apache/apisix

bug: cannot use file-logger to log to stdout

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#6,797 opened on Apr 6, 2022

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Description

Current Behavior

When using the file-logger plugin, it is possible to send the logging to stdout by defining /dev/stdout. This in order to use the docker output and relais this in kubernetes to a ELK stack. Though an error is thrown indicating a permission denied for the current user.

Expected Behavior

Be able to use /dev/stdout as a destination with the file-logger plugin.

Error Logs

failed to open file: /dev/stdout, error info: /dev/stdout: Permission denied while logging request

Steps to Reproduce

Run apisix docker with apisix.yaml:

routes:
  - uri: /*
    upstream_id: 1
    plugins:
      file-logger:
        path: /dev/stdout

upstreams:
  - id: 1
    nodes:
      "host.docker.internal:3000": 1
    type: roundrobin

plugins:
  - name: file-logger
#END

Environment

  • APISIX Docker version: apache/apisix:2.13.0-alpine
  • Host system: Macbook Pro Intel with docker desktop for mac

Contributor guide

Tech stack
docker
Domain
observability
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Basic understanding of Docker and file permissions
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
The issue relates to using /dev/stdout as a file path for the file logger plugin, which fails with a permission denied error. Investigate the file logger plugin's file opening logic in plugins/file logger.lua to understand why /dev/stdout is restricted and consider adding a special case for stdout. Check if the Docker container's user configuration (e.g., in Dockerfile or entrypoint) affects permissions. The issue is assigned but no PR is linked, so review any comments for proposed solutions.
bug: cannot use file-logger to log to stdout · apache/apisix#6797 | Good First Issue