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SPLUNK_HOSTNAME variable doesn't set the hostname

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评估

难度
3/5
预计耗时
1-2 天
新手友好度
55/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
冷清
技术栈
docker
领域
devops, infrastructure

调研方向

Reproduce the issue with the supplied compose YAML and .env file using the Splunk Universal Forwarder 9.4.12 image. Start by tracing how SPLUNK_HOSTNAME is handled during container startup and compare it with SPLUNK_BEFORE_START_CMD=set default-hostname REDACTED. Done means the environment variable sets the hostname, or the documented workaround is made explicit.

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描述

I tried looking in /etc/hostname, a btool of server and inputs configs, and I can't find the value I set for SPLUNK_HOSTNAME. This is using the version 9.4.12 of the UF image on dockerhub, here's my redacted config file:

splunk:
  role: splunk_universal_forwarder
  service_name: SplunkForwarder
  conf:
    - key: inputs
      value:
        directory: /opt/splunkforwarder/etc/system/local
        content:
          default:
            _meta: "org_id::CHANGEME"
    - key: server
      value:
        directory: /opt/splunkforwarder/etc/system/local
        content:
          deployment:
            pass4SymmKey: REDACTED

And my ENV file:

DEPLOYMENT_SYMM_REPLACE=REDACTED
SPLUNK_BEFORE_START_CMD=add forward-server REDACTED:9997 -client-cert /mnt/certs/cert.pem -ssl-root-ca-path /mnt/certs/cacert.pem -ssl-verify-server-cert true
SPLUNK_PASSWORD=REDACTED
SPLUNK_HOSTNAME=REDACTED
DEBUG=true

And my compose yaml:

version: '3.8'

services:
  busybox-app:
    image: busybox:latest
    container_name: busybox-app
    command: >
      sh -c '
        mkdir -p /var/log/busybox &&
        counter=1 &&
        while true; do
          echo "$$(date +"%Y-%m-%d %H:%M:%S") [ID:$$counter] Test message unique string buffalo" >> /var/log/busybox/busy.log;
          counter=$$((counter + 1));
          sleep 5;
        done
      '
    volumes:
      - shared-logs:/var/log/busybox
    restart: unless-stopped

  splunk-forwarder:
    image: splunk/universalforwarder:9.4.12
    container_name: splunk-forwarder
    env_file: ./.env
    environment:
      SPLUNK_ADD: "monitor /var/log/busybox/busy.log -sourcetype generic_single_line -index main"
      SPLUNK_START_ARGS: --accept-license
    volumes:
      - shared-logs:/var/log/busybox
      # Only needed if overwriting config
      - ./configs.yml:/tmp/defaults/default.yml
      - ./certs/:/mnt/certs/
    depends_on:
      - busybox-app
    restart: unless-stopped

volumes:
  shared-logs:

For people looking at this in the future, the workaround is to use the splunk set default-hostname command in your env file:

SPLUNK_BEFORE_START_CMD=set default-hostname REDACTED
主要语言
Python
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环境准备

  • 没有 Dockerfile 或 Docker Compose 文件
  • 没有 Pull Request 模板
  • 阅读贡献指南

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  3. Fork 仓库，在一个分支上完成修改。
  4. 提交 Pull Request，并在描述里引用这个 Issue 编号。

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