Issues with Lab in 3.1 on Ubuntu 22.04 on AWS

Hi, I hope this saves some other people a whole bunch of time. Following the instructions on the course didn't work for me - the control plane containers were in crash loops as nothing could talk to ectd (I think). Lots of these errors in sys log:

"Failed creating a mirror pod for" err="Post \"https://k8scp:6443/api/v1/namespaces/kube-system/pods\": dial tcp 172.31.12.59:6443: connect: connection refused" pod="kube-s ystem/kube-controller-manager-ip-172-31-12-59"

And loads of connection refused to localhost:2379 in the container logs (/var/log/containers/...)

I found a fix for the issue described here: https://stackoverflow.com/questions/55571566/unable-to-bring-up-kubernetes-api-server

Basically, after you've installed containerd and set up the config in these steps:

apt-get update && apt-get install containerd.io -y
containerd config default | tee /etc/containerd/config.toml

Do this:

sed -i 's/SystemdCgroup = false/SystemdCgroup = true/g' /etc/containerd/config.toml

BEFORE

systemctl restart containerd

And everything should work....