Deploy to heroku

[MarcoSteinke]

Hello, right now I am trying to deploy LangFuse to heroku.

My heroku.yml :

setup:
  addons:
    - plan: heroku-postgresql
      as: DATABASE
build:
  docker:
    web: Dockerfile
    worker: worker/Dockerfile
release:
  image: worker
run:
  web: node worker/dist/src/index.js

Project Structure of langfuse:

web/
..node_stuff/
..Dockerfile
..package.json

worker/
..stuff
..Dockerfile
..package.json

heroku.yml
package.json

When deploying to heroku I receive the following error:

remote: =!= There were problems parsing your heroku.yml. We've detected the following issues:
remote:
remote: build.docker.web references a Dockerfile that does not exist

My first thought was to set build.docker.web in heroku.yml to web/Dockerfile. This resulted in the problem, that the workspace worker could no longer be found, because from what I understand the heroku deployment changes the directory to web.

WARNING  Issues occurred when constructing package graph. Turbo will function, but some features may not be available: could not resolve workspaces: io error: No such file or directory (os error 2)
remote:   x invalid scope: package worker not found

Does anybody have experience with deploying LangFuse to heroku?

[MarcoSteinke]

If this is not clear yet, maybe it would be very interesting to work this out and add a deployment guide to heroku.

[marcklingen]

Have a look at the docker compose file, you actually do not need to include the worker as it does not have any functionality in Langfuse v2 (current production setup). Also, I'd pull the production images published to docker hub instead of building the dockerfiles, this should simplify the setup a lot.

Edit, I just checked and apparently it is not possible to directly deploy docker hub images on heroku but you need to pull them locally and then push them to Heroku. When figuring this out, make sure to consider how you continuously upgrade you langfuse instance.

[MarcoSteinke]

Hi Marc,
thank you for your very quick response. As you mentioned in your edit, I tried to deploy your image from dockerhub to heroku. It worked smoothly following https://tmuguet.medium.com/deploying-an-existing-docker-image-to-heroku-484e87f9b7b8 . Now we have langfuse running on heroku.

[MarcoSteinke]

For the upgrade we would have to pull the docker image again and follow the blog post to update our heroku deployment.

[marcklingen]

awesome, glad that you figured this out and thanks for sharing. Can you a note on heroku here in the way that it would have been helpful for you?
https://github.com/langfuse/langfuse-docs/blob/main/pages/docs/deployment/self-host.mdx

[MarcoSteinke]

Definitely. I will add a PR for the minimal heroku deployment.

[marcklingen]

thanks for adding this in langfuse/langfuse-docs#557