Tracing Langflow with a Self-Hosted Phoenix: Need Help!

Xander S. · 2025-06-05T15:46:25.894Z

@Lawrence H. Hi, I'm currently trying to use a self-hosted phoenix to trace a self-hosted langflow. Has anyone managed to do this?

13 comments

· Sorted by Oldest

RunLLM
APP
·
Yes, you can trace a self-hosted LangFlow with a self-hosted Phoenix instance. The recommended approach is to set up Phoenix as a Docker container (exposing port 6006), configure LangFlow to send traces to Phoenix by setting the `PHOENIX_API_KEY` and `PHOENIX_COLLECTOR_ENDPOINT` environment variables in LangFlow’s `.env` file, and then run both services. This enables Phoenix to collect and visualize traces from LangFlow workflows. For step-by-step instructions, see the <https://github.com/Arize-ai/phoenix/blob/main/docs/tracing/integrations-tracing/langflow.md|LangFlow integration guide>. Would you like more detail on the Docker setup or environment variable configuration? Sources: - <https://github.com/Arize-ai/phoenix/blob/main/docs/tracing/integrations-tracing/langflow.md|LangFlow integration guide>
💡 Hint: Mention RunLLM in the thread for followups.
Xander S.
·
Hey Lawrence H., can you take a look at our docs here and let us know if you have questions?
Lawrence H.
·
Hi thanks for the response. I've been having issues running the docker compose from the langflow repo. Instead I was installing it and running:
PHOENIX_COLLECTOR_ENDPOINT='http://localhost:6006' uv run langflow run
However, the self-hosted fix is not in the current latest version. I tried installing from source, but then running the above command gave an error.
Lawrence H.
·
Do you know when the next langflow release will be, where the self-hosted phoenix update will be included?
Xander S.
·
Thanks for following up John G.
Lawrence H.
·
Thank you for the suggestion, but I'm getting an error when trying to build. Is there documentation for building/running from source?
Xander S.
·
Can you drop the error here Lawrence H.?

Lawrence H.

RuntimeError: Static files directory /Users/lawrence.hepton/github/langflow/src/backend/base/langflow/frontend does not exist.

Lawrence H.
·
Any suggestions 🔒[private user]?
Lawrence H.
·
🔒[private user] there was a release today, but I'm having the same issue. Do you know if the Phoenix fix mentioned above was in the release?
Lawrence H.
·
Yes that's correct 🙂
Lawrence H.
·
Do you have any advice on how I can debug? Nothing is appearing in Phoenix
Lawrence H.
·
🔒[private user] Any updates on this?

RunLLM
APP
·
Yes, you can trace a self-hosted LangFlow with a self-hosted Phoenix instance. The recommended approach is to set up Phoenix as a Docker container (exposing port 6006), configure LangFlow to send traces to Phoenix by setting the `PHOENIX_API_KEY` and `PHOENIX_COLLECTOR_ENDPOINT` environment variables in LangFlow’s `.env` file, and then run both services. This enables Phoenix to collect and visualize traces from LangFlow workflows. For step-by-step instructions, see the <https://github.com/Arize-ai/phoenix/blob/main/docs/tracing/integrations-tracing/langflow.md|LangFlow integration guide>. Would you like more detail on the Docker setup or environment variable configuration? Sources: - <https://github.com/Arize-ai/phoenix/blob/main/docs/tracing/integrations-tracing/langflow.md|LangFlow integration guide>
💡 Hint: Mention RunLLM in the thread for followups.
Xander S.
·
Hey Lawrence H., can you take a look at our docs here and let us know if you have questions?
Lawrence H.
·
Hi thanks for the response. I've been having issues running the docker compose from the langflow repo. Instead I was installing it and running:
PHOENIX_COLLECTOR_ENDPOINT='http://localhost:6006' uv run langflow run
However, the self-hosted fix is not in the current latest version. I tried installing from source, but then running the above command gave an error.
Lawrence H.
·
Do you know when the next langflow release will be, where the self-hosted phoenix update will be included?
Xander S.
·
Thanks for following up John G.
Lawrence H.
·
Thank you for the suggestion, but I'm getting an error when trying to build. Is there documentation for building/running from source?
Xander S.
·
Can you drop the error here Lawrence H.?

Lawrence H.

RuntimeError: Static files directory /Users/lawrence.hepton/github/langflow/src/backend/base/langflow/frontend does not exist.

Lawrence H.
·
Any suggestions 🔒[private user]?
Lawrence H.
·
🔒[private user] there was a release today, but I'm having the same issue. Do you know if the Phoenix fix mentioned above was in the release?
Lawrence H.
·
Yes that's correct 🙂
Lawrence H.
·
Do you have any advice on how I can debug? Nothing is appearing in Phoenix
Lawrence H.
·
🔒[private user] Any updates on this?