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Exercise 2.2 - Worker Node is Not Showing Up When I Run The Command: kubectl get node

Posts: 7
edited March 2022 in LFD259 Class Forum

Hi, I'm working on "Exercise 2.2: Deploy a New Cluster" and on step #11, I'm not getting the expected output for step 11. My output doesn't include the worker node and I haven't been able to figure out why.

So when I run the following command I get the following output:

kubectl get node

  1. NAME STATUS ROLES AGE VERSION
  2. cp Ready control-plane,master 28m v1.23.1

I think I might of messed up step #8. After I completed step #7 my worker node output

  1. You will need to type sudo then copy the entire *kubeadm join*
  2. command from the cp to this worker.
  3. If not on the screen you may need to grep -A1 join cp.out on
  4. the cp node.

But I have no idea where this command they're talking about is in the cp node. In my cp node terminal, nothing pops up at all.

I'm unsure of what I skipped/messed up but this is my first time working with bash files/linux so if you could help me walk through exercise 2.2 until I've finished, I would greatly appreciate it.

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  • UPDATE: I recreated all my Google Cloud VM instances and redid all the steps but I'm still stuck at step #8. When I run the command
    sudo kubeadm join --token 118c3e.83b49999dc5dc034 \ 10.128.0.3:6443 --discovery-token-ca-cert-hash \ sha256:40aa946e3f53e38271bae24723866f56c86d77efb49aedeb8a70cc189bfe2e1d

    My terminal just remains stuck on [preflight] Running pre-flight checks indefinitely.

  • Posts: 2,443

    Hi @parkershamblin,

    The command presented in the lab guide is the example command that the author has used. You should pay close attention to step 8, where it reads:

    Your nodes will use a different IP address and hashes than the example below.

    Meaning that the join command you are expected to use for your cluster will use an IP address that is extracted from your control-plane node, token and hash generated by your control-plane node.

    Familiarity with basic Linux commands and tools is required for this course, such as: sudo, cd, ls, grep, echo, vim, cat, more, less, tee, curl, ip. They may not be explicitly presented in the lab guide, but knowing how to use them will help you to easily navigate the exercises.

    Regards,
    -Chris

  • Posts: 7
    edited March 2022

    Hi @chrispokornip

    Meaning that the join command you are expected to use for your cluster will use an IP address that is extracted from your control-plane node, token and hash generated by your control-plane node.

    I understand my join command will have it's own ip address, however, I'm not able to find it in my control-panel node after running the steps provided.

  • Hi @chrispokornip I found the join command. It was a little difficult in the output but I eventually saw it.

  • Posts: 1,000

    The join command is also in the cp.out file. A command like grep join -A3 cp.out would show the full join command.

  • Hi all, this was super helpful, BUT -
    My pre-flight check returns

    1. The cluster-info ConfigMap does not yet contain a JWS signature for token ID "the-first-few-characters-of-the-token".

    Any thoughts here?!

    The end of the more verbose logged version of the "kubeadm join" command output is

    1. running all checks
    2. checking whether the given node name is valid and reachable using net.LookupHost
    3. validating kubelet version
    4. validating if the "kubelet" service is enabled and active
    5. validating availability of port 10250
    6. validating the existence of file /etc/kubernetes/pki/ca.crt
    7. validating if the connectivity type is via proxy or direct
    8. Discovering cluster-info
    9. Created cluster-info discovery client, requesting info from "the.ip.addr:6443"
    10. The cluster-info ConfigMap does not yet contain a JWS signature for token ID "token-characters", will try again
    11. The cluster-info ConfigMap does not yet contain a JWS signature for token ID "token-characters", will try again
    12. The cluster-info ConfigMap does not yet contain a JWS signature for token ID "token-characters", will try again

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