背景
最近，我在虚拟机上通过rpm包安装了k8s集群。我想创建静态Pod，那么就需要更改kubelet的启动参数。相关环境信息如下：
| role | OS | IP | module |
|---|
| Master | Centos7.2 | 10.1.2.182 | kube-apiserver kube-controller-manager kube-scheduler |
| Node1 | Centos7.2 | 10.1.2.183 | kubelet kube-proxy |
| Node2 | Centos7.2 | 10.1.2.184 | kubelet kube-proxy |
一、查看kubelet启动参数
k8s组件是通过systemctl来管理的，因此可以在/etc/systemd/system
或/usr/lib/systemd/system下查找相关配置文件
找到kubelet对应服务的配置文件目录
# cd /etc/systemd/system/kubelet.service.d/
查看原文件内容
# 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
查看kubelet的相关启动参数
# 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启动参数
添加一个新的参数 –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
执行如下命令使新增参数生效
# systemctl stop kubelet
# systemctl daemon-reload
# systemctl start kubelet
检查新增参数是否已经生效
# 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，此方法也可添加kubelet其他启动参数。
