Kubernetes的配置目录包括/etc/kubernetes、/home/supermap/.kube和/var/lib/kubelet目录。
下面我们来看一看，这些目录里到底有些什么文件（操作系统使用Ubuntu 18.04LTS desktop）。
安装tree命令：
sudo apt install tree
1、kubernetes主配置目录
显示/etc/kubernetes目录结构：
supermap@podc01:/etc/kubernetes$ tree ..├── admin.conf├── controller-manager.conf├── kubelet.conf├── manifests│ ├── etcd.yaml│ ├── kube-apiserver.yaml│ ├── kube-controller-manager.yaml│ └── kube-scheduler.yaml├── pki│ ├── apiserver.crt│ ├── apiserver-etcd-client.crt│ ├── apiserver-etcd-client.key│ ├── apiserver.key│ ├── apiserver-kubelet-client.crt│ ├── apiserver-kubelet-client.key│ ├── ca.crt│ ├── ca.key│ ├── etcd│ │ ├── ca.crt│ │ ├── ca.key│ │ ├── healthcheck-client.crt│ │ ├── healthcheck-client.key│ │ ├── peer.crt│ │ ├── peer.key│ │ ├── server.crt│ │ └── server.key│ ├── front-proxy-ca.crt│ ├── front-proxy-ca.key│ ├── front-proxy-client.crt│ ├── front-proxy-client.key│ ├── sa.key│ └── sa.pub├── scheduler.conf└── tmp [error opening dir]4 directories, 30 files
2、kubernetes用户配置目录
主用户目录下的隐藏目录.kube包含用户的配置参数和缓存数据。目录结构为：
/home/supermap/.kube├── cache│ └── discovery│ ├── 10.1.1.181_6443│ └── 10.1.1.201_6443├── config└── http-cache ├── 028d83935e12ce471cbe29f4096ef4ed
其中，配置文件config的内容为：
apiVersion: v1clusters:- cluster: certificate-authority-data: LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0t... server: https://10.1.1.201:6443 name: kubernetescontexts:- context: cluster: kubernetes user: kubernetes-admin name: kubernetes-admin@kubernetescurrent-context: kubernetes-admin@kuberneteskind: Configpreferences: {}users:- name: kubernetes-admin user: client-certificate-data: LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1... client-key-data: LS0tLS1CRUdJTiBSU0EgUFJJVkFURSBLRVktLS0tLQpNSUl... 3、kubelet服务的配置目录
每一个ks节点都需要运行kubelet服务。kubelet服务的配置在/var/lib/kubelet目录下：
supermap@podc01:/var/lib/kubelet$ tree.├── config.yaml├── cpu_manager_state├── device-plugins│ ├── DEPRECATION│ ├── kubelet_internal_checkpoint│ └── kubelet.sock├── kubeadm-flags.env├── pki│ ├── kubelet-client-2018-11-23-10-08-12.pem│ ├── kubelet-client-2018-11-23-10-08-38.pem│ ├── kubelet-client-current.pem -> /var/lib/kubelet/pki/kubelet-client-2018-11-23-10-08-38.pem│ ├── kubelet.crt│ └── kubelet.key├── plugin-containers [error opening dir]├── plugins [error opening dir]├── plugins_registry [error opening dir]├── pod-resources [error opening dir]└── pods [error opening dir]7 directories, 11 files
4、kubelet.service服务目录
kubelet使用systemd管理，service定义文件位于： /lib/systemd/system/kubelet.service。
最新的dropin文件位于： /etc/systemd/system/kubelet.service.d，内容为：
supermap@podc01:/etc/systemd/system/kubelet.service.d$ cat 10-kubeadm.conf # 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 dynamicallyEnvironmentFile=-/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/default/kubeletExecStart=ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS
可以看到，在新的kubernetes配置结构中，这个kublet服务参数的配置有了很大的变化。启动参数不再放在kubelet.service文件里了，放到了/var/lib/kubelet、/etc/default/kubelet。
- 注意，这个变化可能会导致以前的很多手动安装的脚本工具不再可用。