logstash官方提供的插件安装方法是：
bin/plugin install logstash-output-webhdfs
按照此方法，不出意料肯定会出现以下错误：
[ec2-user@ip-xxx-xxx-xxx-xxx logstash-2.3.0]$ bin/plugin install --no-verify logstash-output-webhdfs The use of bin/plugin is deprecated and will be removed in a feature release. Please use bin/logstash-plugin. Installing logstash-output-webhdfs Error Bundler::InstallError, retrying 1/10 An error occurred while installing snappy (0.0.12), and Bundler cannot continue. Make sure that `gem install snappy -v '0.0.12'` succeeds before bundling. WARNING: SSLSocket#session= is not supported WARNING: SSLSocket#session= is not supported WARNING: SSLSocket#session= is not supported 原因是：GFW墙掉了logstash的默认gem source(类似于CentOS的yum source)；
[ec2-user@ip-xxx-xxx-xxx-xxx logstash-2.3.0]$ cat Gemfile | grep source
source "https://rubygems.org"
需要将gem source修改为国内的源，
[ec2-user@ip-xxx-xxx-xxx-xxx logstash-2.3.0]$ vim Gemfile # This is a Logstash generated Gemfile. # If you modify this file manually all comments and formatting will be lost. #source "https://rubygems.org" source "https://ruby.taobao.org/" ...... 执行
bin/plugin install logstash-output-webhdfs
一般都能安装成。
有的插件在淘宝的gem库中找不到，这时候可以考虑本地安装的办法。
先去https://github.com/logstash-plugins下载对应的插件，然后解压，在logstash的Gemfile中添加一行(以logstash-output-webhdfs为例)：
[ec2-user@ip-xxx-xxx-xxx-xxx logstash-2.3.0]$ vim Gemfile ...... gem "logstash-output-webhdfs", :path => "/home/ec2-user/logstash-output-webhdfs" 执行
bin/logstash-plugin install --no-verify
即可安装成功
作者：studyz
链接：https://www.jianshu.com/p/4fe495639a9a
来源：简书
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