Still unable to join worker node to master node, please help

tstaffordsmith

when I run the kubeadm join command on my worker node, I get this output:

[preflight] Running pre-flight checks
[WARNING SystemVerification]: missing optional cgroups: blkio

lf1d

Are you using Ubuntu 20.04, or a newer version?

tstaffordsmith

@if1d yes, using Ubuntu 22.04

lf1d

@tstaffordsmith, the labs support Ubuntu version 20.04. You are using version 22.04.

The solution is to use Ubuntu 20.04.

jakub.przybyla

I had the same issue, but on Ubuntu 20.04, which was suggested in labs. I exposed port:6443 in Security Group of my AWS EC2 instance and worked.

ashishsantikari

Try not enabling firewall during the EC2 setup and you should be good to go

chrispokorni

Hi @jakub.przybyla,

I would recommend watching the demo video from the introductory chapter that presents critical configuration options for setting up the VPC, SG, and the EC2 instances on AWS.

Regards,
-Chris

jakub.przybyla

Hi @chrispokorni ,
I went through the initial SG configuration proposed in video and the way was to open all traffic to all ports, not just 6443, apparently I have missed it. Thanks for the hint!