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lab 3.2 post simpleapp deployment not working

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santoshsub123
santoshsub123 Posts: 18
in LFD259 Class Forum

wherever simpleapp is referenced in future labs i am getting error imagebackoff in pod status and when i describe i am getting error

Warning Failed 14s (x2 over 31s) kubelet, 2b7fb2b29d1c.mylabserver.com Failed to pull image "10.100.28.200:5000/simpleapp": rpc error: code = Unknown desc = Error response from daemon: manifest for 10.100.28.200:5000/simpleapp:latest not found: manifest unknown: manifest unknown

Normal BackOff 0s (x3 over 30s) kubelet, 2b7fb2b29d1c.mylabserver.com Back-off pulling image "10.100.28.200:5000/simpleapp"
Warning Failed 0s (x3 over 30s) kubelet, 2b7fb2b29d1c.mylabserver.com Error: ImagePullBackOff

kindly suggest next steps how to debug this issue.

Thanks

Comments

  • serewicz
    serewicz Posts: 1,000
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    Hello,

    There are a few reasons this could happen. The most common one I have encountered is when docker is configured on the master but not on the worker. Second most common is a typo in the image name.

    When you run sudo docker image do you see the simpleapp image? If you use sudo docker pull 10.100.28.200:5000/simpleapp on the master and worker does it work?

    Regards,

  • suser
    suser Posts: 67
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    Hello,
    I keep having the same problem after rebooting the master node. Apparently the image needed for try1 deployment do not persists on reboot.

    vio@kmaster:~$ kubectl get po
    NAME READY STATUS RESTARTS AGE
    nginx-b68dd9f75-vq6vr 1/1 Running 1 21h
    registry-cbc9b4779-5qqq5 1/1 Running 5 2d23h
    try1-85f7fc6ddf-8m766 0/1 ImagePullBackOff 0 20h
    try1-85f7fc6ddf-9lbc7 0/1 ImagePullBackOff 0 20h
    try1-85f7fc6ddf-c958k 0/1 ImagePullBackOff 0 20h
    try1-85f7fc6ddf-fkxg5 0/1 ImagePullBackOff 0 20h
    try1-85f7fc6ddf-mkmgs 0/1 ImagePullBackOff 0 20h
    try1-85f7fc6ddf-x5snl 0/1 ErrImagePull 0 20h

    The repository looks good and running.
    What I have to do is to push again the needed image:
    sudo docker push 10.107.241.131:5000/simpleapp

    After this the try1- pods start one after another in few seconds.

    What to do to fix the image persistence?

    Stefan

  • chrispokorni
    chrispokorni Posts: 2,165
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    Hi @suser,

    The registry is cleaned up at reboot because the Persistent Volume uses /tmp/... as the hostPath: . You can edit your vol1.yaml and vol2.yaml manifests and update the path: property found under hostPath: to point to a different host directory.

    Regards,
    -Chris

  • santoshsub123
    santoshsub123 Posts: 18
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    Hi @chrispokorni to fix persistence do we need to create that directory on container using exec please advise.
    thanks santosh

  • chrispokorni
    chrispokorni Posts: 2,165
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    Hi @santoshsub123,

    Creating the hostPath directory anywhere on the Node/host is fine, as long as it is not in /tmp.

    Regards,
    -Chris

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