Logstash无法创建管道，请求协助排查启动失败及代码定位问题

Let's break down how to track down that problematic line 39, since Logstash merges all files in conf.d alphabetically when loading configurations:

• First, generate the full merged config with debug output
  Run Logstash in config test mode with debug logging—this will spit out the complete merged configuration file that Logstash is actually trying to parse, including line numbers. Use this command:

  logstash -f /path/to/your/conf.d --config.test_and_exit --debug
  

  Look through the debug output for the merged config section, then jump directly to line 39. This will show you exactly what code is causing the issue, and you can cross-reference it back to your individual .conf files.

• Estimate which file contains line 39 using file order and line counts
  Logstash merges files in ASCII order (e.g., 00-inputs.conf comes before 01-filters.conf, a.conf comes before b.conf). First list your files in the order Logstash reads them:

  ls -v /path/to/conf.d
  

  Then count lines in each file sequentially:

  wc -l /path/to/conf.d/*.conf
  

  Add up the line counts until you hit the range that includes line 39. For example, if 00-inputs.conf has 25 lines and 01-filters.conf has 20 lines, line 39 falls in 01-filters.conf (25 + 14 = 39).

• Manually merge files to inspect line 39 directly
  If the debug command doesn't work for you, manually merge the files in the correct order and extract line 39:

  # Merge files in sorted order into a temp file
  cat $(ls -v /path/to/conf.d) > merged_logstash.conf
  # Print line 39
  sed -n '39p' merged_logstash.conf
  

  Once you see the content of line 39, check your individual .conf files to find where that snippet lives.

• Cross-reference with the error message
  Don't forget to pair this with the exact error from logstash-plain.log—common issues in v5.6.5 include invalid grok patterns, missing closing braces in conditionals, or incompatible plugin parameters. The error text will usually tell you why line 39 is failing (e.g., expected one of #, {, } at line 39, column 12), which makes fixing it much faster.

内容的提问来源于stack exchange，提问作者user8981307