What is Dify? A complete Overview
Dify is an open-source LLM application development platform that combines AI workflow orchestration, a Retrieval Augmented Generation (RAG) pipeline, agent capabilities, model management, and observability features. It enables developers and non-technical users to rapidly build and operate production-grade generative AI applications - chatbots, copilots, and multi-step AI agents - on top of OpenAI, Anthropic, Azure OpenAI, local models served via Ollama, and dozens of other providers.
System Requirements
Dify runs 12 background services simultaneously to handle app logic, task queues, and data indexing. To keep your system stable and fast, make sure your machine meets these requirements.
| Resource | Minimum | Recommended |
|---|---|---|
| CPU | 2 vCPUs | 4 vCPUs |
| RAM | 4 GB | 8 GB |
| Disk | 20 GB | 40 GB |
Architecture & Service Map
To keep your system secure, Nginx acts as the only public entrance. It routes external traffic to the correct places, while all other background services and databases stay hidden inside a private network.
| Service | Port(s) | Purpose |
|---|---|---|
| Dify Nginx | 80, 443 (Public) | Handles incoming web traffic and manages security certificates. |
| Dify API | 5001 (Internal) | Runs the core backend and API tools. |
| Dify Worker / Beat | Internal | Manages background tasks and scheduled items. |
| Dify API Websocket | Internal | Streams real-time chat answers to users. |
| Dify Plugin Daemon | Internal (5003) | Safely runs third-party add-ons. |
| Dify Web | 3000 (Internal) | Powers the visual user interface. |
| Dify Sandbox | Internal | Runs custom code tools in a safe, isolated environment. |
| PostgreSQL | Internal | Stores your primary app data and user settings. |
| Redis | Internal | Caches quick data and manages background task queues. |
| Weaviate | Internal | Stores document search data for your AI (RAG). |
| SSRF Proxy | Internal (3128) | Blocks security threats from malicious external links. |
| OpenSSH | 22 (Public) | Lets you manage the server remotely (protected by firewall rules). |
Security and Certificates
Dify includes automated safety measures to keep your data, models, and background services protected right out of the box.
Network Protection
- Firewall Blocks: The system blocks all incoming traffic by default. It only allows access through standard management and web ports (22, 80, and 443).
- Hidden Services: Core databases and services do not connect to the open internet. They only talk to each other inside a private virtual network.
- Fresh Passwords: Dify automatically generates unique database passwords and keys during your first setup, then secures them with strict root-only access.
SSL Certificates
Dify checks your connection type and sets up security encryption automatically before the web proxy starts:
- Public Websites: The system automatically gets a free, trusted certificate from Let's Encrypt to secure user traffic.
- Private Networks: If your server is on a private network without public internet access, Dify creates a self-signed certificate. You will just need to bypass the local browser warning to log in.
- Custom Enterprise Setup: You can drop your own company certificates or wildcard files directly into the local folder to replace the default ones.
Where Your Data Lives
Dify saves all your data safely onto your host server so you do not lose it when containers restart. You can find everything in the /opt/dify/docker/volumes/ folder:
db/– Stores your core user data and project settings (PostgreSQL).redis/– Keeps temporary task queues and live app states.weaviate/– Holds your document chunks and text search data.app/storage/– Stores your uploaded files, images, and system caches.plugin_storage/– Keeps files created by external plugins.
Potential Challenges to Keep in Mind
While Dify speeds up your AI projects, it might not fit every situation perfectly. Keep these practical factors in mind before you get started.
- High Server Needs
Dify runs 12 background services at the same time. You need basic server experience to update and manage the system. If you only want to write a quick script to read a few files, Dify is too big for your needs.
- Slowdowns Under Heavy Traffic
Dify can slow down if you send too many complex requests at the exact same time. To handle heavy business traffic, you must manually duplicate your worker files and change your database settings to share the load.
- Visual Limits for Advanced Coding
Dify uses simple visual blocks to build steps. If you want to create highly complex loops where an AI talks to itself forever, the visual builder will limit you. Dify works best for standard business apps, while advanced research requires raw code.
- Connection Errors from Slow Models
Complex models take a long time to think. Dify expects fast answers. If a model takes too long, your browser will freeze or show a "502 Bad Gateway" error. You must open your settings files and manually increase the timeout limits to fix this.
- Constant Security Updates
Dify lets users run custom code, so it uses an isolated sandbox to protect your server. To keep hackers out, you must update the software regularly. Older versions have security holes that can put your whole company network at risk.
Summary
Dify runs 12 background services at once, so you need basic server experience to keep the system running smoothly under heavy traffic. The simple visual blocks help you build standard business apps quickly, but they will limit you if you want to write highly complex, custom code. You must also update the software regularly and adjust your settings to prevent slow models from crashing your connection or creating security risks.