原文：https://www.cnblogs.com/wuchangblog/p/14088151.html

1、kubernetes集群认证文件目录：/root/.kube/config

2、calico网络认证文件目录：/etc/cni/net.d/calico-kubeconfig

3、cni插件目录：/etc/cni/net.d

4、kubelet配置文件目录：/usr/lib/systemd/system/kubelet.service.d/10-kubeadm.conf

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Note: This dropin only works with kubeadm and kubelet v1.11+

[Service]
Environment=“KUBELET_KUBECONFIG_ARGS=–bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf”
Environment=“KUBELET_CONFIG_ARGS=–config=/var/lib/kubelet/config.yaml”

This is a file that “kubeadm init” and “kubeadm join” generates at runtime, populating the KUBELET_KUBEADM_ARGS variable dynamically

EnvironmentFile=-/var/lib/kubelet/kubeadm-flags.env

This is a file that the user can use for overrides of the kubelet args as a last resort. Preferably, the user should use

the .NodeRegistration.KubeletExtraArgs object in the configuration files instead. KUBELET_EXTRA_ARGS should be sourced from this file.

EnvironmentFile=-/etc/sysconfig/kubelet
ExecStart=
ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELE{T}_{E}XTR{A}_{A}RGS最后一行里的$KUBELET_NETWORK_ARGS指定启动相关参数，封装在/var/lib/kubelet/kubeadm-flags.env

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[root@k8s ~]# cat /var/lib/kubelet/kubeadm-flags.env
KUBELET_KUBEADM_ARGS=–cgroup-driver=systemd --cni-bin-dir=/opt/cni/bin --cni-conf-dir=/etc/cni/net.d --network-plugin=cni

重启kubelet：
systemctl enable kubelet && systemctl start kubelet