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Role Based Access Control (RBAC)
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<a href="https://github.com/kubernetes/ingress-nginx/edit/master/docs/deploy/rbac.md" title="Edit this page" class="md-icon md-content__icon"></a>
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<h1 id="role-based-access-control-rbac">Role Based Access Control (RBAC)<a class="headerlink" href="#role-based-access-control-rbac" title="Permanent link"> ¶</a></h1>
|
|
<h2 id="overview">Overview<a class="headerlink" href="#overview" title="Permanent link"> ¶</a></h2>
|
|
<p>This example applies to nginx-ingress-controllers being deployed in an environment with RBAC enabled.</p>
|
|
<p>Role Based Access Control is comprised of four layers:</p>
|
|
<ol>
|
|
<li><code class="codehilite"><span class="err">ClusterRole</span></code> - permissions assigned to a role that apply to an entire cluster</li>
|
|
<li><code class="codehilite"><span class="err">ClusterRoleBinding</span></code> - binding a ClusterRole to a specific account</li>
|
|
<li><code class="codehilite"><span class="err">Role</span></code> - permissions assigned to a role that apply to a specific namespace</li>
|
|
<li><code class="codehilite"><span class="err">RoleBinding</span></code> - binding a Role to a specific account</li>
|
|
</ol>
|
|
<p>In order for RBAC to be applied to an nginx-ingress-controller, that controller
|
|
should be assigned to a <code class="codehilite"><span class="err">ServiceAccount</span></code>. That <code class="codehilite"><span class="err">ServiceAccount</span></code> should be
|
|
bound to the <code class="codehilite"><span class="err">Role</span></code>s and <code class="codehilite"><span class="err">ClusterRole</span></code>s defined for the nginx-ingress-controller.</p>
|
|
<h2 id="service-accounts-created-in-this-example">Service Accounts created in this example<a class="headerlink" href="#service-accounts-created-in-this-example" title="Permanent link"> ¶</a></h2>
|
|
<p>One ServiceAccount is created in this example, <code class="codehilite"><span class="err">nginx-ingress-serviceaccount</span></code>.</p>
|
|
<h2 id="permissions-granted-in-this-example">Permissions Granted in this example<a class="headerlink" href="#permissions-granted-in-this-example" title="Permanent link"> ¶</a></h2>
|
|
<p>There are two sets of permissions defined in this example. Cluster-wide
|
|
permissions defined by the <code class="codehilite"><span class="err">ClusterRole</span></code> named <code class="codehilite"><span class="err">nginx-ingress-clusterrole</span></code>, and
|
|
namespace specific permissions defined by the <code class="codehilite"><span class="err">Role</span></code> named <code class="codehilite"><span class="err">nginx-ingress-role</span></code>.</p>
|
|
<h3 id="cluster-permissions">Cluster Permissions<a class="headerlink" href="#cluster-permissions" title="Permanent link"> ¶</a></h3>
|
|
<p>These permissions are granted in order for the nginx-ingress-controller to be
|
|
able to function as an ingress across the cluster. These permissions are
|
|
granted to the ClusterRole named <code class="codehilite"><span class="err">nginx-ingress-clusterrole</span></code></p>
|
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<ul>
|
|
<li><code class="codehilite"><span class="err">configmaps</span></code>, <code class="codehilite"><span class="err">endpoints</span></code>, <code class="codehilite"><span class="err">nodes</span></code>, <code class="codehilite"><span class="err">pods</span></code>, <code class="codehilite"><span class="err">secrets</span></code>: list, watch</li>
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<li><code class="codehilite"><span class="err">nodes</span></code>: get</li>
|
|
<li><code class="codehilite"><span class="err">services</span></code>, <code class="codehilite"><span class="err">ingresses</span></code>: get, list, watch</li>
|
|
<li><code class="codehilite"><span class="err">events</span></code>: create, patch</li>
|
|
<li><code class="codehilite"><span class="err">ingresses/status</span></code>: update</li>
|
|
</ul>
|
|
<h3 id="namespace-permissions">Namespace Permissions<a class="headerlink" href="#namespace-permissions" title="Permanent link"> ¶</a></h3>
|
|
<p>These permissions are granted specific to the nginx-ingress namespace. These
|
|
permissions are granted to the Role named <code class="codehilite"><span class="err">nginx-ingress-role</span></code></p>
|
|
<ul>
|
|
<li><code class="codehilite"><span class="err">configmaps</span></code>, <code class="codehilite"><span class="err">pods</span></code>, <code class="codehilite"><span class="err">secrets</span></code>: get</li>
|
|
<li><code class="codehilite"><span class="err">endpoints</span></code>: get</li>
|
|
</ul>
|
|
<p>Furthermore to support leader-election, the nginx-ingress-controller needs to
|
|
have access to a <code class="codehilite"><span class="err">configmap</span></code> using the resourceName <code class="codehilite"><span class="err">ingress-controller-leader-nginx</span></code></p>
|
|
<blockquote>
|
|
<p>Note that resourceNames can NOT be used to limit requests using the “create”
|
|
verb because authorizers only have access to information that can be obtained
|
|
from the request URL, method, and headers (resource names in a “create” request
|
|
are part of the request body).</p>
|
|
</blockquote>
|
|
<ul>
|
|
<li><code class="codehilite"><span class="err">configmaps</span></code>: get, update (for resourceName <code class="codehilite"><span class="err">ingress-controller-leader-nginx</span></code>)</li>
|
|
<li><code class="codehilite"><span class="err">configmaps</span></code>: create</li>
|
|
</ul>
|
|
<p>This resourceName is the concatenation of the <code class="codehilite"><span class="err">election-id</span></code> and the
|
|
<code class="codehilite"><span class="err">ingress-class</span></code> as defined by the ingress-controller, which defaults to:</p>
|
|
<ul>
|
|
<li><code class="codehilite"><span class="err">election-id</span></code>: <code class="codehilite"><span class="err">ingress-controller-leader</span></code></li>
|
|
<li><code class="codehilite"><span class="err">ingress-class</span></code>: <code class="codehilite"><span class="err">nginx</span></code></li>
|
|
<li><code class="codehilite"><span class="err">resourceName</span></code> : <code class="codehilite"><span class="err"><election-id>-<ingress-class></span></code></li>
|
|
</ul>
|
|
<p>Please adapt accordingly if you overwrite either parameter when launching the
|
|
nginx-ingress-controller.</p>
|
|
<h3 id="bindings">Bindings<a class="headerlink" href="#bindings" title="Permanent link"> ¶</a></h3>
|
|
<p>The ServiceAccount <code class="codehilite"><span class="err">nginx-ingress-serviceaccount</span></code> is bound to the Role
|
|
<code class="codehilite"><span class="err">nginx-ingress-role</span></code> and the ClusterRole <code class="codehilite"><span class="err">nginx-ingress-clusterrole</span></code>.</p>
|
|
<p>The serviceAccountName associated with the containers in the deployment must
|
|
match the serviceAccount. The namespace references in the Deployment metadata,
|
|
container arguments, and POD_NAMESPACE should be in the nginx-ingress namespace.</p>
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