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13-Practice-Test-CNI-weave.md

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Practice Test - CNI weave

Solution

  1. Inspect the kubelet service and identify the container runtime value is set for Kubernetes.

    Check kubelet unit file

    systemctl cat kubelet

    Note from the output this line

    EnvironmentFile=-/var/lib/kubelet/kubeadm-flags.env

    Inspect this file

    cat /var/lib/kubelet/kubeadm-flags.env

    Answer can be found as value of --container-runtime

    REMOTE

  2. What is the path configured with all binaries of CNI supported plugins?

    This is the standard location for the installation of CNI plugins

    | /opt/cni/bin

  3. Identify which of the below plugins is not available in the list of available CNI plugins on this host? 
    ls -l /opt/cni/bin

    Find the option from the given answers not in the output opf the above

    cisco

  4. What is the CNI plugin configured to be used on this kubernetes cluster?

    From the available options, we need to recognise which of the four is not the name of a container networking provider. Of the three that are, only one of them is present in /opt/cni/bin

    flannel

    Note that bridge is a mechanism for connecting networks together, and not a network provider.

  5. What binary executable file will be run by kubelet after a container and its associated namespace are created.

    Following on from Q4...

    flannel

    All the files in /opt/cni/bin are binary executables with tasks related to configuring network namespaces. After the network namespace is configured using the other programs, flannel implements the network.

    This is a great article on what the programs in /opt/cni/bin are for.