and re-created.
  12m	12m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Started		Started container with docker id 1accbd7f15ac
  12m	12m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Created		Created container with docker id 1accbd7f15ac; Security:[seccomp=unconfined]
  12m	12m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Created		Created container with docker id 56d5f499beb4; Security:[seccomp=unconfined]
  12m	12m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Started		Started container with docker id 56d5f499beb4
  11m	11m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Killing		Killing container with docker id 56d5f499beb4: pod "kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)" container "dnsmasq" is unhealthy, it will be killed and re-created.
  15m	10m	25	{kubelet minikube}	spec.containers{kubedns}	Warning	Unhealthy	Readiness probe failed: Get http://172.17.0.2:8081/readiness: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
  10m	10m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Killing		Killing container with docker id 1accbd7f15ac: pod "kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)" container "kubedns" is unhealthy, it will be killed and re-created.
  10m	10m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Created		Created container with docker id 059e947de588; Security:[seccomp=unconfined]
  10m	10m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Started		Started container with docker id 059e947de588
  10m	10m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Created		Created container with docker id fa4d04b5b9ab; Security:[seccomp=unconfined]
  10m	10m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Started		Started container with docker id fa4d04b5b9ab
  9m	9m	1	{kubelet minikube}	spec.containers{kubedns}	Warning	Unhealthy	Liveness probe failed: HTTP probe failed with statuscode: 503
  9m	9m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Killing		Killing container with docker id 059e947de588: pod "kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)" container "kubedns" is unhealthy, it will be killed and re-created.
  9m	9m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Created		Created container with docker id 0a1c624cd8f1; Security:[seccomp=unconfined]
  9m	9m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Started		Started container with docker id 0a1c624cd8f1
  8m	8m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Killing		Killing container with docker id fa4d04b5b9ab: pod "kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)" container "dnsmasq" is unhealthy, it will be killed and re-created.
  8m	8m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Created		Created container with docker id a65eeb3248f6; Security:[seccomp=unconfined]
  8m	8m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Started		Started container with docker id a65eeb3248f6
  8m	8m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Killing		Killing container with docker id 0a1c624cd8f1: pod "kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)" container "kubedns" is unhealthy, it will be killed and re-created.
  8m	8m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Created		Created container with docker id 297f52d1550a; Security:[seccomp=unconfined]
  8m	8m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Started		Started container with docker id 297f52d1550a
  7m	7m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Killing		Killing container with docker id a65eeb3248f6: pod "kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)" container "dnsmasq" is unhealthy, it will be killed and re-created.
  7m	7m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Created		Created container with docker id cc17cc010ba9; Security:[seccomp=unconfined]
  7m	7m	1	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Started		Started container with docker id cc17cc010ba9
  6m	6m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Killing		Killing container with docker id 297f52d1550a: pod "kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)" container "kubedns" is unhealthy, it will be killed and re-created.
  6m	6m	8	{kubelet minikube}					Warning	FailedSync	Error syncing pod, skipping: failed to "StartContainer" for "kubedns" with CrashLoopBackOff: "Back-off 1m20s restarting failed container=kubedns pod=kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)"

  5m	5m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Created		Created container with docker id 63443adcc35c; Security:[seccomp=unconfined]
  5m	5m	1	{kubelet minikube}	spec.containers{kubedns}	Normal	Started		Started container with docker id 63443adcc35c
  15m	4m	15	{kubelet minikube}	spec.containers{dnsmasq}	Warning	Unhealthy	Liveness probe failed: Get http://172.17.0.2:8080/healthz-dnsmasq: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
  26m	3m	7	{kubelet minikube}	spec.containers{kubedns}	Normal	Pulled		Container image "gcr.io/google_containers/kubedns-amd64:1.8" already present on machine
  3m	2m	8	{kubelet minikube}					Warning	FailedSync	Error syncing pod, skipping: failed to "StartContainer" for "dnsmasq" with CrashLoopBackOff: "Back-off 2m40s restarting failed container=dnsmasq pod=kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)"

  12m	2m	38	{kubelet minikube}	spec.containers{kubedns}	Warning	Unhealthy	Readiness probe failed: Get http://172.17.0.2:8081/readiness: dial tcp 172.17.0.2:8081: getsockopt: connection refused
  15m	2m	15	{kubelet minikube}	spec.containers{kubedns}	Warning	Unhealthy	Liveness probe failed: Get http://172.17.0.2:8080/healthz-kubedns: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
  5m	2m	4	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Killing		(events with common reason combined)
  2m	1m	5	{kubelet minikube}					Warning	FailedSync	Error syncing pod, skipping: [failed to "StartContainer" for "kubedns" with CrashLoopBackOff: "Back-off 5m0s restarting failed container=kubedns pod=kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)"
, failed to "StartContainer" for "dnsmasq" with CrashLoopBackOff: "Back-off 2m40s restarting failed container=dnsmasq pod=kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)"
]
  2m	1m	4	{kubelet minikube}		Warning	FailedSync	Error syncing pod, skipping: [failed to "StartContainer" for "dnsmasq" with CrashLoopBackOff: "Back-off 2m40s restarting failed container=dnsmasq pod=kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)"
, failed to "StartContainer" for "kubedns" with CrashLoopBackOff: "Back-off 5m0s restarting failed container=kubedns pod=kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)"
]
  26m	1m	7	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Pulled		Container image "gcr.io/google_containers/kube-dnsmasq-amd64:1.4" already present on machine
  5m	1m	3	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Created		(events with common reason combined)
  5m	58s	3	{kubelet minikube}	spec.containers{dnsmasq}	Normal	Started		(events with common reason combined)
  6m	1s	40	{kubelet minikube}	spec.containers{kubedns}	Warning	BackOff		Back-off restarting failed docker container
  58s	1s	6	{kubelet minikube}					Warning	FailedSync	Error syncing pod, skipping: failed to "StartContainer" for "kubedns" with CrashLoopBackOff: "Back-off 5m0s restarting failed container=kubedns pod=kube-dns-v20-12vcw_kube-system(133f0581-c63c-11e6-83a1-ce231054886b)"

~/code/rj (master) $ kubectl logs kube-dns-v20-12vcw -n kube-system -c kubedns
~/code/rj (master) $ kubectl logs kube-dns-v20-12vcw -n kube-system -c dnsmasq
dnsmasq[1]: started, version 2.76 cachesize 1000
dnsmasq[1]: compile time options: IPv6 GNU-getopt no-DBus no-i18n no-IDN DHCP DHCPv6 no-Lua TFTP no-conntrack ipset auth no-DNSSEC loop-detect inotify
dnsmasq[1]: using nameserver 127.0.0.1#10053
dnsmasq[1]: read /etc/hosts - 7 addresses
~/code/rj (master) $ kubectl logs kube-dns-v20-12vcw -n kube-system -c healthz
2016/12/22 22:56:55 Latest result too old to be useful: Result of last exec: , at 2016-12-22 22:56:21.706891488 +0000 UTC, error None.
2016/12/22 22:56:55 Latest result too old to be useful: Result of last exec: , at 2016-12-22 22:56:21.706891488 +0000 UTC, error None.
2016/12/22 22:56:55 Latest result too old to be useful: Result of last exec: , at 2016-12-22 22:56:21.706891488 +0000 UTC, error None.
2016/12/22 22:58:23 Latest result too old to be useful: Result of last exec: , at 2016-12-22 22:57:03.000902982 +0000 UTC, error None.
2016/12/22 22:58:23 Latest result too old to be useful: Result of last exec: , at 2016-12-22 22:57:03.000902982 +0000 UTC, error None.
2016/12/22 22:58:23 Latest result too old to be useful: Result of last exec: , at 2016-12-22 22:57:31.304386027 +0000 UTC, error None.
2016/12/22 22:58:23 Latest result too old to be useful: Result of last exec: , at 2016-12-22 22:57:31.304386027 +0000 UTC, error None.
2016/12/22 22:58:23 Latest result too old to be useful: Result of last exec: , at 2016-12-22 22:57:03.000902982 +0000 UTC, error None.
2016/12/22 22:58:23 Latest result too old to be useful: Result of last exec: , at 2016-12-22 22:57:03.000902982 +0000 UTC, error None.
2016/12/22 22:58:23 Latest result too old to be useful: Result of last exec: , at 2016-12-22 22:57:03.000902982 +0000 UTC, error None.
2016/12/22 22:58:23 Latest result too old to be useful: Result of last exec: , at 2016-12-22 22:57:31.304386027 +0000 UTC, error None.
2016/12/22 22:58:23 Latest result too old to be useful: Result of last exec: , at 2016-12-22 22:57:31.304386027 +0000 UTC, error None.
2016/12/22 22:58:23 Latest result too old to be useful: Result of last exec: , at 2016-12-22 22:57:31.304386027 +0000 UTC, error None.
2016/12/22 23:00:09 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:00:01.088061926 +0000 UTC, error exit status 1
2016/12/22 23:00:09 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:00:02.652894452 +0000 UTC, error exit status 1
2016/12/22 23:02:08 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:02:06.928783487 +0000 UTC, error exit status 1
2016/12/22 23:02:42 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:02:04.557499748 +0000 UTC, error exit status 1
2016/12/22 23:03:19 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:03:18.960432027 +0000 UTC, error exit status 1
2016/12/22 23:06:00 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:03:49.774130823 +0000 UTC, error exit status 1
2016/12/22 23:06:01 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:05:59.406481194 +0000 UTC, error exit status 1
2016/12/22 23:06:03 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:03:49.774130823 +0000 UTC, error exit status 1
2016/12/22 23:10:03 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:07:46.728427536 +0000 UTC, error exit status 1
2016/12/22 23:10:18 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:08:00.858504849 +0000 UTC, error exit status 1
2016/12/22 23:11:18 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:09:34.718138037 +0000 UTC, error exit status 1
2016/12/22 23:11:56 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:10:50.598608832 +0000 UTC, error exit status 1
2016/12/22 23:17:46 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:15:36.258315381 +0000 UTC, error exit status 1
2016/12/22 23:18:01 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:17:27.538748923 +0000 UTC, error exit status 1
2016/12/22 23:19:42 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:18:25.238372493 +0000 UTC, error exit status 1
2016/12/22 23:20:34 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:20:28.096994817 +0000 UTC, error exit status 1
2016/12/22 23:25:15 Latest result too old to be useful: Result of last exec: , at 2016-12-22 23:23:52.411261964 +0000 UTC, error None.
2016/12/22 23:25:15 Latest result too old to be useful: Result of last exec: , at 2016-12-22 23:23:52.411261964 +0000 UTC, error None.
2016/12/22 23:25:15 Latest result too old to be useful: Result of last exec: , at 2016-12-22 23:23:52.411261964 +0000 UTC, error None.
2016/12/22 23:25:15 Latest result too old to be useful: Result of last exec: , at 2016-12-22 23:23:52.411261964 +0000 UTC, error None.
2016/12/22 23:25:15 Latest result too old to be useful: Result of last exec: , at 2016-12-22 23:23:52.411261964 +0000 UTC, error None.
2016/12/22 23:31:30 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:31:30.031569257 +0000 UTC, error exit status 1
2016/12/22 23:31:30 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:31:30.031569257 +0000 UTC, error exit status 1
2016/12/22 23:31:30 Latest result too old to be useful: Result of last exec: , at 2016-12-22 23:29:55.396372647 +0000 UTC, error None.
2016/12/22 23:31:30 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:31:30.031569257 +0000 UTC, error exit status 1
2016/12/22 23:31:30 Latest result too old to be useful: Result of last exec: , at 2016-12-22 23:29:55.396372647 +0000 UTC, error None.
2016/12/22 23:31:30 Latest result too old to be useful: Result of last exec: , at 2016-12-22 23:29:55.396372647 +0000 UTC, error None.
2016/12/22 23:31:30 Latest result too old to be useful: Result of last exec: , at 2016-12-22 23:29:55.396372647 +0000 UTC, error None.
2016/12/22 23:31:30 Latest result too old to be useful: Result of last exec: , at 2016-12-22 23:29:54.687293921 +0000 UTC, error None.
2016/12/22 23:31:30 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:31:30.031569257 +0000 UTC, error exit status 1
2016/12/22 23:31:30 Latest result too old to be useful: Result of last exec: , at 2016-12-22 23:29:55.396372647 +0000 UTC, error None.
2016/12/22 23:35:18 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:35:06.5822531 +0000 UTC, error exit status 1
2016/12/22 23:35:18 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:35:06.5822531 +0000 UTC, error exit status 1
2016/12/22 23:35:18 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:34:19.252762761 +0000 UTC, error exit status 1
2016/12/22 23:35:18 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:34:19.252762761 +0000 UTC, error exit status 1
2016/12/22 23:35:18 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:34:19.252762761 +0000 UTC, error exit status 1
2016/12/22 23:35:18 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:35:06.5822531 +0000 UTC, error exit status 1
2016/12/22 23:35:18 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:34:19.252762761 +0000 UTC, error exit status 1
2016/12/22 23:35:18 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:35:06.5822531 +0000 UTC, error exit status 1
2016/12/22 23:41:45 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:41:21.375881143 +0000 UTC, error exit status 1
2016/12/22 23:41:45 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:41:24.491262797 +0000 UTC, error exit status 1
2016/12/22 23:42:49 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:42:42.4129767 +0000 UTC, error exit status 1
2016/12/22 23:43:33 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:43:21.715618171 +0000 UTC, error exit status 1
2016/12/22 23:50:13 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:50:07.207462063 +0000 UTC, error exit status 1
2016/12/22 23:50:14 Latest result too old to be useful: Result of last exec: , at 2016-12-22 23:49:23.943983715 +0000 UTC, error None.
2016/12/22 23:51:39 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:51:28.496814294 +0000 UTC, error exit status 1
2016/12/22 23:51:59 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:50:33.646504986 +0000 UTC, error exit status 1
2016/12/22 23:58:23 Latest result too old to be useful: Result of last exec: , at 2016-12-22 23:57:53.142920737 +0000 UTC, error None.
2016/12/22 23:58:23 Latest result too old to be useful: Result of last exec: , at 2016-12-22 23:57:53.142920737 +0000 UTC, error None.
2016/12/22 23:58:23 Latest result too old to be useful: Result of last exec: , at 2016-12-22 23:57:53.142920737 +0000 UTC, error None.
2016/12/22 23:59:14 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:58:33.136525764 +0000 UTC, error exit status 1
2016/12/22 23:59:14 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:59:14.071287464 +0000 UTC, error exit status 1
2016/12/22 23:59:14 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-22 23:59:14.071287464 +0000 UTC, error exit status 1
2016/12/23 00:01:59 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-23 00:01:34.170876544 +0000 UTC, error exit status 1
2016/12/23 00:02:00 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-23 00:01:57.631239647 +0000 UTC, error exit status 1
2016/12/23 00:10:05 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-23 00:08:38.920605539 +0000 UTC, error exit status 1
2016/12/23 00:10:05 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-23 00:08:34.835785246 +0000 UTC, error exit status 1
2016/12/23 00:10:07 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-23 00:10:05.738244378 +0000 UTC, error exit status 1
2016/12/23 00:10:07 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-23 00:10:05.630155978 +0000 UTC, error exit status 1
2016/12/23 00:17:14 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-23 00:16:27.609570957 +0000 UTC, error exit status 1
2016/12/23 00:17:14 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-23 00:17:10.312535772 +0000 UTC, error exit status 1
2016/12/23 00:19:05 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-23 00:18:27.379915937 +0000 UTC, error exit status 1
2016/12/23 00:19:07 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-23 00:18:13.569750542 +0000 UTC, error exit status 1
2016/12/23 00:26:15 Latest result too old to be useful: Result of last exec: , at 2016-12-23 00:25:10.874673104 +0000 UTC, error None.
2016/12/23 00:26:32 Healthz probe on /healthz-kubedns error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-23 00:26:32.234659445 +0000 UTC, error exit status 1
2016/12/23 00:27:08 Healthz probe on /healthz-dnsmasq error: Result of last exec: nslookup: can't resolve 'kubernetes.default.svc.cluster.local'
, at 2016-12-23 00:27:02.875679955 +0000 UTC, error exit status 1

The kube-dns pod just keeps failing forever and the dns will not come back up until you restart minikube

How to reproduce it:

Honestly I'm unsure. A few things about my setup:

  • kubectl port-forward into an nginx load-balancer which uses the request path to proxy pass to the appropriate service. Had some problems with nginx using the kubernetes dns server so had to use dnsmasq in the load-balancer pod. This works fine on GCE but is a little gross so figured it was worth mentioning
  • using NFS to mount 2 volumes from the host as described here

The described behavior happens consistently and quickly (~30-60 seconds after being fixed)

Possibly related: #314
@r2d4 r2d4 added the kind/bug Categorizes issue or PR as related to a bug. label Dec 23, 2016
@dlorenc dlorenc mentioned this issue Jan 5, 2017
Closed
@david-mohr
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I had a very similar problem (Linux, virtualbox, docker 1.21.1) and it turned out that the minikube virtual machine had somehow lost it's connection on the NAT interface which was causing DNS to break. This also meant that minikube ssh failed to connect to the VM.

The workaround was to connect directly to the VM (double click the VM in virtualbox), kill udhcpc for eth0 and then request a new address with udhcpc -i eth0. Once resolved, I restarted the kube-dns pod and everything started working once more.

@keithharvey
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keithharvey commented Jan 10, 2017 •
edited
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Works on master.

@mellotron mellotron mentioned this issue Jan 15, 2017
Closed
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