你可以在配置文件中使用流畅的环境变量 [英] Can you use environment variables in config file for fluentd

问题描述

我想知道如何在Fluentd配置中使用env vars，我试过：

 < match **> 
 type elasticsearch 
 logstash_format true 
 logstash_prefix $ ENV_VAR 
主机*** 
端口*** 
 include_tag_key true 
 tag_key _key 
< / match> 
  

但它不起作用，任何想法？

解决方案

编辑：

这是一个更好的解决方案：

如果您将--use-v1-config选项传递给Fluentd，则可以使用＃{ENV ['env_var_name']这样：

 < match foobar。**> ＃ENV [FOO]是foobar type elasticsearch logstash_prefix＃{ENV ['FOO']}logstash_format true include_tag_key true tag_key _key host **** port ****< / match>  

旧的，kludgey的答案在这里。

1. 安装 fluent-plugin-record-reformer 和 fluent-plugin-forest


2. 如下更新您的配置。

 < match hello 。世界>键入record_reformer标签$ {ENV [FOO]} $ {tag_prefix [-1]}＃将env变量添加为标签前缀< / match>< match foobar。**> ＃ENV [FOO]是foobar类型林子类型elasticsearch< template> logstash_prefix $ {tag_parts [0]} logstash_format true include_tag_key true tag_key _key host **** port ****< / template>< / match>  

具体而言，请勿使用< match **> 。这将捕获所有事件，并将导致难以调试的行为。

I was wondering how to use env vars in the Fluentd config, I tried:

<match **>
type elasticsearch
logstash_format true
logstash_prefix $ENV_VAR
host ***
port ***
include_tag_key true
tag_key _key
</match>

but it doesn't work, any idea?

解决方案

EDIT:

Here is a much better solution:

If you pass "--use-v1-config" option to Fluentd, this is possible with the "#{ENV['env_var_name']" like this:

<match foobar.**> # ENV["FOO"] is foobar
  type elasticsearch
  logstash_prefix "#{ENV['FOO']}"
  logstash_format true
  include_tag_key true
  tag_key _key
  host ****
  port ****
</match>

Old, kludgey answer is here.

1. Install fluent-plugin-record-reformer and fluent-plugin-forest
2. Update your config as follows.

<match hello.world>
  type record_reformer
  tag ${ENV["FOO"]}.${tag_prefix[-1]} # adding the env variable as a tag prefix
</match>

<match foobar.**> # ENV["FOO"] is foobar
  type forest
  subtype elasticsearch
  <template>
    logstash_prefix ${tag_parts[0]}
    logstash_format true
    include_tag_key true
    tag_key _key
    host ****
    port ****
  </template>
</match>

In particular, do NOT use <match **> there. That would catch all events and will lead to behaviors that are hard to debug.

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