Trying to create a cluster on microOS nodes fails. Installer logs these lines:

[Control plane] Generating the kubeconfig file to /home/matteo/dev/tests/hetznerk3s/kubeconfig...
error: no context exists with the name: "test-master2"
[Control plane] ...kubeconfig file generated as /home/matteo/dev/tests/hetznerk3s/kubeconfig/kubeconfig.
Unhandled exception in spawn: timeout after 00:00:30 (Tasker::Timeout)
  from /usr/lib/crystal/core/channel.cr:453:10 in 'timeout'
  from /home/runner/work/hetzner-k3s/hetzner-k3s/src/kubernetes/installer.cr:124:7 in 'run'
  from /usr/lib/crystal/core/fiber.cr:143:11 in 'run'
  from ???

After some debugging i think i understand why it is failing.

When the k3s installation script is downloaded and executed on the master node, the script terminates by enabling the k3s systemd service but DOESN'T start it. As a result, the /etc/rancher/k3s/k3s.yaml kubeconfig DOESN'T get created, and the whole installation process fails.

I've taken a look a the k3s installation script, and i could be wrong on this, but i think the reason why the script doesn't start the systemd process is because at some point it sets the INSTALL_K3S_SKIP_START variable to true, and when the it reaches the following line -> [ "${INSTALL_K3S_SKIP_ENABLE}" = true ] && return, the script exits without starting the systemd service.

I think the point where the script sets INSTALL_K3S_SKIP_ENABLE to true is here ->

case ${3} in
       sle)
           rpm_installer="zypper --gpg-auto-import-keys"
           if [ "${TRANSACTIONAL_UPDATE=false}" != "true" ] && [ -x /usr/sbin/transactional-update ]; then
               transactional_update_run="transactional-update --no-selfupdate -d run"
               rpm_installer="transactional-update --no-selfupdate -d run ${rpm_installer}"
               : "${INSTALL_K3S_SKIP_START:=true}"
           fi

Again, i could be wrong, so take it just as an intuition on what could be the problem here.

To make the installation process work, i had to hardcode INSTALL_K3S_SKIP_START=false into master_install_script.sh ->

curl -sfL https://get.k3s.io | INSTALL_K3S_VERSION="{{ k3s_version }}" K3S_TOKEN="{{ k3s_token }}" {{ datastore_endpoint }} INSTALL_K3S_SKIP_START=false INSTALL_K3S_EXEC=...

and generate a new binary.

I think having the possibility to customize the k3s installation script by passing extra variables is needed to resolve this particular issue.