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  8. <title>Overview - External Secrets Operator</title>
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  29. <header class="md-header" data-md-component="header">
  30. <nav class="md-header__inner md-grid" aria-label="Header">
  31. <a href=".." title="External Secrets Operator" class="md-header__button md-logo" aria-label="External Secrets Operator" data-md-component="logo">
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  37. <div class="md-header__title" data-md-component="header-title">
  38. <div class="md-header__ellipsis">
  39. <div class="md-header__topic">
  40. <span class="md-ellipsis">
  41. External Secrets Operator
  42. </span>
  43. </div>
  44. <div class="md-header__topic" data-md-component="header-topic">
  45. <span class="md-ellipsis">
  46. Overview
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  56. <div class="md-search__inner" role="search">
  57. <form class="md-search__form" name="search">
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  67. <div class="md-search__output">
  68. <div class="md-search__scrollwrap" data-md-scrollfix>
  69. <div class="md-search-result" data-md-component="search-result">
  70. <div class="md-search-result__meta">
  71. Initializing search
  72. </div>
  73. <ol class="md-search-result__list"></ol>
  74. </div>
  75. </div>
  76. </div>
  77. </div>
  78. </div>
  79. <div class="md-header__source">
  80. <a href="https://github.com/external-secrets/external-secrets/" title="Go to repository" class="md-source" data-md-component="source">
  81. <div class="md-source__icon md-icon">
  82. <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><path d="M439.55 236.05 244 40.45a28.87 28.87 0 0 0-40.81 0l-40.66 40.63 51.52 51.52c27.06-9.14 52.68 16.77 43.39 43.68l49.66 49.66c34.23-11.8 61.18 31 35.47 56.69-26.49 26.49-70.21-2.87-56-37.34L240.22 199v121.85c25.3 12.54 22.26 41.85 9.08 55a34.34 34.34 0 0 1-48.55 0c-17.57-17.6-11.07-46.91 11.25-56v-123c-20.8-8.51-24.6-30.74-18.64-45L142.57 101 8.45 235.14a28.86 28.86 0 0 0 0 40.81l195.61 195.6a28.86 28.86 0 0 0 40.8 0l194.69-194.69a28.86 28.86 0 0 0 0-40.81z"/></svg>
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  84. <div class="md-source__repository">
  85. External Secrets Operator
  86. </div>
  87. </a>
  88. </div>
  89. </nav>
  90. </header>
  91. <div class="md-container" data-md-component="container">
  92. <main class="md-main" data-md-component="main">
  93. <div class="md-main__inner md-grid">
  94. <div class="md-sidebar md-sidebar--primary" data-md-component="sidebar" data-md-type="navigation" >
  95. <div class="md-sidebar__scrollwrap">
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  101. </a>
  102. External Secrets Operator
  103. </label>
  104. <div class="md-nav__source">
  105. <a href="https://github.com/external-secrets/external-secrets/" title="Go to repository" class="md-source" data-md-component="source">
  106. <div class="md-source__icon md-icon">
  107. <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><path d="M439.55 236.05 244 40.45a28.87 28.87 0 0 0-40.81 0l-40.66 40.63 51.52 51.52c27.06-9.14 52.68 16.77 43.39 43.68l49.66 49.66c34.23-11.8 61.18 31 35.47 56.69-26.49 26.49-70.21-2.87-56-37.34L240.22 199v121.85c25.3 12.54 22.26 41.85 9.08 55a34.34 34.34 0 0 1-48.55 0c-17.57-17.6-11.07-46.91 11.25-56v-123c-20.8-8.51-24.6-30.74-18.64-45L142.57 101 8.45 235.14a28.86 28.86 0 0 0 0 40.81l195.61 195.6a28.86 28.86 0 0 0 40.8 0l194.69-194.69a28.86 28.86 0 0 0 0-40.81z"/></svg>
  108. </div>
  109. <div class="md-source__repository">
  110. External Secrets Operator
  111. </div>
  112. </a>
  113. </div>
  114. <ul class="md-nav__list" data-md-scrollfix>
  115. <li class="md-nav__item">
  116. <a href=".." class="md-nav__link">
  117. Introduction
  118. </a>
  119. </li>
  120. <li class="md-nav__item md-nav__item--active">
  121. <input class="md-nav__toggle md-toggle" data-md-toggle="toc" type="checkbox" id="__toc">
  122. <label class="md-nav__link md-nav__link--active" for="__toc">
  123. Overview
  124. <span class="md-nav__icon md-icon"></span>
  125. </label>
  126. <a href="./" class="md-nav__link md-nav__link--active">
  127. Overview
  128. </a>
  129. <nav class="md-nav md-nav--secondary" aria-label="Table of contents">
  130. <label class="md-nav__title" for="__toc">
  131. <span class="md-nav__icon md-icon"></span>
  132. Table of contents
  133. </label>
  134. <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
  135. <li class="md-nav__item">
  136. <a href="#architecture" class="md-nav__link">
  137. Architecture
  138. </a>
  139. </li>
  140. <li class="md-nav__item">
  141. <a href="#resource-model" class="md-nav__link">
  142. Resource model
  143. </a>
  144. <nav class="md-nav" aria-label="Resource model">
  145. <ul class="md-nav__list">
  146. <li class="md-nav__item">
  147. <a href="#secretstore" class="md-nav__link">
  148. SecretStore
  149. </a>
  150. </li>
  151. <li class="md-nav__item">
  152. <a href="#externalsecret" class="md-nav__link">
  153. ExternalSecret
  154. </a>
  155. </li>
  156. <li class="md-nav__item">
  157. <a href="#clustersecretstore" class="md-nav__link">
  158. ClusterSecretStore
  159. </a>
  160. </li>
  161. </ul>
  162. </nav>
  163. </li>
  164. <li class="md-nav__item">
  165. <a href="#behavior" class="md-nav__link">
  166. Behavior
  167. </a>
  168. </li>
  169. <li class="md-nav__item">
  170. <a href="#roles-and-responsibilities" class="md-nav__link">
  171. Roles and responsibilities
  172. </a>
  173. </li>
  174. <li class="md-nav__item">
  175. <a href="#access-control" class="md-nav__link">
  176. Access Control
  177. </a>
  178. </li>
  179. <li class="md-nav__item">
  180. <a href="#running-multiple-controller" class="md-nav__link">
  181. Running multiple Controller
  182. </a>
  183. </li>
  184. </ul>
  185. </nav>
  186. </li>
  187. <li class="md-nav__item md-nav__item--nested">
  188. <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_3" type="checkbox" id="__nav_3" >
  189. <label class="md-nav__link" for="__nav_3">
  190. API Types
  191. <span class="md-nav__icon md-icon"></span>
  192. </label>
  193. <nav class="md-nav" aria-label="API Types" data-md-level="1">
  194. <label class="md-nav__title" for="__nav_3">
  195. <span class="md-nav__icon md-icon"></span>
  196. API Types
  197. </label>
  198. <ul class="md-nav__list" data-md-scrollfix>
  199. <li class="md-nav__item">
  200. <a href="../api-externalsecret/" class="md-nav__link">
  201. ExternalSecret
  202. </a>
  203. </li>
  204. <li class="md-nav__item">
  205. <a href="../api-secretstore/" class="md-nav__link">
  206. SecretStore
  207. </a>
  208. </li>
  209. <li class="md-nav__item">
  210. <a href="../api-clustersecretstore/" class="md-nav__link">
  211. ClusterSecretStore
  212. </a>
  213. </li>
  214. </ul>
  215. </nav>
  216. </li>
  217. <li class="md-nav__item md-nav__item--nested">
  218. <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_4" type="checkbox" id="__nav_4" >
  219. <label class="md-nav__link" for="__nav_4">
  220. Guides
  221. <span class="md-nav__icon md-icon"></span>
  222. </label>
  223. <nav class="md-nav" aria-label="Guides" data-md-level="1">
  224. <label class="md-nav__title" for="__nav_4">
  225. <span class="md-nav__icon md-icon"></span>
  226. Guides
  227. </label>
  228. <ul class="md-nav__list" data-md-scrollfix>
  229. <li class="md-nav__item">
  230. <a href="../guides-introduction/" class="md-nav__link">
  231. Introduction
  232. </a>
  233. </li>
  234. <li class="md-nav__item">
  235. <a href="../guides-getting-started/" class="md-nav__link">
  236. Getting started
  237. </a>
  238. </li>
  239. <li class="md-nav__item">
  240. <a href="../guides-templating/" class="md-nav__link">
  241. Advanced Templating
  242. </a>
  243. </li>
  244. <li class="md-nav__item">
  245. <a href="../guides-multi-tenancy/" class="md-nav__link">
  246. Multi Tenancy
  247. </a>
  248. </li>
  249. <li class="md-nav__item">
  250. <a href="../guides-metrics/" class="md-nav__link">
  251. Metrics
  252. </a>
  253. </li>
  254. </ul>
  255. </nav>
  256. </li>
  257. <li class="md-nav__item md-nav__item--nested">
  258. <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_5" type="checkbox" id="__nav_5" >
  259. <label class="md-nav__link" for="__nav_5">
  260. Provider
  261. <span class="md-nav__icon md-icon"></span>
  262. </label>
  263. <nav class="md-nav" aria-label="Provider" data-md-level="1">
  264. <label class="md-nav__title" for="__nav_5">
  265. <span class="md-nav__icon md-icon"></span>
  266. Provider
  267. </label>
  268. <ul class="md-nav__list" data-md-scrollfix>
  269. <li class="md-nav__item md-nav__item--nested">
  270. <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_5_1" type="checkbox" id="__nav_5_1" >
  271. <label class="md-nav__link" for="__nav_5_1">
  272. AWS
  273. <span class="md-nav__icon md-icon"></span>
  274. </label>
  275. <nav class="md-nav" aria-label="AWS" data-md-level="2">
  276. <label class="md-nav__title" for="__nav_5_1">
  277. <span class="md-nav__icon md-icon"></span>
  278. AWS
  279. </label>
  280. <ul class="md-nav__list" data-md-scrollfix>
  281. <li class="md-nav__item">
  282. <a href="../provider-aws-secrets-manager/" class="md-nav__link">
  283. Secrets Manager
  284. </a>
  285. </li>
  286. <li class="md-nav__item">
  287. <a href="../provider-aws-parameter-store/" class="md-nav__link">
  288. Parameter Store
  289. </a>
  290. </li>
  291. </ul>
  292. </nav>
  293. </li>
  294. <li class="md-nav__item md-nav__item--nested">
  295. <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_5_2" type="checkbox" id="__nav_5_2" >
  296. <label class="md-nav__link" for="__nav_5_2">
  297. Azure
  298. <span class="md-nav__icon md-icon"></span>
  299. </label>
  300. <nav class="md-nav" aria-label="Azure" data-md-level="2">
  301. <label class="md-nav__title" for="__nav_5_2">
  302. <span class="md-nav__icon md-icon"></span>
  303. Azure
  304. </label>
  305. <ul class="md-nav__list" data-md-scrollfix>
  306. <li class="md-nav__item">
  307. <a href="../provider-azure-key-vault/" class="md-nav__link">
  308. Key Vault
  309. </a>
  310. </li>
  311. </ul>
  312. </nav>
  313. </li>
  314. <li class="md-nav__item md-nav__item--nested">
  315. <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_5_3" type="checkbox" id="__nav_5_3" >
  316. <label class="md-nav__link" for="__nav_5_3">
  317. Google
  318. <span class="md-nav__icon md-icon"></span>
  319. </label>
  320. <nav class="md-nav" aria-label="Google" data-md-level="2">
  321. <label class="md-nav__title" for="__nav_5_3">
  322. <span class="md-nav__icon md-icon"></span>
  323. Google
  324. </label>
  325. <ul class="md-nav__list" data-md-scrollfix>
  326. <li class="md-nav__item">
  327. <a href="../provider-google-secrets-manager/" class="md-nav__link">
  328. Secrets Manager
  329. </a>
  330. </li>
  331. </ul>
  332. </nav>
  333. </li>
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  444. SecretStore
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  449. ExternalSecret
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  454. ClusterSecretStore
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  489. </a>
  490. <h1 id="api-overview">API Overview</h1>
  491. <h2 id="architecture">Architecture</h2>
  492. <p><img alt="high-level" src="../pictures/diagrams-high-level-simple.png" /></p>
  493. <p>The External Secrets Operator extends Kubernetes with <a href="https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/">Custom
  494. Resources</a>,
  495. which define where secrets live and how to synchronize them. The controller
  496. fetches secrets from an external API and creates Kubernetes
  497. <a href="https://kubernetes.io/docs/concepts/configuration/secret/">secrets</a>. If the
  498. secret from the external API changes, the controller will reconcile the state in
  499. the cluster and update the secrets accordingly.</p>
  500. <h2 id="resource-model">Resource model</h2>
  501. <p>To understand the mechanics of the operator let's start with the data model. The
  502. SecretStore references an bucket of key/value pairs. But because every external
  503. API is slightly different this bucket may be e.g. an instance of an Azure
  504. KeyVault or a AWS Secrets Manager in a certain AWS Account and region. Please
  505. take a look at the provider documentation to see what the Bucket actually maps
  506. to.</p>
  507. <p><img alt="Resource Mapping" src="../pictures/diagrams-resource-mapping.png" /></p>
  508. <h3 id="secretstore">SecretStore</h3>
  509. <p>The idea behind the <a href="../api-secretstore/">SecretStore</a> resource is to separate concerns of
  510. authentication/access and the actual Secret and configuration needed for
  511. workloads. The ExternalSecret specifies what to fetch, the SecretStore specifies
  512. how to access. This resource is namespaced.</p>
  513. <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>
  514. <span class="nt">kind</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">SecretStore</span>
  515. <span class="nt">metadata</span><span class="p">:</span>
  516. <span class="nt">name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">secretstore-sample</span>
  517. <span class="nt">spec</span><span class="p">:</span>
  518. <span class="nt">controller</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">dev</span>
  519. <span class="nt">provider</span><span class="p">:</span>
  520. <span class="nt">aws</span><span class="p">:</span>
  521. <span class="nt">service</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">SecretsManager</span>
  522. <span class="nt">role</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">arn:aws:iam::123456789012:role/team-a-reader</span>
  523. <span class="nt">region</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">us-east-1</span>
  524. <span class="nt">auth</span><span class="p">:</span>
  525. <span class="nt">secretRef</span><span class="p">:</span>
  526. <span class="nt">accessKeyIDSecretRef</span><span class="p">:</span>
  527. <span class="nt">name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">awssm-secret</span>
  528. <span class="nt">key</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">access-key</span>
  529. <span class="nt">secretAccessKeySecretRef</span><span class="p">:</span>
  530. <span class="nt">name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">awssm-secret</span>
  531. <span class="nt">key</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">secret-access-key</span>
  532. </code></pre></div>
  533. The <code>SecretStore</code> contains references to secrets which hold credentials to
  534. access the external API.</p>
  535. <h3 id="externalsecret">ExternalSecret</h3>
  536. <p>An <a href="../api-externalsecret/">ExternalSecret</a> declares what data to fetch. It has a reference to a
  537. <code>SecretStore</code> which knows how to access that data. The controller uses that
  538. <code>ExternalSecret</code> as a blueprint to create secrets.</p>
  539. <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>
  540. <span class="nt">kind</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">ExternalSecret</span>
  541. <span class="nt">metadata</span><span class="p">:</span>
  542. <span class="nt">name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">example</span>
  543. <span class="nt">spec</span><span class="p">:</span>
  544. <span class="nt">refreshInterval</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">1h</span>
  545. <span class="nt">secretStoreRef</span><span class="p">:</span>
  546. <span class="nt">name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">secretstore-sample</span>
  547. <span class="nt">kind</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">SecretStore</span>
  548. <span class="nt">target</span><span class="p">:</span>
  549. <span class="nt">name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">secret-to-be-created</span>
  550. <span class="nt">creationPolicy</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">Owner</span>
  551. <span class="nt">data</span><span class="p">:</span>
  552. <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>
  553. <span class="nt">remoteRef</span><span class="p">:</span>
  554. <span class="nt">key</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">provider-key</span>
  555. <span class="nt">version</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">provider-key-version</span>
  556. <span class="nt">property</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">provider-key-property</span>
  557. <span class="nt">dataFrom</span><span class="p">:</span>
  558. <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>
  559. </code></pre></div>
  560. <h3 id="clustersecretstore">ClusterSecretStore</h3>
  561. <p>The <a href="../api-clustersecretstore/">ClusterSecretStore</a> is a global, cluster-wide SecretStore that can be
  562. referenced from all namespaces. You can use it to provide a central gateway to your secret provider.</p>
  563. <h2 id="behavior">Behavior</h2>
  564. <p>The External Secret Operator (ESO for brevity) reconciles <code>ExternalSecrets</code> in
  565. the following manner:</p>
  566. <ol>
  567. <li>ESO uses <code>spec.secretStoreRef</code> to find an appropriate <code>SecretStore</code>. If it
  568. doesn't exist or the <code>spec.controller</code> field doesn't match it won't further
  569. process this ExternalSecret.</li>
  570. <li>ESO instanciates an external API client using the specified credentials from
  571. the <code>SecretStore</code> spec.</li>
  572. <li>ESO fetches the secrets as requested by the <code>ExternalSecret</code>, it will decode
  573. the secrets if required</li>
  574. <li>ESO creates an <code>Kind=Secret</code> based on the template provided by
  575. <code>ExternalSecret.target.template</code>. The <code>Secret.data</code> can be templated using
  576. the secret values from the external API.</li>
  577. <li>ESO ensures that the secret values stay in sync with the external API</li>
  578. </ol>
  579. <h2 id="roles-and-responsibilities">Roles and responsibilities</h2>
  580. <p>The External Secret Operator is designed to target the following persona:</p>
  581. <ul>
  582. <li><strong>Cluster Operator</strong>: The cluster operator is responsible for setting up the
  583. External Secret Operator, managing access policies and creating
  584. ClusterSecretStores.</li>
  585. <li><strong>Application developer</strong>: The Application developer is responsible for
  586. defining ExternalSecrets and the application configuration</li>
  587. </ul>
  588. <p>Each persona will roughly map to a Kubernetes RBAC role. Depending on your
  589. environment these roles can map to a single user. <strong>Note:</strong> There is no Secret
  590. Operator that handles the lifecycle of the secret, this is out of the scope of
  591. ESO.</p>
  592. <h2 id="access-control">Access Control</h2>
  593. <p>The External Secrets Operator runs as a deployment in your cluster with elevated
  594. privileges. It will create/read/update secrets in all namespaces and has access
  595. to secrets stored in some external API. Ensure that the credentials you provide
  596. give ESO the least privilege necessary.</p>
  597. <p>Design your <code>SecretStore</code>/<code>ClusterSecretStore</code> carefully! Be sure to restrict
  598. access of application developers to read only certain
  599. keys in a shared environment.</p>
  600. <p>You should also consider using Kubernetes' admission control system (e.g.
  601. <a href="https://www.openpolicyagent.org/">OPA</a> or <a href="https://kyverno.io/">Kyverno</a>) for
  602. fine-grained access control.</p>
  603. <h2 id="running-multiple-controller">Running multiple Controller</h2>
  604. <p>You can run multiple controller within the cluster. One controller can be
  605. limited to only process <code>SecretStores</code> with a predefined <code>spec.controller</code>
  606. field.</p>
  607. <div class="admonition note">
  608. <p class="admonition-title">Testers welcome</p>
  609. <p>This is not widely tested. Please help us test the setup and/or document use-cases.</p>
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