dosubot[bot]
commented
1 week ago To resolve the issues with the backend, celeryworker, and flower services not starting due to a missing langflow module, and the frontend showing a loading image with a JavaScript error, follow these steps:
-
Ensure
langflowModule is Installed: Make sure thelangflowmodule is installed in the Docker image used by thebackend,celeryworker, andflowerservices. Add the installation command in the Dockerfile or the startup script. -
Check Dockerfile and Startup Script: Verify that the Dockerfile or the startup script used in the
backend,celeryworker, andflowerservices includes the installation of thelangflowmodule. -
Update
docker-compose.yml: Ensure that thedocker-compose.ymlfile correctly references the Docker images and paths. Here is an example configuration:
version: "3.8"
services:
backend: &backend
image: "ogabrielluiz/langflow:latest"
build:
context: ../
dockerfile: base.Dockerfile
depends_on:
- db
- broker
- result_backend
env_file:
- .env
volumes:
- ../:/app
- ./startup-backend.sh:/startup-backend.sh
command: /startup-backend.sh
healthcheck:
test: "exit 0"
deploy:
labels:
- traefik.enable=true
- traefik.constraint-label-stack=${TRAEFIK_TAG?Variable not set}
- traefik.http.routers.${STACK_NAME?Variable not set}-backend-http.rule=PathPrefix(`/api/v1`) || PathPrefix(`/docs`) || PathPrefix(`/health`)
- traefik.http.services.${STACK_NAME?Variable not set}-backend.loadbalancer.server.port=7860
celeryworker:
<<: *backend
env_file:
- .env
build:
context: ../
dockerfile: base.Dockerfile
command: celery -A langflow.worker.celery_app worker --loglevel=DEBUG --concurrency=1 -n lf-worker@%h
healthcheck:
test: "exit 0"
deploy:
replicas: 1
flower:
<<: *backend
env_file:
- .env
networks:
- default
build:
context: ../
dockerfile: base.Dockerfile
environment:
- FLOWER_PORT=5555
command: /bin/sh -c "celery -A langflow.worker.celery_app --broker=${BROKER_URL?Variable not set} flower --port=5555"
deploy:
labels:
- traefik.enable=true
- traefik.docker.network=${TRAEFIK_PUBLIC_NETWORK?Variable not set}
- traefik.constraint-label=${TRAEFIK_PUBLIC_TAG?Variable not set}
- traefik.http.routers.${STACK_NAME?Variable not set}-flower-http.rule=Host(`flower.${DOMAIN?Variable not set}`)
- traefik.http.routers.${STACK_NAME?Variable not set}-flower-http.entrypoints=http
- traefik.http.routers.${STACK_NAME?Variable not set}-flower-http.middlewares=${STACK_NAME?Variable not set}-https-redirect
- traefik.http.routers.${STACK_NAME?Variable not set}-flower-https.rule=Host(`flower.${DOMAIN?Variable not set}`)
- traefik.http.routers.${STACK_NAME?Variable not set}-flower-https.entrypoints=https
- traefik.http.routers.${STACK_NAME?Variable not set}-flower-https.tls=true
- traefik.http.routers.${STACK_NAME?Variable not set}-flower-https.tls.certresolver=le
- traefik.http.services.${STACK_NAME?Variable not set}-flower.loadbalancer.server.port=5555
frontend:
image: "ogabrielluiz/langflow_frontend:latest"
env_file:
- .env
build:
context: ../src/frontend
dockerfile: Dockerfile
args:
- BACKEND_URL=http://backend:7860
restart: on-failure
deploy:
labels:
- traefik.enable=true
- traefik.constraint-label-stack=${TRAEFIK_TAG?Variable not set}
- traefik.http.routers.${STACK_NAME?Variable not set}-frontend-http.rule=PathPrefix(`/`)
- traefik.http.services.${STACK_NAME?Variable not set}-frontend.loadbalancer.server.port=80-
Frontend JavaScript Error: Ensure that the
BACKEND_URLis correctly set in the frontend service. The errorSyntaxError: Unexpected token '<'usually indicates that the frontend is trying to load an HTML page instead of a JavaScript file, often due to an incorrect backend URL. -
Common Installation Issues: If you encounter the error
No module named 'langflow.__main__', try the following steps:- Run
python -m langflow runinstead oflangflow run. - Reinstall Langflow with
python -m pip install langflow --pre -U. - Reinstall Langflow and its dependencies with
python -m pip install langflow --pre -U --force-reinstall.
If you encounter the error
Something went wrong running migrations. Please, run 'langflow migration --fix', clear the cache by deleting the contents of the cache folder located at:- Linux or WSL2 on Windows:
home/<username>/.cache/langflow/ - MacOS:
/Users/<username>/Library/Caches/langflow/
This error can occur during Langflow upgrades when the new version can't override
langflow-pre.dbin.cache/langflow/. Clearing the cache removes this file but will also erase your settings. Back up your files before clearing the folder if you wish to retain them [1][2][3][4][5]. - Run
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chibexme
nicoloboschi
I'm trying to deploy langflow on ubuntu staging server through docker-compose
every other services starts successful except - backend, celeryworker and flower as shown in the below screenshot.
With error message - /usr/local/bin/python: No module named langflow
when i access the frontend through the browser, i only see the loading image and javascript error as shown on the below screenshot