From a1dededa56d75a1919c6af33377946ef03f48eda Mon Sep 17 00:00:00 2001 From: Jimmy Cuadra <jimmy@jimmycuadra.com> Date: Wed, 14 Dec 2016 15:52:22 -0800 Subject: [PATCH] Fix the formatting of bullet lists on the kubelet auth page. --- .../kubelet-authentication-authorization.md | 36 +++++++++++-------- 1 file changed, 21 insertions(+), 15 deletions(-) diff --git a/docs/admin/kubelet-authentication-authorization.md b/docs/admin/kubelet-authentication-authorization.md index b0617b8854..509792bf24 100644 --- a/docs/admin/kubelet-authentication-authorization.md +++ b/docs/admin/kubelet-authentication-authorization.md @@ -17,35 +17,40 @@ This document describes how to authenticate and authorize access to the kubelet' ## Kubelet authentication By default, requests to the kubelet's HTTPS endpoint that are not rejected by other configured -authentication methods are treated as anonymous requests, and given a username of `system:anonymous` +authentication methods are treated as anonymous requests, and given a username of `system:anonymous` and a group of `system:unauthenticated`. To disable anonymous access and send `401 Unauthorized` responses to unauthenticated requests: + * start the kubelet with the `--anonymous-auth=false` flag To enable X509 client certificate authentication to the kubelet's HTTPS endpoint: -* start the kubelet with the `--client-ca-file` flag, providing a CA bundle to verify client certificates with + +* start the kubelet with the `--client-ca-file` flag, providing a CA bundle to verify client certificates with * start the apiserver with `--kubelet-client-certificate` and `--kubelet-client-key` flags * see the [apiserver authentication documentation](/docs/admin/authentication/#x509-client-certs) for more details To enable API bearer tokens (including service account tokens) to be used to authenticate to the kubelet's HTTPS endpoint: + * ensure the `authentication.k8s.io/v1beta1` API group is enabled in the API server * start the kubelet with the `--authentication-token-webhook`, `--kubeconfig`, and `--require-kubeconfig` flags -* the kubelet calls the `TokenReview` API on the configured API server to determine user information from bearer tokens +* the kubelet calls the `TokenReview` API on the configured API server to determine user information from bearer tokens ## Kubelet authorization Any request that is successfully authenticated (including an anonymous request) is then authorized. The default authorization mode is `AlwaysAllow`, which allows all requests. There are many possible reasons to subdivide access to the kubelet API: + * anonymous auth is enabled, but anonymous users' ability to call the kubelet API should be limited * bearer token auth is enabled, but arbitrary API users' (like service accounts) ability to call the kubelet API should be limited * client certificate auth is enabled, but only some of the client certificates signed by the configured CA should be allowed to use the kubelet API To subdivide access to the kubelet API, delegate authorization to the API server: + * ensure the `authorization.k8s.io/v1beta1` API group is enabled in the API server * start the kubelet with the `--authorization-mode=Webhook`, `--kubeconfig`, and `--require-kubeconfig` flags -* the kubelet calls the `SubjectAccessReview` API on the configured API server to determine whether each request is authorized +* the kubelet calls the `SubjectAccessReview` API on the configured API server to determine whether each request is authorized The kubelet authorizes API requests using the same [request attributes](/docs/admin/authorization/#request-attributes) approach as the apiserver. @@ -63,19 +68,20 @@ The resource and subresource is determined from the incoming request's path: Kubelet API | resource | subresource -------------|----------|------------ -/stats/* | nodes | stats -/metrics/* | nodes | metrics -/logs/* | nodes | log -/spec/* | nodes | spec +/stats/\* | nodes | stats +/metrics/\* | nodes | metrics +/logs/\* | nodes | log +/spec/\* | nodes | spec *all others* | nodes | proxy -The namespace and API group attributes are always an empty string, and +The namespace and API group attributes are always an empty string, and the resource name is always the name of the kubelet's `Node` API object. -When running in this mode, ensure the user identified by the `--kubelet-client-certificate` and `--kubelet-client-key` +When running in this mode, ensure the user identified by the `--kubelet-client-certificate` and `--kubelet-client-key` flags passed to the apiserver is authorized for the following attributes: -* verb=*, resource=nodes, subresource=proxy -* verb=*, resource=nodes, subresource=stats -* verb=*, resource=nodes, subresource=log -* verb=*, resource=nodes, subresource=spec -* verb=*, resource=nodes, subresource=metrics + +* verb=\*, resource=nodes, subresource=proxy +* verb=\*, resource=nodes, subresource=stats +* verb=\*, resource=nodes, subresource=log +* verb=\*, resource=nodes, subresource=spec +* verb=\*, resource=nodes, subresource=metrics