kubespray/roles/kubernetes/node/templates/kubelet.service.j2

[Unit]
Description=Kubernetes Kubelet Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
{% if kube_network_plugin is defined and kube_network_plugin == "calico" %}
After=docker.service calico-node.service
{% else %}
After=docker.service
{% endif %}

[Service]
EnvironmentFile=/etc/kubernetes/config
EnvironmentFile=/etc/network-environment
ExecStart={{ bin_dir }}/kubelet \
	    $KUBE_LOGTOSTDERR \
	    $KUBE_LOG_LEVEL \
	    $KUBELET_API_SERVER \
	    $KUBELET_ADDRESS \
	    $KUBELET_PORT \
	    $KUBELET_HOSTNAME \
	    $KUBE_ALLOW_PRIV \
	    $KUBELET_ARGS \
	    $KUBELET_REGISTER_NODE \
	    $KUBELET_NETWORK_PLUGIN
Restart=on-failure

[Install]
WantedBy=multi-user.target