Huh... on the Mac I'm getting this:

"Failed to run kubelet" err="failed to run Kubelet: could not detect clock speed from output: \"processor\\t: 0\\nBogoMIPS\\t: 48.00\\n..." component=kubelet

Going to try setting the cgroupfs volume mount as rw (I had it ro) as suggested here: k0sproject/k0s#1493

I was able to get this branch to work for installing k8s on a group of Ubuntu 20.04 machines. A few things:

• I set up containerd on each node first, following the 'option 2' using apt-get here
• I then had to edit /etc/containerd/config.toml on each node and remove "CRI" from the disabled_plugins list. I then added the blurb about setting SystemdCgroup = true as explained here and restarted containerd

^ I get that these two bullet points are really outside of the scope for your role, but just putting them here for complete-ness. For your role specifically, I had to:

• Add net.ipv4.ip_forward to your Let iptables see bridged traffic task (To avoid preflight errors when the nodes were joining the cluster) AND I wrapped that entire file with a become block (become: yes, become_user: root, become_method: sudo) Otherwise, it complained: "cannot stat /proc/sys/net/ipv4/ip-forward: No such file or directory"

EDIT: the become block may have not been necessary. I think I was doing ip-forward instead of ip_forward and maybe that was the cause of the issue. I'll have to retry some more, but either way I think you need to add net.ipv4.ip_forward to that task to enable ip forwarding

Ok update. I needed the become block and I also needed to ensure that the br_netfilter module was enabled in order to modify bridge-nf-call-iptables. Here's the whole sysctl-setup.yml file I used:

---
- block:
  
  - name: Enable br_netfilter module
    modprobe:
      name: br_netfilter
      state: present
    
  - name: Ensure procps is installed.
    package:
      name: "{{ procps_package }}"
      state: present
    when: >
      ansible_distribution != 'Debian'
      or ansible_distribution_major_version | int < 10

  # See: https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/#letting-iptables-see-bridged-traffic
  - name: Let iptables see bridged traffic.
    sysctl:
      name: "{{ item }}"
      value: '1'
      state: present
    loop:
      - net.bridge.bridge-nf-call-iptables
      - net.bridge.bridge-nf-call-ip6tables
      - net.ipv4.ip_forward
    when: >
      ansible_distribution != 'Debian'
      or ansible_distribution_major_version | int < 10

  become: yes
  become_user: root
  become_method: sudo