logstash - 如何在logstash配置文件中引用环境变量？

Question

是否可以在 logstash 配置中引用环境变量？

就我而言，我想让我在环境中设置的 Elasticsearch 地址可配置。

Answer 1

使用 logstash 2.3，您可以使用 ${var} 或 $var 将环境变量引用设置到 Logstash 插件配置中。
https://www.elastic.co/guide/en/logstash/current/environment-variables.html

在 logstash 2.3 之前，您可以使用社区维护的“环境”过滤器插件。

文档位于:https://www.elastic.co/guide/en/logstash/current/plugins-filters-environment.html#plugins-filters-environment-add_field_from_env

如何安装此插件:

$LOGSTASH_HOME/bin/plugin install logstash-filter-environment

源代码: https://github.com/logstash-plugins/logstash-filter-environment

主要部分是:

# encoding: utf-8
require "logstash/filters/base"
require "logstash/namespace"


# Set fields from environment variables
class LogStash::Filters::Environment < LogStash::Filters::Base
  config_name "environment"

  # Specify a hash of fields to the environment variable
  # A hash of matches of `field => environment` variable
  config :add_field_from_env, :validate => :hash, :default => {}

  public
  def register
    # Nothing
  end # def register

  public
  def filter(event)
    return unless filter?(event)
    @add_field_from_env.each do |field, env|
      event[field] = ENV[env]
    end
    filter_matched(event)
  end # def filter
end # class LogStash::Filters::Environment