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<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's default database is SQLite, but you can configure Langflow to use PostgreSQL instead."><meta data-rh="true" property="og:description" content="Langflow'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"><script data-rh="true" type="application/ld+json">{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Configure an external PostgreSQL database","item":"https://docs.langflow.org/configuration-custom-database"}]}</script><link rel="preconnect" href="https://www.google-analytics.com">
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</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"><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></li><li class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link">Configure an external PostgreSQL database</span></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'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>
|
||
<ol>
|
||
<li>
|
||
<p>If Langflow is running, quit Langflow.</p>
|
||
</li>
|
||
<li>
|
||
<p>Find your PostgreSQL database's connection string in the format <code>postgresql://user:password@host:port/dbname</code>.</p>
|
||
</li>
|
||
</ol>
|
||
<p>The hostname in your connection string depends on how you're running PostgreSQL:</p>
|
||
<ul>
|
||
<li>If you're running PostgreSQL directly on your machine, use <code>localhost</code>.</li>
|
||
<li>If you're running PostgreSQL in Docker Compose, use the service name, such as <code>postgres</code>.</li>
|
||
<li>If you're running PostgreSQL in a separate Docker container with <code>docker run</code>, use the container's IP address or network alias.</li>
|
||
</ul>
|
||
<ol start="3">
|
||
<li>
|
||
<p>Create a Langflow <code>.env</code> file if you don't already have one:</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">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>touch .env</span></div></div><br></code></div></div>
|
||
<p>You can use the <a href="https://github.com/langflow-ai/langflow/blob/main/.env.example" target="_blank" rel="noopener noreferrer"><code>.env.example</code></a> file in the Langflow repository as a template for your own <code>.env</code> file.</p>
|
||
</li>
|
||
<li>
|
||
<p>In your <code>.env</code> file, set <code>LANGFLOW_DATABASE_URL</code> to your your PostgreSQL connection string:</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">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>LANGFLOW_DATABASE_URL="postgresql://user:password@localhost:5432/dbname"</span></div></div><br></code></div></div>
|
||
</li>
|
||
<li>
|
||
<p>Save your changes, and then start Langflow with your <code>.env</code> file:</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">_<!-- -->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>
|
||
</li>
|
||
<li>
|
||
<p>In Langflow, run any flow to create traffic.</p>
|
||
</li>
|
||
<li>
|
||
<p>Inspect your PostgreSQL deployment's tables and activity to verify that new tables and traffic were created after you ran a flow.</p>
|
||
</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>Docker Compose creates an isolated network for all services defined in <code>docker-compose.yml</code>. This ensures that the services can communicate with each other using their service names as hostnames, such as <code>postgres</code> in the database URL.
|
||
In contrast, if you run PostgreSQL separately with <code>docker run</code>, it launches in a different network than the Langflow container, and this prevents Langflow from connecting to PostgreSQL using the service name.</p>
|
||
<p>You can use the <a href="https://github.com/langflow-ai/langflow/blob/main/docker_example/docker-compose.yml" target="_blank" rel="noopener noreferrer"><code>docker-compose.yml</code></a> file in the Langflow repository to launches Langflow and PostgreSQL containers in the same Docker network, ensuring proper connectivity between services.
|
||
This configuration 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 'always' when using 'latest' 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> - "7860:7860"</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> - "5432:5432"</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>
|
||
<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=${POSTGRES_DB}</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span> ports:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span> - "${POSTGRES_PORT}:5432"</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> - "${LANGFLOW_PORT_1}:7860"</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span> depends_on:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span> - postgres</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span> environment:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span> - LANGFLOW_DATABASE_URL=postgresql://${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> - "${LANGFLOW_PORT_2}:7860"</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span> depends_on:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span> - postgres</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span> environment:</span></div></div><div><span class="ch-code-line-number">_<!-- -->46</span><div style="display:inline-block;margin-left:16px"><span> - LANGFLOW_DATABASE_URL=postgresql://${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 = 'langflow';</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="docusaurus-mt-lg pagination-nav" 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="theme-layout-footer footer"><div class="container container-fluid"><div class="row footer__links"><div class="theme-layout-footer-column col footer__col"><div class="footer__title"></div><ul class="footer__items clean-list"><li class="footer__item"><div class="footer-links">
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