logstash官方提供的插件安裝方法是：
bin/plugin install logstash-output-webhdfs
按照此方法，不出意料肯定會出現以下錯誤：
[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牆掉了logstash的默認gem source(類似於CentOS的yum source)；
[ec2-user@ip-xxx-xxx-xxx-xxx logstash-2.3.0]$ cat Gemfile | grep source
source "https://rubygems.org"
需要將gem source修改為國內的源，
[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/" ...... 執行
bin/plugin install logstash-output-webhdfs
一般都能安裝成。
有的插件在淘寶的gem庫中找不到，這時候可以考慮本地安裝的辦法。
先去https://github.com/logstash-plugins下載對應的插件，然后解壓，在logstash的Gemfile中添加一行(以logstash-output-webhdfs為例)：
[ec2-user@ip-xxx-xxx-xxx-xxx logstash-2.3.0]$ vim Gemfile ...... gem "logstash-output-webhdfs", :path => "/home/ec2-user/logstash-output-webhdfs" 執行
bin/logstash-plugin install --no-verify
即可安裝成功
作者：studyz
鏈接：https://www.jianshu.com/p/4fe495639a9a
來源：簡書
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