Kubernetes Pod fails with CrashLoopBackOff

Question

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       lt none gt  Annotations      lt none gt  Status      Running IP      172 17 0 5 Controllers      lt none gt  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      lt none gt      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   lt none gt  Tolerations      lt none gt  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     lt invalid gt    40  kubelet  minikube   spec containers private-reg-container   Warning BackOff     Back-off restarting failed container   2m     lt invalid gt    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

User · Answer

The issue caused by the docker container which exits as soon as the  start  process finishes  i added a command that runs forever and it worked  This issue mentioned here

User · Answer

Pod is not started due to problem coming after initialization of POD   Check and use command to get docker container of pod  docker ps -a   grep private-reg   Output will be information of docker container with id   See docker logs   docker logs -f  lt container id gt

User · Answer

I had similar situation  I found that one of my config maps was duplicated  I had two configmaps for the same namespace  One had the correct namespace reference  the other was pointing to the wrong namespace    I deleted and recreated the configmap with the correct file  or fixed file   I am only using one  and that seemed to make the particular cluster happier    So I would check the files for any typos or duplicate items that could be causing conflict

User · Answer

I faced similar issue  CrashLoopBackOff  when I debugged getting pods and logs of pod  Found out that my command arguments are wrong

User · Answer

I ran into the same error   NAME         READY   STATUS             RESTARTS   AGE pod webapp   0 1     CrashLoopBackOff   5          47h   My problem was that I was trying to run two different pods with the same metadata name   kind  Pod metadata    name  webapp   labels       To find all the names of your pods run  kubectl get pods  NAME         READY   STATUS    RESTARTS   AGE webapp       1 1     Running   15         47h   then I changed the conflicting pod name and everything worked just fine   NAME                 READY   STATUS    RESTARTS   AGE webapp               1 1     Running   17         2d webapp-release-0-5   1 1     Running   0          13m

[docker] Kubernetes Pod fails with CrashLoopBackOff

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