背景

最近，我在虛擬機器上通過rpm包安裝了k8s叢集。我想建立靜態Pod，那麼就需要更改kubelet的啟動引數。相關環境資訊如下：

一、檢視kubelet啟動引數

k8s元件是通過systemctl來管理的，因此可以在/etc/systemd/system
或/usr/lib/systemd/system下查詢相關配置檔案

找到kubelet對應服務的配置檔案目錄
# cd /etc/systemd/system/kubelet.service.d/   

檢視原檔案內容
# cat 10-kubeadm.conf
[Service]
Environment="KUBELET_KUBECONFIG_ARGS=--config=/etc/kubelet.d/ --kubeconfig=/etc/kubernetes/kubelet.conf --require-kubeconfig=true"
 

Environment="KUBELET_SYSTEM_PODS_ARGS=--pod-manifest-path=/etc/kubernetes/manifests --allow-privileged=true"
Environment="KUBELET_NETWORK_ARGS=--network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin"
Environment="KUBELET_DNS_ARGS=--cluster-dns=10.12.0.10 --cluster-domain=cluster.local"
Environment="KUBELET_EXTRA_ARGS=--v=4"
 

ExecStart=
ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_SYSTEM_PODS_ARGS $KUBELET_NETWORK_ARGS $KUBELET_DNS_ARGS $KUBELET_EXTR
A_ARGS

檢視kubelet的相關啟動引數
# ps -ef | grep kubelet
/usr/bin/kubelet  --kubeconfig=/etc/kubernetes/kubelet.conf --require-kubeconfig=true --pod-manifest-path=/etc/kubernetes/manifests --allow-privileged=true --network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin --cluster-dns=10.12.0.10 --cluster-domain=cluster.local --v=4

二、修改kubelet啟動引數

新增一個新的引數 –config

# vim 10-kubeadm.conf
[Service]
Environment="KUBELET_KUBECONFIG_ARGS=--config=/etc/kubelet.d/ --kubeconfig=/etc/kubernetes/kubelet.conf --require-kubeconfig=true"
Environment="KUBELET_SYSTEM_PODS_ARGS=--pod-manifest-path=/etc/kubernetes/manifests --allow-privileged=true"
Environment="KUBELET_NETWORK_ARGS=--network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin"
Environment="KUBELET_DNS_ARGS=--cluster-dns=10.12.0.10 --cluster-domain=cluster.local"
Environment="KUBELET_EXTRA_ARGS=--v=4"
ExecStart=
ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_SYSTEM_PODS_ARGS $KUBELET_NETWORK_ARGS $KUBELET_DNS_ARGS $KUBELET_EXTR
A_ARGS

執行如下命令使新增引數生效
# systemctl stop kubelet
# systemctl daemon-reload
# systemctl start kubelet

檢查新增引數是否已經生效
# ps -ef | grep kubelet
/usr/bin/kubelet --config=/etc/kubelet.d/ --kubeconfig=/etc/kubernetes/kubelet.conf --require-kubeconfig=true --pod-manifest-path=/etc/kubernetes/manifests --allow-privileged=true --network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin --cluster-dns=10.12.0.10 --cluster-domain=cluster.local --v=4

同理，此方法也可新增kubelet其他啟動引數。