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  49. <div class="md-header__ellipsis">
  50. <div class="md-header__topic">
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  52. External Secrets Operator
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  55. <div class="md-header__topic" data-md-component="header-topic">
  56. <span class="md-ellipsis">
  57. Overview
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  115. External Secrets Operator
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  123. External Secrets Operator
  124. </div>
  125. </a>
  126. </div>
  127. <ul class="md-nav__list" data-md-scrollfix>
  128. <li class="md-nav__item">
  129. <a href=".." class="md-nav__link">
  130. Introduction
  131. </a>
  132. </li>
  133. <li class="md-nav__item md-nav__item--active">
  134. <input class="md-nav__toggle md-toggle" data-md-toggle="toc" type="checkbox" id="__toc">
  135. <label class="md-nav__link md-nav__link--active" for="__toc">
  136. Overview
  137. <span class="md-nav__icon md-icon"></span>
  138. </label>
  139. <a href="./" class="md-nav__link md-nav__link--active">
  140. Overview
  141. </a>
  142. <nav class="md-nav md-nav--secondary" aria-label="Table of contents">
  143. <label class="md-nav__title" for="__toc">
  144. <span class="md-nav__icon md-icon"></span>
  145. Table of contents
  146. </label>
  147. <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
  148. <li class="md-nav__item">
  149. <a href="#architecture" class="md-nav__link">
  150. Architecture
  151. </a>
  152. </li>
  153. <li class="md-nav__item">
  154. <a href="#resource-model" class="md-nav__link">
  155. Resource model
  156. </a>
  157. <nav class="md-nav" aria-label="Resource model">
  158. <ul class="md-nav__list">
  159. <li class="md-nav__item">
  160. <a href="#secretstore" class="md-nav__link">
  161. SecretStore
  162. </a>
  163. </li>
  164. <li class="md-nav__item">
  165. <a href="#externalsecret" class="md-nav__link">
  166. ExternalSecret
  167. </a>
  168. </li>
  169. <li class="md-nav__item">
  170. <a href="#clustersecretstore" class="md-nav__link">
  171. ClusterSecretStore
  172. </a>
  173. </li>
  174. </ul>
  175. </nav>
  176. </li>
  177. <li class="md-nav__item">
  178. <a href="#behavior" class="md-nav__link">
  179. Behavior
  180. </a>
  181. </li>
  182. <li class="md-nav__item">
  183. <a href="#roles-and-responsibilities" class="md-nav__link">
  184. Roles and responsibilities
  185. </a>
  186. </li>
  187. <li class="md-nav__item">
  188. <a href="#access-control" class="md-nav__link">
  189. Access Control
  190. </a>
  191. </li>
  192. <li class="md-nav__item">
  193. <a href="#running-multiple-controller" class="md-nav__link">
  194. Running multiple Controller
  195. </a>
  196. </li>
  197. </ul>
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  199. </li>
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  201. <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_3" type="checkbox" id="__nav_3" >
  202. <label class="md-nav__link" for="__nav_3">
  203. API Types
  204. <span class="md-nav__icon md-icon"></span>
  205. </label>
  206. <nav class="md-nav" aria-label="API Types" data-md-level="1">
  207. <label class="md-nav__title" for="__nav_3">
  208. <span class="md-nav__icon md-icon"></span>
  209. API Types
  210. </label>
  211. <ul class="md-nav__list" data-md-scrollfix>
  212. <li class="md-nav__item">
  213. <a href="../api-externalsecret/" class="md-nav__link">
  214. ExternalSecret
  215. </a>
  216. </li>
  217. <li class="md-nav__item">
  218. <a href="../api-secretstore/" class="md-nav__link">
  219. SecretStore
  220. </a>
  221. </li>
  222. <li class="md-nav__item">
  223. <a href="../api-clustersecretstore/" class="md-nav__link">
  224. ClusterSecretStore
  225. </a>
  226. </li>
  227. </ul>
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  233. Guides
  234. <span class="md-nav__icon md-icon"></span>
  235. </label>
  236. <nav class="md-nav" aria-label="Guides" data-md-level="1">
  237. <label class="md-nav__title" for="__nav_4">
  238. <span class="md-nav__icon md-icon"></span>
  239. Guides
  240. </label>
  241. <ul class="md-nav__list" data-md-scrollfix>
  242. <li class="md-nav__item">
  243. <a href="../guides-introduction/" class="md-nav__link">
  244. Introduction
  245. </a>
  246. </li>
  247. <li class="md-nav__item">
  248. <a href="../guides-getting-started/" class="md-nav__link">
  249. Getting started
  250. </a>
  251. </li>
  252. <li class="md-nav__item">
  253. <a href="../guides-templating/" class="md-nav__link">
  254. Advanced Templating
  255. </a>
  256. </li>
  257. <li class="md-nav__item">
  258. <a href="../guides-controller-class/" class="md-nav__link">
  259. Controller Classes
  260. </a>
  261. </li>
  262. <li class="md-nav__item">
  263. <a href="../guides-all-keys-one-secret/" class="md-nav__link">
  264. All keys, One secret
  265. </a>
  266. </li>
  267. <li class="md-nav__item">
  268. <a href="../guides-common-k8s-secret-types/" class="md-nav__link">
  269. Common K8S Secret Types
  270. </a>
  271. </li>
  272. <li class="md-nav__item">
  273. <a href="../guides-multi-tenancy/" class="md-nav__link">
  274. Multi Tenancy
  275. </a>
  276. </li>
  277. <li class="md-nav__item">
  278. <a href="../guides-metrics/" class="md-nav__link">
  279. Metrics
  280. </a>
  281. </li>
  282. <li class="md-nav__item">
  283. <a href="../guides-using-latest-image/" class="md-nav__link">
  284. Using Latest Image
  285. </a>
  286. </li>
  287. <li class="md-nav__item">
  288. <a href="../guides-gitops-using-fluxcd/" class="md-nav__link">
  289. GitOps using FluxCD
  290. </a>
  291. </li>
  292. </ul>
  293. </nav>
  294. </li>
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  541. Architecture
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  552. SecretStore
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  557. ExternalSecret
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  562. ClusterSecretStore
  563. </a>
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  569. <a href="#behavior" class="md-nav__link">
  570. Behavior
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  580. Access Control
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  585. Running multiple Controller
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  593. <div class="md-content" data-md-component="content">
  594. <article class="md-content__inner md-typeset">
  595. <a href="https://github.com/external-secrets/external-secrets/edit/master/docs/api-overview.md" title="Edit this page" class="md-content__button md-icon">
  596. <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25z"/></svg>
  597. </a>
  598. <h1 id="api-overview">API Overview</h1>
  599. <h2 id="architecture">Architecture</h2>
  600. <p><img alt="high-level" src="../pictures/diagrams-high-level-simple.png" /></p>
  601. <p>The External Secrets Operator extends Kubernetes with <a href="https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/">Custom
  602. Resources</a>,
  603. which define where secrets live and how to synchronize them. The controller
  604. fetches secrets from an external API and creates Kubernetes
  605. <a href="https://kubernetes.io/docs/concepts/configuration/secret/">secrets</a>. If the
  606. secret from the external API changes, the controller will reconcile the state in
  607. the cluster and update the secrets accordingly.</p>
  608. <h2 id="resource-model">Resource model</h2>
  609. <p>To understand the mechanics of the operator let's start with the data model. The
  610. SecretStore references an bucket of key/value pairs. But because every external
  611. API is slightly different this bucket may be e.g. an instance of an Azure
  612. KeyVault or a AWS Secrets Manager in a certain AWS Account and region. Please
  613. take a look at the provider documentation to see what the Bucket actually maps
  614. to.</p>
  615. <p><img alt="Resource Mapping" src="../pictures/diagrams-resource-mapping.png" /></p>
  616. <h3 id="secretstore">SecretStore</h3>
  617. <p>The idea behind the <a href="../api-secretstore/">SecretStore</a> resource is to separate concerns of
  618. authentication/access and the actual Secret and configuration needed for
  619. workloads. The ExternalSecret specifies what to fetch, the SecretStore specifies
  620. how to access. This resource is namespaced.</p>
  621. <p><div class="highlight"><pre><span></span><code><span class="nt">apiVersion</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">external-secrets.io/v1alpha1</span>
  622. <span class="nt">kind</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">SecretStore</span>
  623. <span class="nt">metadata</span><span class="p">:</span>
  624. <span class="nt">name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">secretstore-sample</span>
  625. <span class="nt">spec</span><span class="p">:</span>
  626. <span class="nt">provider</span><span class="p">:</span>
  627. <span class="nt">aws</span><span class="p">:</span>
  628. <span class="nt">service</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">SecretsManager</span>
  629. <span class="nt">region</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">us-east-1</span>
  630. <span class="nt">auth</span><span class="p">:</span>
  631. <span class="nt">secretRef</span><span class="p">:</span>
  632. <span class="nt">accessKeyIDSecretRef</span><span class="p">:</span>
  633. <span class="nt">name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">awssm-secret</span>
  634. <span class="nt">key</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">access-key</span>
  635. <span class="nt">secretAccessKeySecretRef</span><span class="p">:</span>
  636. <span class="nt">name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">awssm-secret</span>
  637. <span class="nt">key</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">secret-access-key</span>
  638. </code></pre></div>
  639. The <code>SecretStore</code> contains references to secrets which hold credentials to
  640. access the external API.</p>
  641. <h3 id="externalsecret">ExternalSecret</h3>
  642. <p>An <a href="../api-externalsecret/">ExternalSecret</a> declares what data to fetch. It has a reference to a
  643. <code>SecretStore</code> which knows how to access that data. The controller uses that
  644. <code>ExternalSecret</code> as a blueprint to create secrets.</p>
  645. <div class="highlight"><pre><span></span><code><span class="nt">apiVersion</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">external-secrets.io/v1alpha1</span>
  646. <span class="nt">kind</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">ExternalSecret</span>
  647. <span class="nt">metadata</span><span class="p">:</span>
  648. <span class="nt">name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">example</span>
  649. <span class="nt">spec</span><span class="p">:</span>
  650. <span class="nt">refreshInterval</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">1h</span>
  651. <span class="nt">secretStoreRef</span><span class="p">:</span>
  652. <span class="nt">name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">secretstore-sample</span>
  653. <span class="nt">kind</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">SecretStore</span>
  654. <span class="nt">target</span><span class="p">:</span>
  655. <span class="nt">name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">secret-to-be-created</span>
  656. <span class="nt">creationPolicy</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">Owner</span>
  657. <span class="nt">data</span><span class="p">:</span>
  658. <span class="p p-Indicator">-</span> <span class="nt">secretKey</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">secret-key-to-be-managed</span>
  659. <span class="nt">remoteRef</span><span class="p">:</span>
  660. <span class="nt">key</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">provider-key</span>
  661. <span class="nt">version</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">provider-key-version</span>
  662. <span class="nt">property</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">provider-key-property</span>
  663. <span class="nt">dataFrom</span><span class="p">:</span>
  664. <span class="p p-Indicator">-</span> <span class="nt">key</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">remote-key-in-the-provider</span>
  665. </code></pre></div>
  666. <h3 id="clustersecretstore">ClusterSecretStore</h3>
  667. <p>The <a href="../api-clustersecretstore/">ClusterSecretStore</a> is a global, cluster-wide SecretStore that can be
  668. referenced from all namespaces. You can use it to provide a central gateway to your secret provider.</p>
  669. <h2 id="behavior">Behavior</h2>
  670. <p>The External Secret Operator (ESO for brevity) reconciles <code>ExternalSecrets</code> in
  671. the following manner:</p>
  672. <ol>
  673. <li>ESO uses <code>spec.secretStoreRef</code> to find an appropriate <code>SecretStore</code>. If it
  674. doesn't exist or the <code>spec.controller</code> field doesn't match it won't further
  675. process this ExternalSecret.</li>
  676. <li>ESO instanciates an external API client using the specified credentials from
  677. the <code>SecretStore</code> spec.</li>
  678. <li>ESO fetches the secrets as requested by the <code>ExternalSecret</code>, it will decode
  679. the secrets if required</li>
  680. <li>ESO creates an <code>Kind=Secret</code> based on the template provided by
  681. <code>ExternalSecret.target.template</code>. The <code>Secret.data</code> can be templated using
  682. the secret values from the external API.</li>
  683. <li>ESO ensures that the secret values stay in sync with the external API</li>
  684. </ol>
  685. <h2 id="roles-and-responsibilities">Roles and responsibilities</h2>
  686. <p>The External Secret Operator is designed to target the following persona:</p>
  687. <ul>
  688. <li><strong>Cluster Operator</strong>: The cluster operator is responsible for setting up the
  689. External Secret Operator, managing access policies and creating
  690. ClusterSecretStores.</li>
  691. <li><strong>Application developer</strong>: The Application developer is responsible for
  692. defining ExternalSecrets and the application configuration</li>
  693. </ul>
  694. <p>Each persona will roughly map to a Kubernetes RBAC role. Depending on your
  695. environment these roles can map to a single user. <strong>Note:</strong> There is no Secret
  696. Operator that handles the lifecycle of the secret, this is out of the scope of
  697. ESO.</p>
  698. <h2 id="access-control">Access Control</h2>
  699. <p>The External Secrets Operator runs as a deployment in your cluster with elevated
  700. privileges. It will create/read/update secrets in all namespaces and has access
  701. to secrets stored in some external API. Ensure that the credentials you provide
  702. give ESO the least privilege necessary.</p>
  703. <p>Design your <code>SecretStore</code>/<code>ClusterSecretStore</code> carefully! Be sure to restrict
  704. access of application developers to read only certain
  705. keys in a shared environment.</p>
  706. <p>You should also consider using Kubernetes' admission control system (e.g.
  707. <a href="https://www.openpolicyagent.org/">OPA</a> or <a href="https://kyverno.io/">Kyverno</a>) for
  708. fine-grained access control.</p>
  709. <h2 id="running-multiple-controller">Running multiple Controller</h2>
  710. <p>You can run multiple controller within the cluster. One controller can be
  711. limited to only process <code>SecretStores</code> with a predefined <code>spec.controller</code>
  712. field.</p>
  713. <div class="admonition note">
  714. <p class="admonition-title">Testers welcome</p>
  715. <p>This is not widely tested. Please help us test the setup and/or document use-cases.</p>
  716. </div>
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