Kubernetes Pod fails with CrashLoopBackOff
I 'm Following this guide in order to set up a pod using minikube and pull an image from a private repository hosted at: hub.docker.com
When trying to set up a pod to pull the image i see CrashLoopBackoff
pod config:
apiVersion: v1
kind: Pod
metadata:
name: private-reg
spec:
containers:
- name: private-reg-container
image: ha/prod:latest
imagePullSecrets:
- name: regsecret
output of "get pod"
kubectl get pod private-reg
NAME READY STATUS RESTARTS AGE
private-reg 0/1 CrashLoopBackOff 5 4m
As far as i can see there is no issue with the images and if i pull them manually and run them, they works.
(you can see Successfully pulled image "ha/prod:latest")
this issue also happens if i push a generic image to the repository such as centos and try to pull and run it using pod.
Also, the secret seems to work fine and i can see the "pulls" counted in the private repository.
Here is the output of the command:
kubectl describe pods private-reg:
[~]$ kubectl describe pods private-reg
Name: private-reg
Namespace: default
Node: minikube/192.168.99.100
Start Time: Thu, 22 Jun 2017 17:13:24 +0300
Labels: <none>
Annotations: <none>
Status: Running
IP: 172.17.0.5
Controllers: <none>
Containers:
private-reg-container:
Container ID: docker://1aad64750d0ba9ba826fe4f12c8814f7db77293078f8047feec686fcd8f90132
Image: ha/prod:latest
Image ID: docker://sha256:7335859e2071af518bcd0e2f373f57c1da643bb37c7e6bbc125d171ff98f71c0
Port:
State: Waiting
Reason: CrashLoopBackOff
Last State: Terminated
Reason: Completed
Exit Code: 0
Started: Mon, 01 Jan 0001 00:00:00 +0000
Finished: Thu, 22 Jun 2017 17:20:04 +0300
Ready: False
Restart Count: 6
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-bhvgz (ro)
Conditions:
Type Status
Initialized True
Ready False
PodScheduled True
Volumes:
default-token-bhvgz:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-bhvgz
Optional: false
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: <none>
Events:
FirstSeen LastSeen Count From SubObjectPath Type Reason Message
--------- -------- ----- ---- ------------- -------- ------ -------
9m 9m 1 default-scheduler Normal Scheduled Successfully assigned private-reg to minikube
8m 8m 1 kubelet, minikube spec.containers{private-reg-container} Normal Created Created container with id 431fecfd1d2ca03d29fd88fd6c663e66afb59dc5e86487409002dd8e9987945c
8m 8m 1 kubelet, minikube spec.containers{private-reg-container} Normal Started Started container with id 431fecfd1d2ca03d29fd88fd6c663e66afb59dc5e86487409002dd8e9987945c
8m 8m 1 kubelet, minikube spec.containers{private-reg-container} Normal Started Started container with id 223e6af99bb950570a27056d7401137ff9f3dc895f4f313a36e73ef6489eb61a
8m 8m 1 kubelet, minikube spec.containers{private-reg-container} Normal Created Created container with id 223e6af99bb950570a27056d7401137ff9f3dc895f4f313a36e73ef6489eb61a
8m 8m 2 kubelet, minikube Warning FailedSync Error syncing pod, skipping: failed to "StartContainer" for "private-reg-container" with CrashLoopBackOff: "Back-off 10s restarting failed container=private-reg-container pod=private-reg_default(f4340638-5754-11e7-978a-08002773375c)"
8m 8m 1 kubelet, minikube spec.containers{private-reg-container} Normal Started Started container with id a98377f9aedc5947fe1dd006caddb11fb48fa2fd0bb06c20667e0c8b83a3ab6a
8m 8m 1 kubelet, minikube spec.containers{private-reg-container} Normal Created Created container with id a98377f9aedc5947fe1dd006caddb11fb48fa2fd0bb06c20667e0c8b83a3ab6a
8m 8m 2 kubelet, minikube Warning FailedSync Error syncing pod, skipping: failed to "StartContainer" for "private-reg-container" with CrashLoopBackOff: "Back-off 20s restarting failed container=private-reg-container pod=private-reg_default(f4340638-5754-11e7-978a-08002773375c)"
8m 8m 1 kubelet, minikube spec.containers{private-reg-container} Normal Started Started container with id 261f430a80ff5a312bdbdee78558091a9ae7bc9fc6a9e0676207922f1a576841
8m 8m 1 kubelet, minikube spec.containers{private-reg-container} Normal Created Created container with id 261f430a80ff5a312bdbdee78558091a9ae7bc9fc6a9e0676207922f1a576841
8m 7m 3 kubelet, minikube Warning FailedSync Error syncing pod, skipping: failed to "StartContainer" for "private-reg-container" with CrashLoopBackOff: "Back-off 40s restarting failed container=private-reg-container pod=private-reg_default(f4340638-5754-11e7-978a-08002773375c)"
7m 7m 1 kubelet, minikube spec.containers{private-reg-container} Normal Created Created container with id 7251ab76853d4178eff59c10bb41e52b2b1939fbee26e546cd564e2f6b4a1478
7m 7m 1 kubelet, minikube spec.containers{private-reg-container} Normal Started Started container with id 7251ab76853d4178eff59c10bb41e52b2b1939fbee26e546cd564e2f6b4a1478
7m 5m 7 kubelet, minikube Warning FailedSync Error syncing pod, skipping: failed to "StartContainer" for "private-reg-container" with CrashLoopBackOff: "Back-off 1m20s restarting failed container=private-reg-container pod=private-reg_default(f4340638-5754-11e7-978a-08002773375c)"
5m 5m 1 kubelet, minikube spec.containers{private-reg-container} Normal Created Created container with id 347868d03fc9730417cf234e4c96195bb9b45a6cc9d9d97973855801d52e2a02
5m 5m 1 kubelet, minikube spec.containers{private-reg-container} Normal Started Started container with id 347868d03fc9730417cf234e4c96195bb9b45a6cc9d9d97973855801d52e2a02
5m 3m 12 kubelet, minikube Warning FailedSync Error syncing pod, skipping: failed to "StartContainer" for "private-reg-container" with CrashLoopBackOff: "Back-off 2m40s restarting failed container=private-reg-container pod=private-reg_default(f4340638-5754-11e7-978a-08002773375c)"
9m 2m 7 kubelet, minikube spec.containers{private-reg-container} Normal Pulling pulling image "ha/prod:latest"
2m 2m 1 kubelet, minikube spec.containers{private-reg-container} Normal Started Started container with id 1aad64750d0ba9ba826fe4f12c8814f7db77293078f8047feec686fcd8f90132
8m 2m 7 kubelet, minikube spec.containers{private-reg-container} Normal Pulled Successfully pulled image "ha/prod:latest"
2m 2m 1 kubelet, minikube spec.containers{private-reg-container} Normal Created Created container with id 1aad64750d0ba9ba826fe4f12c8814f7db77293078f8047feec686fcd8f90132
8m <invalid> 40 kubelet, minikube spec.containers{private-reg-container} Warning BackOff Back-off restarting failed container
2m <invalid> 14 kubelet, minikube Warning FailedSync Error syncing pod, skipping: failed to "StartContainer" for "private-reg-container" with CrashLoopBackOff: "Back-off 5m0s restarting failed container=private-reg-container pod=private-reg_default(f4340638-5754-11e7-978a-08002773375c)"
Here is the output of the command:
kubectl --v=8 logs private-reg:
I0622 17:35:01.043739 15981 cached_discovery.go:71] returning cached discovery info from /home/demo/.kube/cache/discovery/192.168.99.100_8443/apps/v1beta1/serverresources.json
I0622 17:35:01.043951 15981 cached_discovery.go:71] returning cached discovery info from /home/demo/.kube/cache/discovery/192.168.99.100_8443/v1/serverresources.json
I0622 17:35:01.045061 15981 cached_discovery.go:118] returning cached discovery info from /home/demo/.kube/cache/discovery/192.168.99.100_8443/servergroups.json
I0622 17:35:01.045175 15981 round_trippers.go:395] GET https://192.168.99.100:8443/api/v1/namespaces/default/pods/private-reg
I0622 17:35:01.045182 15981 round_trippers.go:402] Request Headers:
I0622 17:35:01.045187 15981 round_trippers.go:405] Accept: application/json, */*
I0622 17:35:01.045191 15981 round_trippers.go:405] User-Agent: kubectl/v1.6.6 (linux/amd64) kubernetes/7fa1c17
I0622 17:35:01.072863 15981 round_trippers.go:420] Response Status: 200 OK in 27 milliseconds
I0622 17:35:01.072900 15981 round_trippers.go:423] Response Headers:
I0622 17:35:01.072921 15981 round_trippers.go:426] Content-Type: application/json
I0622 17:35:01.072930 15981 round_trippers.go:426] Content-Length: 2216
I0622 17:35:01.072936 15981 round_trippers.go:426] Date: Thu, 22 Jun 2017 14:35:31 GMT
I0622 17:35:01.072994 15981 request.go:991] Response Body: {"kind":"Pod","apiVersion":"v1","metadata":{"name":"private-reg","namespace":"default","selfLink":"/api/v1/namespaces/default/pods/private-reg","uid":"f4340638-5754-11e7-978a-08002773375c","resourceVersion":"3070","creationTimestamp":"2017-06-22T14:13:24Z"},"spec":{"volumes":[{"name":"default-token-bhvgz","secret":{"secretName":"default-token-bhvgz","defaultMode":420}}],"containers":[{"name":"private-reg-container","image":"ha/prod:latest","resources":{},"volumeMounts":[{"name":"default-token-bhvgz","readOnly":true,"mountPath":"/var/run/secrets/kubernetes.io/serviceaccount"}],"terminationMessagePath":"/dev/termination-log","terminationMessagePolicy":"File","imagePullPolicy":"Always"}],"restartPolicy":"Always","terminationGracePeriodSeconds":30,"dnsPolicy":"ClusterFirst","serviceAccountName":"default","serviceAccount":"default","nodeName":"minikube","securityContext":{},"imagePullSecrets":[{"name":"regsecret"}],"schedulerName":"default-scheduler"},"status":{"phase":"Running","conditions":[{"type":"Initialized","status":"True","lastProbeTime":null,"lastTransitionTime":"2017-06-22T14:13:24Z"},{"type":"Ready","status":"False","lastProbeTime":null,"lastTransitionTime":"2017-06-22T14:13:24Z","reason":"ContainersNotReady","message":"containers with unready status: [private-reg-container]"},{"type":"PodScheduled","status":"True","lastProbeTime":null,"lastTransitionTime":"2017-06-22T14:13:24Z"}],"hostIP":"192.168.99.100","podIP":"172.17.0.5","startTime":"2017-06-22T14:13:24Z","containerStatuses":[{"name":"private-reg-container","state":{"waiting":{"reason":"CrashLoopBackOff","message":"Back-off 5m0s restarting failed container=private-reg-container pod=private-reg_default(f4340638-5754-11e7-978a-08002773375c)"}},"lastState":{"terminated":{"exitCode":0,"reason":"Completed","startedAt":null,"finishedAt":"2017-06-22T14:30:36Z","containerID":"docker://a4cb436a79b0b21bb385e544d424b2444a80ca66160ef21af30ab69ed2e23b32"}},"ready":false,"restartCount":8,"image":"ha/prod:latest","imageID":"docker://sha256:7335859e2071af518bcd0e2f373f57c1da643bb37c7e6bbc125d171ff98f71c0","containerID":"docker://a4cb436a79b0b21bb385e544d424b2444a80ca66160ef21af30ab69ed2e23b32"}],"qosClass":"BestEffort"}}
I0622 17:35:01.074108 15981 round_trippers.go:395] GET https://192.168.99.100:8443/api/v1/namespaces/default/pods/private-reg/log
I0622 17:35:01.074126 15981 round_trippers.go:402] Request Headers:
I0622 17:35:01.074132 15981 round_trippers.go:405] Accept: application/json, */*
I0622 17:35:01.074137 15981 round_trippers.go:405] User-Agent: kubectl/v1.6.6 (linux/amd64) kubernetes/7fa1c17
I0622 17:35:01.079257 15981 round_trippers.go:420] Response Status: 200 OK in 5 milliseconds
I0622 17:35:01.079289 15981 round_trippers.go:423] Response Headers:
I0622 17:35:01.079299 15981 round_trippers.go:426] Content-Type: text/plain
I0622 17:35:01.079307 15981 round_trippers.go:426] Content-Length: 0
I0622 17:35:01.079315 15981 round_trippers.go:426] Date: Thu, 22 Jun 2017 14:35:31 GMT
How can i debug this issue ?
Update
The output of:
kubectl --v=8 logs ps-agent-2028336249-3pk43 --namespace=default -p
I0625 11:30:01.569903 13420 round_trippers.go:395] GET
I0625 11:30:01.569920 13420 round_trippers.go:402] Request Headers:
I0625 11:30:01.569927 13420 round_trippers.go:405] User-Agent: kubectl/v1.6.6 (linux/amd64) kubernetes/7fa1c17
I0625 11:30:01.569934 13420 round_trippers.go:405] Accept: application/json, */*
I0625 11:30:01.599026 13420 round_trippers.go:420] Response Status: 200 OK in 29 milliseconds
I0625 11:30:01.599048 13420 round_trippers.go:423] Response Headers:
I0625 11:30:01.599056 13420 round_trippers.go:426] Date: Sun, 25 Jun 2017 08:30:01 GMT
I0625 11:30:01.599062 13420 round_trippers.go:426] Content-Type: application/json
I0625 11:30:01.599069 13420 round_trippers.go:426] Content-Length: 2794
I0625 11:30:01.599264 13420 request.go:991] Response Body: {"kind":"Pod","apiVersion":"v1","metadata":{"name":"ps-agent-2028336249-3pk43","generateName":"ps-agent-2028336249-","namespace":"default","selfLink":"/api/v1/namespaces/default/pods/ps-agent-2028336249-3pk43","uid":"87c69072-597e-11e7-83cd-08002773375c","resourceVersion":"14354","creationTimestamp":"2017-06-25T08:16:03Z","labels":{"pod-template-hash":"2028336249","run":"ps-agent"},"annotations":{"kubernetes.io/created-by":"{\"kind\":\"SerializedReference\",\"apiVersion\":\"v1\",\"reference\":{\"kind\":\"ReplicaSet\",\"namespace\":\"default\",\"name\":\"ps-agent-2028336249\",\"uid\":\"87c577b5-597e-11e7-83cd-08002773375c\",\"apiVersion\":\"extensions\",\"resourceVersion\":\"13446\"}}\n"},"ownerReferences":[{"apiVersion":"extensions/v1beta1","kind":"ReplicaSet","name":"ps-agent-2028336249","uid":"87c577b5-597e-11e7-83cd-08002773375c","controller":true,"blockOwnerDeletion":true}]},"spec":{"volumes":[{"name":"default-token-bhvgz","secret":{"secretName":"default-token-bhvgz","defaultMode":420}}],"containers":[{"name":"ps-agent","image":"ha/prod:ps-agent-latest","resources":{},"volumeMounts":[{"name":"default-token-bhvgz","readOnly":true,"mountPath":"/var/run/secrets/kubernetes.io/serviceaccount"}],"terminationMessagePath":"/dev/termination-log","terminationMessagePolicy":"File","imagePullPolicy":"IfNotPresent"}],"restartPolicy":"Always","terminationGracePeriodSeconds":30,"dnsPolicy":"ClusterFirst","serviceAccountName":"default","serviceAccount":"default","nodeName":"minikube","securityContext":{},"schedulerName":"default-scheduler"},"status":{"phase":"Running","conditions":[{"type":"Initialized","status":"True","lastProbeTime":null,"lastTransitionTime":"2017-06-25T08:16:03Z"},{"type":"Ready","status":"False","lastProbeTime":null,"lastTransitionTime":"2017-06-25T08:16:03Z","reason":"ContainersNotReady","message":"containers with unready status: [ps-agent]"},{"type":"PodScheduled","status":"True","lastProbeTime":null,"lastTransitionTime":"2017-06-25T08:16:03Z"}],"hostIP":"192.168.99.100","podIP":"172.17.0.5","startTime":"2017-06-25T08:16:03Z","containerStatuses":[{"name":"ps-agent","state":{"waiting":{"reason":"CrashLoopBackOff","message":"Back-off 5m0s restarting failed container=ps-agent pod=ps-agent-2028336249-3pk43_default(87c69072-597e-11e7-83cd-08002773375c)"}},"lastState":{"terminated":{"exitCode":0,"reason":"Completed","startedAt":null,"finishedAt":"2017-06-25T08:27:17Z","containerID":"docker://1aa9dfbfeb80042c6f4c8d04cabb3306ac1cd52963568e621019e2f1f0ee081b"}},"ready":false,"restartCount":7,"image":"ha/prod:ps-agent-latest","imageID":"docker://sha256:eb5307c4366fc129d022703625a5f30ff175b5e1a24dbe39fd4c32e726a0ee7b","containerID":"docker://1aa9dfbfeb80042c6f4c8d04cabb3306ac1cd52963568e621019e2f1f0ee081b"}],"qosClass":"BestEffort"}}
I0625 11:30:01.600727 13420 round_trippers.go:395] GET https://192.168.99.100:8443/api/v1/namespaces/default/pods/ps-agent-2028336249-3pk43/log?previous=true
I0625 11:30:01.600747 13420 round_trippers.go:402] Request Headers:
I0625 11:30:01.600757 13420 round_trippers.go:405] Accept: application/json, */*
I0625 11:30:01.600766 13420 round_trippers.go:405] User-Agent: kubectl/v1.6.6 (linux/amd64) kubernetes/7fa1c17
I0625 11:30:01.632473 13420 round_trippers.go:420] Response Status: 200 OK in 31 milliseconds
I0625 11:30:01.632545 13420 round_trippers.go:423] Response Headers:
I0625 11:30:01.632569 13420 round_trippers.go:426] Date: Sun, 25 Jun 2017 08:30:01 GMT
I0625 11:30:01.632592 13420 round_trippers.go:426] Content-Type: text/plain
I0625 11:30:01.632615 13420 round_trippers.go:426] Content-Length: 0