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Lab 3.1 Install Kubernetes 4.b.x Configure kubelet to understand how to interact with crio

MichalWiczynski
MichalWiczynski Posts: 12
in LFS258 Class Forum

The latest manual states: [email protected]: ̃# vim /etc/default/kubelet

  1. There is no such file, so I created one
  2. In the step 14, when I run kubelet init... I get the response: Found multiple CRI sockets meaning the file I just created is not being used by the kubelet command.
  3. I am using ubuntu 18.04 with the following kube* versions:
    Setting up kubelet (1.18.1-00) ... Setting up kubectl (1.18.1-00) ... Setting up kubeadm (1.18.1-00) ...

So far I have spent over 3 hours on troubleshooting instead of learning something

Comments

  • chrispokorni
    chrispokorni Posts: 1,284

    Hi @MichalWiczynski,

    One nice feature of vim editor is that it automatically creates a file for you if it is not found, so there is no need to first create a file and then edit that file with vim.

    Multiple CRI indicate multiple runtimes. Did you happen to install both Docker (a) and CRI-O (b) in step 4?

    Regards,
    -Chris

  • MichalWiczynski
    MichalWiczynski Posts: 12
    edited May 2020

    @chrispokorni said:
    Hi @MichalWiczynski,

    One nice feature of vim editor is that it automatically creates a file for you if it is not found, so there is no need to first create a file and then edit that file with vim.

    This was purely informational

    Multiple CRI indicate multiple runtimes. Did you happen to install both Docker (a) and CRI-O (b) in step 4?

    Yes I did install both, and I want to use cri-o, which has been defined in my previous step when I created /etc/default/kubelet file with contents pasted from the course PDF: KUBELET_EXTRA_ARGS=--fiature-gates="AllAlpha=false,RunAsGroup=true" --container-runtime=remote --cgroup-driver=systemd --container-runtime-endpoint='unix:///var/run/crio/crio.sock' --runtime-request-timeout=5m

  • chrispokorni
    chrispokorni Posts: 1,284

    In my version of the lab manual, there is a note in step 4 advising to install one runtime or the other, and the expected outcome once both runtimes are installed.
    Perhaps you have a different version where this note is missing?

    Regards,
    -Chris

  • MichalWiczynski
    MichalWiczynski Posts: 12

    No, I have installed both and I have defined one of them exactly like specified in the course and that was the output I got.

    And again, I am not looking for alternative ways of achieving the same, I am after the explanation: why, when I follow the paid course, things do not work.

  • serewicz
    serewicz Posts: 976

    Read the course again. You are not following it. It clearly states install one or the other. Not both.

  • chrispokorni
    chrispokorni Posts: 1,284

    Hi @MichalWiczynski,

    You may find the desired explanation in the official documentation:

    https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/

    Regards,
    -Chris

  • MichalWiczynski
    MichalWiczynski Posts: 12

    Thanks, it works now with both

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