k8s用ServiceAccount Token的方式访问apiserver

admin管理员组

文章数量:1648379

在kubernetes集群，可以登陆到master集群，可以使用私钥证书的方式访问。证书路径：master的/etc/kubernetes/pki/(ca.crt / apiserver.crt / apiserver.key) 下面。

# server是apiserver公网访问地址
curl --cacert ca.crt --cert apiserver.crt --key apiserver.key https://$server/api

这里再介绍一下使用ServiceAccount Token的方式访问集群。
serviceaccount的权限由集群中对应的rolebinding决定，官方文档:
https://kubernetes.io/docs/reference/access-authn-authz/rbac

请选择对应权限的ServiceAccount来获取token，这边选择的是admin ServiceAccount
kubectl get sa admin -n kube-system -o yaml

查看对应的clusterrolebinding：
kubectl get clusterrolebinding admin -o yaml


查看admin sa绑定的clusterrole和对应的权限。命令：
kubectl get clusterrole admin -o yaml


获取对应sa的secret从中获取token。并进行base64解码。
kubectl get secret admin-token-5tctj -n kube-system -o jsonpath={".data.token"} | base64 -d

最后使用该token访问apiserver：

最后使用公网slb地址访问。curl -k -H 'Authorization: Bearer token' https://111.111.111.111:6443

例如：
 

# curl -k -H 'Authorization: Bearer hbGciOiJSUzI1NiIsImtpZCI6Ilg3RHRVOEZZdW0zVmZLV0JZeGlfVjJSTG1TQ1A3LWRPX0w1SUVvdldEWkkifQ.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJrdWJlLXN5c3RlbSIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VjcmV0Lm5hbWUiOiJkZWZhdWx0LXRva2VuLXBycjJsIiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9zZXJ2aWNlLWFjY291bnQubmFtZSI6ImRlZmF1bHQiLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2VhY2NvdW50L3NlcnZpY2UtYWNjb3VudC51aWQiOiIxN2U3NjAxMi1lYTE5LTRkNDktODM1NS0zMmQ4OGIzY2Y2YWEiLCJzdWIiOiJzeXN0ZW06c2VydmljZWFjY291bnQ6a3ViZS1zeXN0ZW06ZGVmYXVsdCJ9.dLNfDTlxoEAMw115yT4NPsOgRcN1rOp9rCZYj9mAzbfKX3L1LNzLlCAYgcBjWdro5u-8NncOyWp9--vAyADq7yaa0T-tBfVALg8dESuwSQpSN-I5YOh7G8ua81HFjWFWX6dvq1GW2fbHPeXCJDlkBnJAbTGLb-487lbK0VWkSdLl1tsT435eZS5e6rRNIWAJJizVBrxDliND_7IXE6zILOR5u-A3z3wk3ngCv4e2FLNOR6z4qr2l-xyQG3pLXH2YQt_TjCkaR9kg57CRQRpwSiN6DfMfeq_qwI7d_iCawNSbLEBWRPEjA3j4juE64CcrA1fr58LIFxEr_ga949XgWw' https://10.182.101.255:6443/api/v1/namespaces

# curl -k -H 'Authorization: Bearer hbGciOiJSUzI1NiIsImtpZCI6Ilg3RHRVOEZZdW0zVmZLV0JZeGlfVjJSTG1TQ1A3LWRPX0w1SUVvdldEWkkifQ.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJrdWJlLXN5c3RlbSIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VjcmV0Lm5hbWUiOiJkZWZhdWx0LXRva2VuLXBycjJsIiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9zZXJ2aWNlLWFjY291bnQubmFtZSI6ImRlZmF1bHQiLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2VhY2NvdW50L3NlcnZpY2UtYWNjb3VudC51aWQiOiIxN2U3NjAxMi1lYTE5LTRkNDktODM1NS0zMmQ4OGIzY2Y2YWEiLCJzdWIiOiJzeXN0ZW06c2VydmljZWFjY291bnQ6a3ViZS1zeXN0ZW06ZGVmYXVsdCJ9.dLNfDTlxoEAMw115yT4NPsOgRcN1rOp9rCZYj9mAzbfKX3L1LNzLlCAYgcBjWdro5u-8NncOyWp9--vAyADq7yaa0T-tBfVALg8dESuwSQpSN-I5YOh7G8ua81HFjWFWX6dvq1GW2fbHPeXCJDlkBnJAbTGLb-487lbK0VWkSdLl1tsT435eZS5e6rRNIWAJJizVBrxDliND_7IXE6zILOR5u-A3z3wk3ngCv4e2FLNOR6z4qr2l-xyQG3pLXH2YQt_TjCkaR9kg57CRQRpwSiN6DfMfeq_qwI7d_iCawNSbLEBWRPEjA3j4juE64CcrA1fr58LIFxEr_ga949XgWw' https://10.182.101.255:6443/api
{
  "kind": "APIVersions",
  "versions": [
    "v1"
  ],
  "serverAddressByClientCIDRs": [
    {
      "clientCIDR": "0.0.0.0/0",
      "serverAddress": "172.20.8.14:6443"
    }
  ]
}

本文标签： 方式ServiceAccountK8sAPIServerToken