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have you tried --kubelet-arg or --kube-apiserver-arg or whatever component you want to pass those args to?

Thanks, got it now. Extending

ExecStart=/usr/local/bin/k3s server

in

/etc/systemd/system/k3s.service

did the trick. For everyone who’s following that, my HA config in

k3s.service

is now:

...
ExecStart=/usr/local/bin/k3s \
    server \
        '--cluster-init' \
        '--kubelet-arg' \
        'node-status-update-frequency=4s' \
        '--kube-controller-manager-arg' \
        'node-monitor-period=4s' \
        '--kube-controller-manager-arg' \
        'node-monitor-grace-period=16s' \
        '--kube-controller-manager-arg' \
        'pod-eviction-timeout=20s' \
        '--kube-apiserver-arg' \
        'default-not-ready-toleration-seconds=20' \
        '--kube-apiserver-arg' \
        'default-unreachable-toleration-seconds=20' \