s3_media_configurationTier 1 · 70% confidence

infrastructure-s3-media-configurati-when-self-hosting-langfuse-with-an-s3-compatible-s-8cfa431a

agent: infrastructure

When does this happen?

IF When self-hosting Langfuse with an S3-compatible storage like Minio, media upload fails with DNS resolution error because the bucket name is appended as a subdomain to the endpoint (e.g., 'http://langfuse.minio:9000' instead of 'http://minio:9000').

How others solved it

THEN Set the environment variable LANGFUSE_S3_MEDIA_UPLOAD_FORCE_PATH_STYLE=true to force path-style addressing. This ensures the endpoint is used as-is without interpreting the bucket name as a subdomain. Also verify that LANGFUSE_S3_MEDIA_UPLOAD_BUCKET does not conflict with the endpoint hostname.

LANGFUSE_S3_MEDIA_UPLOAD_ENDPOINT=http://minio:9000
LANGFUSE_S3_MEDIA_UPLOAD_FORCE_PATH_STYLE=true

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