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  49. <div class="md-header__ellipsis">
  50. <div class="md-header__topic">
  51. <span class="md-ellipsis">
  52. External Secrets Operator
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  54. </div>
  55. <div class="md-header__topic" data-md-component="header-topic">
  56. <span class="md-ellipsis">
  57. Overview
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  84. Initializing search
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  115. External Secrets Operator
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  117. <div class="md-nav__source">
  118. <a href="https://github.com/external-secrets/external-secrets/" title="Go to repository" class="md-source" data-md-component="source">
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  122. <div class="md-source__repository">
  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>
  198. </nav>
  199. </li>
  200. <li class="md-nav__item md-nav__item--nested">
  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. <li class="md-nav__item">
  228. <a href="../api-clusterexternalsecret/" class="md-nav__link">
  229. ClusterExternalSecret
  230. </a>
  231. </li>
  232. </ul>
  233. </nav>
  234. </li>
  235. <li class="md-nav__item md-nav__item--nested">
  236. <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_4" type="checkbox" id="__nav_4" >
  237. <label class="md-nav__link" for="__nav_4">
  238. Guides
  239. <span class="md-nav__icon md-icon"></span>
  240. </label>
  241. <nav class="md-nav" aria-label="Guides" data-md-level="1">
  242. <label class="md-nav__title" for="__nav_4">
  243. <span class="md-nav__icon md-icon"></span>
  244. Guides
  245. </label>
  246. <ul class="md-nav__list" data-md-scrollfix>
  247. <li class="md-nav__item">
  248. <a href="../guides-introduction/" class="md-nav__link">
  249. Introduction
  250. </a>
  251. </li>
  252. <li class="md-nav__item">
  253. <a href="../guides-getting-started/" class="md-nav__link">
  254. Getting started
  255. </a>
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  656. Architecture
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  664. <ul class="md-nav__list">
  665. <li class="md-nav__item">
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  667. SecretStore
  668. </a>
  669. </li>
  670. <li class="md-nav__item">
  671. <a href="#externalsecret" class="md-nav__link">
  672. ExternalSecret
  673. </a>
  674. </li>
  675. <li class="md-nav__item">
  676. <a href="#clustersecretstore" class="md-nav__link">
  677. ClusterSecretStore
  678. </a>
  679. </li>
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  708. <div class="md-content" data-md-component="content">
  709. <article class="md-content__inner md-typeset">
  710. <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">
  711. <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>
  712. </a>
  713. <h1 id="api-overview">API Overview</h1>
  714. <h2 id="architecture">Architecture</h2>
  715. <p><img alt="high-level" src="../pictures/diagrams-high-level-simple.png" /></p>
  716. <p>The External Secrets Operator extends Kubernetes with <a href="https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/">Custom
  717. Resources</a>,
  718. which define where secrets live and how to synchronize them. The controller
  719. fetches secrets from an external API and creates Kubernetes
  720. <a href="https://kubernetes.io/docs/concepts/configuration/secret/">secrets</a>. If the
  721. secret from the external API changes, the controller will reconcile the state in
  722. the cluster and update the secrets accordingly.</p>
  723. <h2 id="resource-model">Resource model</h2>
  724. <p>To understand the mechanics of the operator let's start with the data model. The
  725. SecretStore references an bucket of key/value pairs. But because every external
  726. API is slightly different this bucket may be e.g. an instance of an Azure
  727. KeyVault or a AWS Secrets Manager in a certain AWS Account and region. Please
  728. take a look at the provider documentation to see what the Bucket actually maps
  729. to.</p>
  730. <p><img alt="Resource Mapping" src="../pictures/diagrams-resource-mapping.png" /></p>
  731. <h3 id="secretstore">SecretStore</h3>
  732. <p>The idea behind the <a href="../api-secretstore/">SecretStore</a> resource is to separate concerns of
  733. authentication/access and the actual Secret and configuration needed for
  734. workloads. The ExternalSecret specifies what to fetch, the SecretStore specifies
  735. how to access. This resource is namespaced.</p>
  736. <p><div class="highlight"><pre><span></span><code><span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">external-secrets.io/v1beta1</span><span class="w"></span>
  737. <span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">SecretStore</span><span class="w"></span>
  738. <span class="nt">metadata</span><span class="p">:</span><span class="w"></span>
  739. <span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">secretstore-sample</span><span class="w"></span>
  740. <span class="nt">spec</span><span class="p">:</span><span class="w"></span>
  741. <span class="w"> </span><span class="nt">provider</span><span class="p">:</span><span class="w"></span>
  742. <span class="w"> </span><span class="nt">aws</span><span class="p">:</span><span class="w"></span>
  743. <span class="w"> </span><span class="nt">service</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">SecretsManager</span><span class="w"></span>
  744. <span class="w"> </span><span class="nt">region</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">us-east-1</span><span class="w"></span>
  745. <span class="w"> </span><span class="nt">auth</span><span class="p">:</span><span class="w"></span>
  746. <span class="w"> </span><span class="nt">secretRef</span><span class="p">:</span><span class="w"></span>
  747. <span class="w"> </span><span class="nt">accessKeyIDSecretRef</span><span class="p">:</span><span class="w"></span>
  748. <span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">awssm-secret</span><span class="w"></span>
  749. <span class="w"> </span><span class="nt">key</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">access-key</span><span class="w"></span>
  750. <span class="w"> </span><span class="nt">secretAccessKeySecretRef</span><span class="p">:</span><span class="w"></span>
  751. <span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">awssm-secret</span><span class="w"></span>
  752. <span class="w"> </span><span class="nt">key</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">secret-access-key</span><span class="w"></span>
  753. </code></pre></div>
  754. The <code>SecretStore</code> contains references to secrets which hold credentials to
  755. access the external API.</p>
  756. <h3 id="externalsecret">ExternalSecret</h3>
  757. <p>An <a href="../api-externalsecret/">ExternalSecret</a> declares what data to fetch. It has a reference to a
  758. <code>SecretStore</code> which knows how to access that data. The controller uses that
  759. <code>ExternalSecret</code> as a blueprint to create secrets.</p>
  760. <div class="highlight"><pre><span></span><code><span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">external-secrets.io/v1beta1</span><span class="w"></span>
  761. <span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ExternalSecret</span><span class="w"></span>
  762. <span class="nt">metadata</span><span class="p">:</span><span class="w"></span>
  763. <span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">example</span><span class="w"></span>
  764. <span class="nt">spec</span><span class="p">:</span><span class="w"></span>
  765. <span class="w"> </span><span class="nt">refreshInterval</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1h</span><span class="w"></span>
  766. <span class="w"> </span><span class="nt">secretStoreRef</span><span class="p">:</span><span class="w"></span>
  767. <span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">secretstore-sample</span><span class="w"></span>
  768. <span class="w"> </span><span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">SecretStore</span><span class="w"></span>
  769. <span class="w"> </span><span class="nt">target</span><span class="p">:</span><span class="w"></span>
  770. <span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">secret-to-be-created</span><span class="w"></span>
  771. <span class="w"> </span><span class="nt">creationPolicy</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Owner</span><span class="w"></span>
  772. <span class="w"> </span><span class="nt">data</span><span class="p">:</span><span class="w"></span>
  773. <span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">secretKey</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">secret-key-to-be-managed</span><span class="w"></span>
  774. <span class="w"> </span><span class="nt">remoteRef</span><span class="p">:</span><span class="w"></span>
  775. <span class="w"> </span><span class="nt">key</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">provider-key</span><span class="w"></span>
  776. <span class="w"> </span><span class="nt">version</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">provider-key-version</span><span class="w"></span>
  777. <span class="w"> </span><span class="nt">property</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">provider-key-property</span><span class="w"></span>
  778. <span class="w"> </span><span class="nt">dataFrom</span><span class="p">:</span><span class="w"></span>
  779. <span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">extract</span><span class="p">:</span><span class="w"></span>
  780. <span class="w"> </span><span class="nt">key</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">remote-key-in-the-provider</span><span class="w"></span>
  781. </code></pre></div>
  782. <h3 id="clustersecretstore">ClusterSecretStore</h3>
  783. <p>The <a href="../api-clustersecretstore/">ClusterSecretStore</a> is a global, cluster-wide SecretStore that can be
  784. referenced from all namespaces. You can use it to provide a central gateway to your secret provider.</p>
  785. <h2 id="behavior">Behavior</h2>
  786. <p>The External Secret Operator (ESO for brevity) reconciles <code>ExternalSecrets</code> in
  787. the following manner:</p>
  788. <ol>
  789. <li>ESO uses <code>spec.secretStoreRef</code> to find an appropriate <code>SecretStore</code>. If it
  790. doesn't exist or the <code>spec.controller</code> field doesn't match it won't further
  791. process this ExternalSecret.</li>
  792. <li>ESO instanciates an external API client using the specified credentials from
  793. the <code>SecretStore</code> spec.</li>
  794. <li>ESO fetches the secrets as requested by the <code>ExternalSecret</code>, it will decode
  795. the secrets if required</li>
  796. <li>ESO creates an <code>Kind=Secret</code> based on the template provided by
  797. <code>ExternalSecret.target.template</code>. The <code>Secret.data</code> can be templated using
  798. the secret values from the external API.</li>
  799. <li>ESO ensures that the secret values stay in sync with the external API</li>
  800. </ol>
  801. <h2 id="roles-and-responsibilities">Roles and responsibilities</h2>
  802. <p>The External Secret Operator is designed to target the following persona:</p>
  803. <ul>
  804. <li><strong>Cluster Operator</strong>: The cluster operator is responsible for setting up the
  805. External Secret Operator, managing access policies and creating
  806. ClusterSecretStores.</li>
  807. <li><strong>Application developer</strong>: The Application developer is responsible for
  808. defining ExternalSecrets and the application configuration</li>
  809. </ul>
  810. <p>Each persona will roughly map to a Kubernetes RBAC role. Depending on your
  811. environment these roles can map to a single user. <strong>Note:</strong> There is no Secret
  812. Operator that handles the lifecycle of the secret, this is out of the scope of
  813. ESO.</p>
  814. <h2 id="access-control">Access Control</h2>
  815. <p>The External Secrets Operator runs as a deployment in your cluster with elevated
  816. privileges. It will create/read/update secrets in all namespaces and has access
  817. to secrets stored in some external API. Ensure that the credentials you provide
  818. give ESO the least privilege necessary.</p>
  819. <p>Design your <code>SecretStore</code>/<code>ClusterSecretStore</code> carefully! Be sure to restrict
  820. access of application developers to read only certain
  821. keys in a shared environment.</p>
  822. <p>You should also consider using Kubernetes' admission control system (e.g.
  823. <a href="https://www.openpolicyagent.org/">OPA</a> or <a href="https://kyverno.io/">Kyverno</a>) for
  824. fine-grained access control.</p>
  825. <h2 id="running-multiple-controller">Running multiple Controller</h2>
  826. <p>You can run multiple controllers within the cluster. One controller can be
  827. limited to only process <code>SecretStores</code> with a predefined <code>spec.controller</code>
  828. field.</p>
  829. <div class="admonition note">
  830. <p class="admonition-title">Testers welcome</p>
  831. <p>This is not widely tested. Please help us test the setup and/or document use-cases.</p>
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