Langflow

stack AI / Automation / Development

Visual builder for AI agents and workflows: drag together models, prompts, tools, vector stores and MCP servers on a canvas, chat with the result in a playground, then call it as an API or serve it as an MCP server.

Source code

Install Langflow

It isn't in the main Portainer Templates list yet, so use this one. Portainer takes one URL at a time, so it swaps out whatever list you had before.

In Portainer, head to Settings --> App Templates, paste this in as the URL and save.

https://raw.githubusercontent.com/NotAFlightRisk/portainer-templates-extras/main/templates.json

Open App Templates and pick Langflow.
Fill in Admin password and Database password. Everything else can stay as it is.
Hit Deploy the stack, then open http://<your-server>:7860 in a browser.

The same file Portainer deploys. It reads its settings from a .env next to it.

services:
  langflow:
    image: langflowai/langflow:latest
    restart: unless-stopped
    ports:
      - "${LANGFLOW_PORT:-7860}:7860"
    environment:
      LANGFLOW_SUPERUSER_PASSWORD: ${LANGFLOW_ADMIN_PASSWORD:?Set an admin password}
      LANGFLOW_DATABASE_URL: postgresql://langflow:${LANGFLOW_DB_PASSWORD:?Set a database password}@postgres:5432/langflow
      LANGFLOW_CONFIG_DIR: /app/langflow
      DO_NOT_TRACK: ${LANGFLOW_TELEMETRY_OFF:-false}
    volumes:
      - langflow-data:/app/langflow
    depends_on:
      postgres:
        condition: service_healthy

  postgres:
    image: postgres:17-alpine
    restart: unless-stopped
    environment:
      POSTGRES_DB: langflow
      POSTGRES_USER: langflow
      POSTGRES_PASSWORD: ${LANGFLOW_DB_PASSWORD:?Set a database password}
    volumes:
      - postgres-data:/var/lib/postgresql/data
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U langflow -d langflow"]
      interval: 10s
      timeout: 5s
      retries: 5

volumes:
  langflow-data:
  postgres-data:

Fill in the blanks, as Langflow won't start without them.

# Admin password (required) - For signing in as langflow. Only used to create the account on the very first start.
LANGFLOW_ADMIN_PASSWORD=

# Database password (required) - Letters and numbers only, since it goes into a database URL. Generate one with: openssl rand -hex 32
LANGFLOW_DB_PASSWORD=

# Host port for the web UI
LANGFLOW_PORT=7860

Grab the file and start it.

mkdir langflow && cd langflow
curl -fsSL -o compose.yml https://raw.githubusercontent.com/NotAFlightRisk/portainer-templates-extras/main/apps/langflow/compose.yml
# save the .env tab here as .env first
docker compose up -d

Before you start

Set both passwords before you deploy, since the stack won't start without them. The first start takes a couple of minutes, then open http://<your-host>:7860 (or whichever port you picked) and sign in as langflow with your admin password. Changing that password on the form later does nothing. Add your AI provider's key under Settings --> Model Providers (Ollama works too). The sign-up link makes accounts that stay locked until an admin switches them on, and the open-source version only does that through its API, so treat it as a one-person app. Any account can run its own Python on the server, so only switch on people you trust. Langflow sends anonymous usage stats to its makers. To stop it, add LANGFLOW_TELEMETRY_OFF set to true to the stack's environment variables and redeploy. Uploaded files and its generated keys live in the langflow-data volume, your flows and settings in postgres-data. Docs: docs.langflow.org

Settings

What the Portainer form asks for. With compose they go in the .env file instead.

Variable	What it's for	Default
`LANGFLOW_ADMIN_PASSWORD`	Admin password (required) For signing in as langflow. Only used to create the account on the very first start.	Needs filling in
`LANGFLOW_DB_PASSWORD`	Database password (required) Letters and numbers only, since it goes into a database URL. Generate one with: openssl rand -hex 32	Needs filling in
`LANGFLOW_PORT`	Host port for the web UI	`7860`

Services

The containers this stack runs, with ports as they come out of the box.

Service	Image	Ports
`langflow`	`langflowai/langflow:latest`	`7860:7860`
`postgres`	`postgres:17-alpine`	Internal only

Install Langflow

Before you start

Settings

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