langflow/configuration-custom-database.html

<!doctype html>
<html lang="en" dir="ltr" class="docs-wrapper plugin-docs plugin-id-default docs-version-current docs-doc-page docs-doc-id-Configuration/configuration-custom-database" data-has-hydrated="false">
<head>
<meta charset="UTF-8">
<meta name="generator" content="Docusaurus v3.7.0">
<title data-rh="true">Configure an external PostgreSQL database | Langflow Documentation</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://docs.langflow.org/configuration-custom-database"><meta data-rh="true" property="og:locale" content="en"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-default-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-current"><meta data-rh="true" property="og:title" content="Configure an external PostgreSQL database | Langflow Documentation"><meta data-rh="true" name="description" content="Langflow&#x27;s default database is SQLite, but you can configure Langflow to use PostgreSQL instead."><meta data-rh="true" property="og:description" content="Langflow&#x27;s default database is SQLite, but you can configure Langflow to use PostgreSQL instead."><link data-rh="true" rel="icon" href="/img/favicon.ico"><link data-rh="true" rel="canonical" href="https://docs.langflow.org/configuration-custom-database"><link data-rh="true" rel="alternate" href="https://docs.langflow.org/configuration-custom-database" hreflang="en"><link data-rh="true" rel="alternate" href="https://docs.langflow.org/configuration-custom-database" hreflang="x-default"><link data-rh="true" rel="preconnect" href="https://UZK6BDPCVY-dsn.algolia.net" crossorigin="anonymous"><link rel="preconnect" href="https://www.google-analytics.com">
<link rel="preconnect" href="https://www.googletagmanager.com">
<script async src="https://www.googletagmanager.com/gtag/js?id=G-SLQFLQ3KPT"></script>
<script>function gtag(){dataLayer.push(arguments)}window.dataLayer=window.dataLayer||[],gtag("js",new Date),gtag("config","G-SLQFLQ3KPT",{})</script>


<link rel="search" type="application/opensearchdescription+xml" title="Langflow Documentation" href="/opensearch.xml">


<link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Sora:wght@550;600&amp;display=swap">
<script>!function(){window.semaphore=window.semaphore||[],window.ketch=function(){window.semaphore.push(arguments)};var e=document.createElement("script");e.type="text/javascript",e.src="https://global.ketchcdn.com/web/v3/config/datastax/langflow_org_web/boot.js",e.defer=e.async=!0,document.getElementsByTagName("head")[0].appendChild(e)}()</script>
<script defer="true">!function(){const e=e=>{if(window.gtag&&e.purposes&&"analytics"in e.purposes&&"targeted_advertising"in e.purposes){const n=!0===e.purposes.analytics?"granted":"denied",t=!0===e.purposes.targeted_advertising?"granted":"denied",a={analytics_storage:n,ad_personalization:t,ad_storage:t,ad_user_data:t};window.gtag("consent","update",a)}};window.ketch&&window.ketch("on","consent",e)}()</script><link rel="stylesheet" href="/assets/css/styles.556d0cc8.css">
<script src="/assets/js/runtime~main.36d0d05a.js" defer="defer"></script>
<script src="/assets/js/main.01cab6af.js" defer="defer"></script>
</head>
<body class="navigation-with-keyboard">
<script>!function(){function t(t){document.documentElement.setAttribute("data-theme",t)}var e=function(){try{return new URLSearchParams(window.location.search).get("docusaurus-theme")}catch(t){}}()||function(){try{return window.localStorage.getItem("theme")}catch(t){}}();null!==e?t(e):window.matchMedia("(prefers-color-scheme: dark)").matches?t("dark"):(window.matchMedia("(prefers-color-scheme: light)").matches,t("light"))}(),function(){try{const c=new URLSearchParams(window.location.search).entries();for(var[t,e]of c)if(t.startsWith("docusaurus-data-")){var a=t.replace("docusaurus-data-","data-");document.documentElement.setAttribute(a,e)}}catch(t){}}()</script><div id="__docusaurus"><div role="region" aria-label="Skip to main content"><a class="skipToContent_fXgn" href="#__docusaurus_skipToContent_fallback">Skip to main content</a></div><nav aria-label="Main" class="navbar navbar--fixed-top navbarHideable_m1mJ"><div class="navbar__inner"><div class="navbar__items"><button aria-label="Toggle navigation bar" aria-expanded="false" class="navbar__toggle clean-btn" type="button"><svg width="30" height="30" viewBox="0 0 30 30" aria-hidden="true"><path stroke="currentColor" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2" d="M4 7h22M4 15h22M4 23h22"></path></svg></button><a class="navbar__brand" href="/"><div class="navbar__logo"><img src="/img/lf-docs-light.svg" alt="Langflow" class="themedComponent_mlkZ themedComponent--light_NVdE"><img src="/img/lf-docs-dark.svg" alt="Langflow" class="themedComponent_mlkZ themedComponent--dark_xIcU"></div></a></div><div class="navbar__items navbar__items--right"><a href="https://github.com/langflow-ai/langflow" target="_blank" class="navbar__item navbar__link header-github-link"></a><a href="https://twitter.com/langflow_ai" target="_blank" class="navbar__item navbar__link header-twitter-link"></a><a href="https://discord.gg/EqksyE2EX9" target="_blank" class="navbar__item navbar__link header-discord-link"></a><div class="toggle_vylO colorModeToggle_DEke"><button class="clean-btn toggleButton_gllP toggleButtonDisabled_aARS" type="button" disabled="" title="Switch between dark and light mode (currently light mode)" aria-label="Switch between dark and light mode (currently light mode)" aria-live="polite" aria-pressed="false"><svg viewBox="0 0 24 24" width="24" height="24" class="lightToggleIcon_pyhR"><path fill="currentColor" d="M12,9c1.65,0,3,1.35,3,3s-1.35,3-3,3s-3-1.35-3-3S10.35,9,12,9 M12,7c-2.76,0-5,2.24-5,5s2.24,5,5,5s5-2.24,5-5 S14.76,7,12,7L12,7z M2,13l2,0c0.55,0,1-0.45,1-1s-0.45-1-1-1l-2,0c-0.55,0-1,0.45-1,1S1.45,13,2,13z M20,13l2,0c0.55,0,1-0.45,1-1 s-0.45-1-1-1l-2,0c-0.55,0-1,0.45-1,1S19.45,13,20,13z M11,2v2c0,0.55,0.45,1,1,1s1-0.45,1-1V2c0-0.55-0.45-1-1-1S11,1.45,11,2z M11,20v2c0,0.55,0.45,1,1,1s1-0.45,1-1v-2c0-0.55-0.45-1-1-1C11.45,19,11,19.45,11,20z M5.99,4.58c-0.39-0.39-1.03-0.39-1.41,0 c-0.39,0.39-0.39,1.03,0,1.41l1.06,1.06c0.39,0.39,1.03,0.39,1.41,0s0.39-1.03,0-1.41L5.99,4.58z M18.36,16.95 c-0.39-0.39-1.03-0.39-1.41,0c-0.39,0.39-0.39,1.03,0,1.41l1.06,1.06c0.39,0.39,1.03,0.39,1.41,0c0.39-0.39,0.39-1.03,0-1.41 L18.36,16.95z M19.42,5.99c0.39-0.39,0.39-1.03,0-1.41c-0.39-0.39-1.03-0.39-1.41,0l-1.06,1.06c-0.39,0.39-0.39,1.03,0,1.41 s1.03,0.39,1.41,0L19.42,5.99z M7.05,18.36c0.39-0.39,0.39-1.03,0-1.41c-0.39-0.39-1.03-0.39-1.41,0l-1.06,1.06 c-0.39,0.39-0.39,1.03,0,1.41s1.03,0.39,1.41,0L7.05,18.36z"></path></svg><svg viewBox="0 0 24 24" width="24" height="24" class="darkToggleIcon_wfgR"><path fill="currentColor" d="M9.37,5.51C9.19,6.15,9.1,6.82,9.1,7.5c0,4.08,3.32,7.4,7.4,7.4c0.68,0,1.35-0.09,1.99-0.27C17.45,17.19,14.93,19,12,19 c-3.86,0-7-3.14-7-7C5,9.07,6.81,6.55,9.37,5.51z M12,3c-4.97,0-9,4.03-9,9s4.03,9,9,9s9-4.03,9-9c0-0.46-0.04-0.92-0.1-1.36 c-0.98,1.37-2.58,2.26-4.4,2.26c-2.98,0-5.4-2.42-5.4-5.4c0-1.81,0.89-3.42,2.26-4.4C12.92,3.04,12.46,3,12,3L12,3z"></path></svg></button></div><div class="navbarSearchContainer_Bca1"><button type="button" class="DocSearch DocSearch-Button" aria-label="Search (Command+K)"><span class="DocSearch-Button-Container"><svg width="20" height="20" class="DocSearch-Search-Icon" viewBox="0 0 20 20" aria-hidden="true"><path d="M14.386 14.386l4.0877 4.0877-4.0877-4.0877c-2.9418 2.9419-7.7115 2.9419-10.6533 0-2.9419-2.9418-2.9419-7.7115 0-10.6533 2.9418-2.9419 7.7115-2.9419 10.6533 0 2.9419 2.9418 2.9419 7.7115 0 10.6533z" stroke="currentColor" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"></path></svg><span class="DocSearch-Button-Placeholder">Search</span></span><span class="DocSearch-Button-Keys"></span></button></div></div></div><div role="presentation" class="navbar-sidebar__backdrop"></div></nav><div id="__docusaurus_skipToContent_fallback" class="main-wrapper mainWrapper_z2l0"><div class="docsWrapper_hBAB"><button aria-label="Scroll back to top" class="clean-btn theme-back-to-top-button backToTopButton_sjWU" type="button"></button><div class="docRoot_UBD9"><aside class="theme-doc-sidebar-container docSidebarContainer_YfHR"><div class="sidebarViewport_aRkj"><div class="sidebar_njMd sidebarWithHideableNavbar_wUlq"><a tabindex="-1" class="sidebarLogo_isFc" href="/"><img src="/img/lf-docs-light.svg" alt="Langflow" class="themedComponent_mlkZ themedComponent--light_NVdE"><img src="/img/lf-docs-dark.svg" alt="Langflow" class="themedComponent_mlkZ themedComponent--dark_xIcU"></a><nav aria-label="Docs sidebar" class="menu thin-scrollbar menu_SIkG"><ul class="theme-doc-sidebar-menu menu__list"><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/">Welcome to Langflow</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" role="button" aria-expanded="false" href="/get-started-installation">Get started</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" role="button" aria-expanded="false" href="/basic-prompting">Templates</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" role="button" aria-expanded="false" href="/concepts-overview">Concepts</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" role="button" aria-expanded="false" href="/components-agents">Components</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" role="button" aria-expanded="false" href="/agents-overview">Agents</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" role="button" aria-expanded="false" href="/mcp-server">Model Context Protocol (MCP)</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret menu__link--active" role="button" aria-expanded="true" href="/configuration-api-keys">Configuration</a></div><ul style="display:block;overflow:visible;height:auto" class="menu__list"><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/configuration-api-keys">API keys</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/configuration-authentication">Authentication</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/configuration-cli">Langflow CLI</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link menu__link--active" aria-current="page" tabindex="0" href="/configuration-custom-database">Configure an external PostgreSQL database</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/configuration-global-variables">Global variables</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/environment-variables">Environment variables</a></li></ul></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" role="button" aria-expanded="false" href="/develop-overview">Develop</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" role="button" aria-expanded="false" href="/deployment-overview">Deployment</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" role="button" aria-expanded="false" href="/api">API reference</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" role="button" aria-expanded="false" href="/integrations-apify">Integrations</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" role="button" aria-expanded="false" href="/contributing-community">Contributing</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a href="https://github.com/langflow-ai/langflow/releases/latest" target="_blank" rel="noopener noreferrer" class="menu__link menu__link--sublist menu__link--sublist-caret" role="button" aria-expanded="false">Changelog</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" role="button" aria-expanded="false" href="/luna-for-langflow">Support</a></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 sidebar-ad">
        <a href="https://astra.datastax.com/signup?type=langflow" target="_blank" class="menu__link">
          <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-cloud"><path d="M17.5 19H9a7 7 0 1 1 6.71-9h1.79a4.5 4.5 0 1 1 0 9Z"/></svg>
          <div class="sidebar-ad-text-container">
            <span class="sidebar-ad-text">Use Langflow in the cloud</span>
            <span class="sidebar-ad-text sidebar-ad-text-gradient">Sign up for DataStax Langflow</span>
          </div>
        </a>
      </li></ul></nav></div></div></aside><main class="docMainContainer_TBSr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Configuration</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Configure an external PostgreSQL database</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Configure an external PostgreSQL database</h1></header><style>[data-ch-theme="github-dark"] {  --ch-t-colorScheme: dark;--ch-t-foreground: #c9d1d9;--ch-t-background: #0d1117;--ch-t-lighter-inlineBackground: #0d1117e6;--ch-t-editor-background: #0d1117;--ch-t-editor-foreground: #c9d1d9;--ch-t-editor-lineHighlightBackground: #6e76811a;--ch-t-editor-rangeHighlightBackground: #ffffff0b;--ch-t-editor-infoForeground: #3794FF;--ch-t-editor-selectionBackground: #264F78;--ch-t-focusBorder: #1f6feb;--ch-t-tab-activeBackground: #0d1117;--ch-t-tab-activeForeground: #c9d1d9;--ch-t-tab-inactiveBackground: #010409;--ch-t-tab-inactiveForeground: #8b949e;--ch-t-tab-border: #30363d;--ch-t-tab-activeBorder: #0d1117;--ch-t-editorGroup-border: #30363d;--ch-t-editorGroupHeader-tabsBackground: #010409;--ch-t-editorLineNumber-foreground: #6e7681;--ch-t-input-background: #0d1117;--ch-t-input-foreground: #c9d1d9;--ch-t-input-border: #30363d;--ch-t-icon-foreground: #8b949e;--ch-t-sideBar-background: #010409;--ch-t-sideBar-foreground: #c9d1d9;--ch-t-sideBar-border: #30363d;--ch-t-list-activeSelectionBackground: #6e768166;--ch-t-list-activeSelectionForeground: #c9d1d9;--ch-t-list-hoverBackground: #6e76811a;--ch-t-list-hoverForeground: #c9d1d9; }</style>
<p>Langflow&#x27;s default database is <a href="https://www.sqlite.org/docs.html" target="_blank" rel="noopener noreferrer">SQLite</a>, but you can configure Langflow to use PostgreSQL instead.</p>
<p>This guide walks you through setting up an external database for Langflow by replacing the default SQLite connection string <code>sqlite:///./langflow.db</code> with PostgreSQL.</p>
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="prerequisite">Prerequisite<a href="#prerequisite" class="hash-link" aria-label="Direct link to Prerequisite" title="Direct link to Prerequisite"></a></h2>
<ul>
<li>A <a href="https://www.pgadmin.org/download/" target="_blank" rel="noopener noreferrer">PostgreSQL</a> database</li>
</ul>
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="connect-langflow-to-postgresql">Connect Langflow to PostgreSQL<a href="#connect-langflow-to-postgresql" class="hash-link" aria-label="Direct link to Connect Langflow to PostgreSQL" title="Direct link to Connect Langflow to PostgreSQL"></a></h2>
<p>To connect Langflow to PostgreSQL, follow these steps.</p>
<ol>
<li>Find your PostgreSQL database&#x27;s connection string.
It looks like <code>postgresql://user:password@host:port/dbname</code>.</li>
</ol>
<p>The hostname in your connection string depends on how you&#x27;re running PostgreSQL.</p>
<ul>
<li>If you&#x27;re running PostgreSQL directly on your machine, use <code>localhost</code>.</li>
<li>If you&#x27;re running PostgreSQL in Docker Compose, use the service name, such as <code>postgres</code>.</li>
<li>If you&#x27;re running PostgreSQL in a separate Docker container with <code>docker run</code>, use the container&#x27;s IP address or network alias.</li>
</ul>
<ol start="2">
<li>Create a <code>.env</code> file for configuring Langflow.</li>
</ol>
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>touch .env</span></div></div><br></code></div></div>
<ol start="3">
<li>To set the database URL environment variable, add it to your <code>.env</code> file:</li>
</ol>
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>LANGFLOW_DATABASE_URL=&quot;postgresql://user:password@localhost:5432/dbname&quot;</span></div></div><br></code></div></div>
<div class="theme-admonition theme-admonition-tip admonition_xJq3 alert alert--success"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>tip</div><div class="admonitionContent_BuS1"><p>The Langflow project includes a <a href="https://github.com/langflow-ai/langflow/blob/main/.env.example" target="_blank" rel="noopener noreferrer"><code>.env.example</code></a> file to help you get started.
You can copy the contents of this file into your own <code>.env</code> file and replace the example values with your own preferred settings.
Replace the value for <code>LANGFLOW_DATABASE_URL</code> with your PostgreSQL connection string.</p></div></div>
<ol start="4">
<li>Run Langflow with the <code>.env</code> file:</li>
</ol>
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>uv run langflow run --env-file .env</span></div></div><br></code></div></div>
<ol start="5">
<li>In Langflow, create traffic by running a flow.</li>
<li>Inspect your PostgreSQL deployment&#x27;s tables and activity.
New tables and traffic are created.</li>
</ol>
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="example-langflow-and-postgresql-docker-composeyml">Example Langflow and PostgreSQL docker-compose.yml<a href="#example-langflow-and-postgresql-docker-composeyml" class="hash-link" aria-label="Direct link to Example Langflow and PostgreSQL docker-compose.yml" title="Direct link to Example Langflow and PostgreSQL docker-compose.yml"></a></h2>
<p>The Langflow project includes a <a href="https://github.com/langflow-ai/langflow/blob/main/docker_example/docker-compose.yml" target="_blank" rel="noopener noreferrer">docker-compose.yml</a> file for quick deployment with PostgreSQL.</p>
<p>This configuration launches Langflow and PostgreSQL containers in the same Docker network, ensuring proper connectivity between services. It also sets up persistent volumes for both Langflow and PostgreSQL data.</p>
<p>To start the services, navigate to the <code>/docker_example</code> directory, and then run <code>docker-compose up</code>.</p>
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>services:</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>  langflow:</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>    image: langflowai/langflow:latest    # or another version tag on https://hub.docker.com/r/langflowai/langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>    pull_policy: always                   # set to &#x27;always&#x27; when using &#x27;latest&#x27; image</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>    ports:</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>      - &quot;7860:7860&quot;</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>    depends_on:</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>      - postgres</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>    environment:</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>      - LANGFLOW_DATABASE_URL=postgresql://langflow:langflow@postgres:5432/langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>      # This variable defines where the logs, file storage, monitor data, and secret keys are stored.</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>      - LANGFLOW_CONFIG_DIR=app/langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>    volumes:</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>      - langflow-data:/app/langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>  postgres:</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>    image: postgres:16</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>    environment:</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>      POSTGRES_USER: langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>      POSTGRES_PASSWORD: langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>      POSTGRES_DB: langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>    ports:</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>      - &quot;5432:5432&quot;</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>    volumes:</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>      - langflow-postgres:/var/lib/postgresql/data</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>volumes:</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>  langflow-postgres:    # Persistent volume for PostgreSQL data</span></div></div><div><span class="ch-code-line-number">_<!-- -->29</span><div style="display:inline-block;margin-left:16px"><span>  langflow-data:        # Persistent volume for Langflow data</span></div></div><br></code></div></div>
<div class="theme-admonition theme-admonition-note admonition_xJq3 alert alert--secondary"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z"></path></svg></span>note</div><div class="admonitionContent_BuS1"><p>Docker Compose creates an isolated network for all services defined in the docker-compose.yml file. This ensures that the services can communicate with each other using their service names as hostnames, for example, <code>postgres</code> in the database URL. If you were to run PostgreSQL separately using <code>docker run</code>, it would be in a different network and Langflow wouldn&#x27;t be able to connect to it using the service name.</p></div></div>
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="deploy-multiple-langflow-instances-with-a-shared-database">Deploy multiple Langflow instances with a shared database<a href="#deploy-multiple-langflow-instances-with-a-shared-database" class="hash-link" aria-label="Direct link to Deploy multiple Langflow instances with a shared database" title="Direct link to Deploy multiple Langflow instances with a shared database"></a></h2>
<p>To configure multiple Langflow instances that share the same PostgreSQL database, modify your <code>docker-compose.yml</code> file to include multiple Langflow services.</p>
<p>Use environment variables for more centralized configuration management:</p>
<ol>
<li>Update your <code>.env</code> file with values for your PostgreSQL database:</li>
</ol>
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>POSTGRES_USER=langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>POSTGRES_PASSWORD=your_secure_password</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>POSTGRES_DB=langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>POSTGRES_HOST=postgres</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>POSTGRES_PORT=5432</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>LANGFLOW_CONFIG_DIR=app/langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>LANGFLOW_PORT_1=7860</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>LANGFLOW_PORT_2=7861</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>LANGFLOW_HOST=0.0.0.0</span></div></div><br></code></div></div>
<ol start="2">
<li>Reference these variables in your <code>docker-compose.yml</code>:</li>
</ol>
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>services:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>  postgres:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>    image: postgres:16</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>    environment:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>      - POSTGRES_USER=${POSTGRES_USER}</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>      - POSTGRES_DB=${POSTGRES_DB}</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>    ports:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>      - &quot;${POSTGRES_PORT}:5432&quot;</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>    volumes:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>      - langflow-postgres:/var/lib/postgresql/data</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>  langflow-1:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>    image: langflowai/langflow:latest</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>    pull_policy: always</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>    ports:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>      - &quot;${LANGFLOW_PORT_1}:7860&quot;</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>    depends_on:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>      - postgres</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>    environment:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>      - LANGFLOW_DATABASE_URL=postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@${POSTGRES_HOST}:${POSTGRES_PORT}/${POSTGRES_DB}</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>      - LANGFLOW_CONFIG_DIR=${LANGFLOW_CONFIG_DIR}</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>      - LANGFLOW_HOST=${LANGFLOW_HOST}</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>      - PORT=7860</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>    volumes:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>      - langflow-data-1:/app/langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>  langflow-2:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>    image: langflowai/langflow:latest</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>    pull_policy: always</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>    ports:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>      - &quot;${LANGFLOW_PORT_2}:7860&quot;</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>    depends_on:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>      - postgres</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>    environment:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>      - LANGFLOW_DATABASE_URL=postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@${POSTGRES_HOST}:${POSTGRES_PORT}/${POSTGRES_DB}</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>      - LANGFLOW_CONFIG_DIR=${LANGFLOW_CONFIG_DIR}</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>      - LANGFLOW_HOST=${LANGFLOW_HOST}</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>      - PORT=7860</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>    volumes:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>      - langflow-data-2:/app/langflow</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span></span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>volumes:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>  langflow-postgres:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>  langflow-data-1:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span>  langflow-data-2:</span></div></div><br></code></div></div>
<ol start="3">
<li>
<p>Deploy the file with <code>docker-compose up</code>.
You can access the first Langflow instance at <code>http://localhost:7860</code>, and the second Langflow instance at <code>http://localhost:7861</code>.</p>
</li>
<li>
<p>To confirm both instances are using the same database, run the <code>docker exec</code> command to start <code>psql</code> in your PostgreSQL container.
Your container name may vary.</p>
</li>
</ol>
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>docker exec -it docker-test-postgres-1 psql -U langflow -d langflow</span></div></div><br></code></div></div>
<ol start="5">
<li>Query the database for active connections:</li>
</ol>
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>langflow=# SELECT * FROM pg_stat_activity WHERE datname = &#x27;langflow&#x27;;</span></div></div><br></code></div></div>
<ol start="6">
<li>Examine the query results for multiple connections with different <code>client_addr</code> values, for example <code>172.21.0.3</code> and <code>172.21.0.4</code>.</li>
</ol>
<p>Since each Langflow instance runs in its own container on the Docker network, using different incoming IP addresses confirms that both instances are actively connected to the PostgreSQL database.</p>
<ol start="7">
<li>To quit psql, type <code>quit</code>.</li>
</ol></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/configuration-cli"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Langflow CLI</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/configuration-global-variables"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Global variables</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#prerequisite" class="table-of-contents__link toc-highlight">Prerequisite</a></li><li><a href="#connect-langflow-to-postgresql" class="table-of-contents__link toc-highlight">Connect Langflow to PostgreSQL</a></li><li><a href="#example-langflow-and-postgresql-docker-composeyml" class="table-of-contents__link toc-highlight">Example Langflow and PostgreSQL docker-compose.yml</a></li><li><a href="#deploy-multiple-langflow-instances-with-a-shared-database" class="table-of-contents__link toc-highlight">Deploy multiple Langflow instances with a shared database</a></li></ul></div></div></div></div></main></div></div></div><footer class="footer"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title"></div><ul class="footer__items clean-list"><li class="footer__item"><div class="footer-links">
                  <span>© 2025 Langflow</span>
                  <span id="preferenceCenterContainer"> ·&nbsp; <a href="https://langflow.org/preferences">Manage Privacy Choices</a></span>
                  </div></li></ul></div></div><div class="footer__bottom text--center"><div class="margin-bottom--sm"><img src="/img/lf-docs-light.svg" alt="Langflow" class="footer__logo themedComponent_mlkZ themedComponent--light_NVdE" width="160" height="40"><img src="/img/lf-docs-dark.svg" alt="Langflow" class="footer__logo themedComponent_mlkZ themedComponent--dark_xIcU" width="160" height="40"></div></div></div></footer><div style="position:fixed;right:20px;bottom:20px;z-index:100;display:flex;align-items:center;gap:10px;cursor:pointer"><div style="background-color:#f6f6f6;border-radius:50%;width:48px;height:48px;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 4px rgba(0,0,0,0.1)"><img src="/img/langflow-icon-black-transparent.svg" style="width:40px" alt="Search"></div></div></div>
</body>
</html>