获取k8s集群信息`kubectlcluster-info`

获取k8s集群信息`kubectl cluster-info`

1. 查看集群信息

kubernetes集群的基本搭建，请参考K8S集群部署。

之前我设置了快捷命令：

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alias k8let='kubelet'
alias k8adm='kubeadm'
alias k8ctl='kubectl'

在k8s集群基本配置好后，可以查看k8s集群信息。

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[root@k8s-master ~]# k8ctl cluster-info
Kubernetes master is running at https://kubeapi.mytest.com:6443
KubeDNS is running at https://kubeapi.mytest.com:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy

To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
[root@k8s-master ~]#

如果我们直接在浏览器中访问 https://kubeapi.mytest.com:6443，此时会提示匿名用户禁止访问：

2. 问题处理

为了能够在浏览器中正常访问接口，我们需要生成证书。参考文档1中的方法生成.p12证书：

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## 生成client-certificate-data
[root@k8s-master ~]# grep 'client-certificate-data' ~/.kube/config | head -n 1 | awk '{print $2}' | base64 -d >> kubecfg.crt

## 生成client-key-data
[root@k8s-master ~]# grep 'client-key-data' ~/.kube/config | head -n 1 | awk '{print $2}' | base64 -d >> kubecfg.key

## 生成p12个人证书文件
[root@k8s-master ~]# openssl pkcs12 -export -clcerts -inkey kubecfg.key -in kubecfg.crt -out kubecfg.p12 -name "kubernetes-client"
Enter Export Password: # <--- 注意，此处需要输入导出密码，如123456
Verifying - Enter Export Password: # <--- 注意，此处需要再次输入导出密码，如123456

## 此时可以查看kubecfg相关的三个文件
[root@k8s-master ～]# ll kubecfg*
-rw-r--r-- 1 root root 1082 Dec  5 20:11 kubecfg.crt
-rw-r--r-- 1 root root 1675 Dec  5 20:19 kubecfg.key
-rw-r--r-- 1 root root 2464 Dec  5 20:20 kubecfg.p12

此时将kubecfg.p12证书文件传输到自己的电脑上，我下载到桌面上后，然后双击kubecfg.p12文件进行安装，安装后可以看到证书信息：

3. 问题验证

关闭chrome浏览器后，再次打开浏览器，然后打开 https://kubeapi.mytest.com:6443/ 链接。此时让选择证书：

在弹出的界面直接点击[确认]按钮即可，此时就可以正常显示接口页面信息：

页面输出的所有接口信息如下：

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{
  "paths": [
    "/api",
    "/api/v1",
    "/apis",
    "/apis/",
    "/apis/admissionregistration.k8s.io",
    "/apis/admissionregistration.k8s.io/v1",
    "/apis/admissionregistration.k8s.io/v1beta1",
    "/apis/apiextensions.k8s.io",
    "/apis/apiextensions.k8s.io/v1",
    "/apis/apiextensions.k8s.io/v1beta1",
    "/apis/apiregistration.k8s.io",
    "/apis/apiregistration.k8s.io/v1",
    "/apis/apiregistration.k8s.io/v1beta1",
    "/apis/apps",
    "/apis/apps/v1",
    "/apis/authentication.k8s.io",
    "/apis/authentication.k8s.io/v1",
    "/apis/authentication.k8s.io/v1beta1",
    "/apis/authorization.k8s.io",
    "/apis/authorization.k8s.io/v1",
    "/apis/authorization.k8s.io/v1beta1",
    "/apis/autoscaling",
    "/apis/autoscaling/v1",
    "/apis/autoscaling/v2beta1",
    "/apis/autoscaling/v2beta2",
    "/apis/batch",
    "/apis/batch/v1",
    "/apis/batch/v1beta1",
    "/apis/certificates.k8s.io",
    "/apis/certificates.k8s.io/v1beta1",
    "/apis/coordination.k8s.io",
    "/apis/coordination.k8s.io/v1",
    "/apis/coordination.k8s.io/v1beta1",
    "/apis/discovery.k8s.io",
    "/apis/discovery.k8s.io/v1beta1",
    "/apis/events.k8s.io",
    "/apis/events.k8s.io/v1beta1",
    "/apis/extensions",
    "/apis/extensions/v1beta1",
    "/apis/networking.k8s.io",
    "/apis/networking.k8s.io/v1",
    "/apis/networking.k8s.io/v1beta1",
    "/apis/node.k8s.io",
    "/apis/node.k8s.io/v1beta1",
    "/apis/policy",
    "/apis/policy/v1beta1",
    "/apis/rbac.authorization.k8s.io",
    "/apis/rbac.authorization.k8s.io/v1",
    "/apis/rbac.authorization.k8s.io/v1beta1",
    "/apis/scheduling.k8s.io",
    "/apis/scheduling.k8s.io/v1",
    "/apis/scheduling.k8s.io/v1beta1",
    "/apis/storage.k8s.io",
    "/apis/storage.k8s.io/v1",
    "/apis/storage.k8s.io/v1beta1",
    "/healthz",
    "/healthz/autoregister-completion",
    "/healthz/etcd",
    "/healthz/log",
    "/healthz/ping",
    "/healthz/poststarthook/apiservice-openapi-controller",
    "/healthz/poststarthook/apiservice-registration-controller",
    "/healthz/poststarthook/apiservice-status-available-controller",
    "/healthz/poststarthook/bootstrap-controller",
    "/healthz/poststarthook/crd-informer-synced",
    "/healthz/poststarthook/generic-apiserver-start-informers",
    "/healthz/poststarthook/kube-apiserver-autoregistration",
    "/healthz/poststarthook/rbac/bootstrap-roles",
    "/healthz/poststarthook/scheduling/bootstrap-system-priority-classes",
    "/healthz/poststarthook/start-apiextensions-controllers",
    "/healthz/poststarthook/start-apiextensions-informers",
    "/healthz/poststarthook/start-cluster-authentication-info-controller",
    "/healthz/poststarthook/start-kube-aggregator-informers",
    "/healthz/poststarthook/start-kube-apiserver-admission-initializer",
    "/livez",
    "/livez/autoregister-completion",
    "/livez/etcd",
    "/livez/log",
    "/livez/ping",
    "/livez/poststarthook/apiservice-openapi-controller",
    "/livez/poststarthook/apiservice-registration-controller",
    "/livez/poststarthook/apiservice-status-available-controller",
    "/livez/poststarthook/bootstrap-controller",
    "/livez/poststarthook/crd-informer-synced",
    "/livez/poststarthook/generic-apiserver-start-informers",
    "/livez/poststarthook/kube-apiserver-autoregistration",
    "/livez/poststarthook/rbac/bootstrap-roles",
    "/livez/poststarthook/scheduling/bootstrap-system-priority-classes",
    "/livez/poststarthook/start-apiextensions-controllers",
    "/livez/poststarthook/start-apiextensions-informers",
    "/livez/poststarthook/start-cluster-authentication-info-controller",
    "/livez/poststarthook/start-kube-aggregator-informers",
    "/livez/poststarthook/start-kube-apiserver-admission-initializer",
    "/logs",
    "/metrics",
    "/openapi/v2",
    "/readyz",
    "/readyz/autoregister-completion",
    "/readyz/etcd",
    "/readyz/informer-sync",
    "/readyz/log",
    "/readyz/ping",
    "/readyz/poststarthook/apiservice-openapi-controller",
    "/readyz/poststarthook/apiservice-registration-controller",
    "/readyz/poststarthook/apiservice-status-available-controller",
    "/readyz/poststarthook/bootstrap-controller",
    "/readyz/poststarthook/crd-informer-synced",
    "/readyz/poststarthook/generic-apiserver-start-informers",
    "/readyz/poststarthook/kube-apiserver-autoregistration",
    "/readyz/poststarthook/rbac/bootstrap-roles",
    "/readyz/poststarthook/scheduling/bootstrap-system-priority-classes",
    "/readyz/poststarthook/start-apiextensions-controllers",
    "/readyz/poststarthook/start-apiextensions-informers",
    "/readyz/poststarthook/start-cluster-authentication-info-controller",
    "/readyz/poststarthook/start-kube-aggregator-informers",
    "/readyz/poststarthook/start-kube-apiserver-admission-initializer",
    "/readyz/shutdown",
    "/version"
  ]
}

参考：

解决k8s访问报anonymous cannot get path的问题

获取k8s集群信息kubectl cluster-info

1. 查看集群信息

2. 问题处理

3. 问题验证

获取k8s集群信息`kubectl cluster-info`