Fluentd作為一個日志收集系統，其用戶還是非常大的，可是安裝Fluentd的步驟非常繁瑣，許多人在安裝的時候就遇到了難題，下面小編就給大家介紹下RedHat安裝Fluentd的方法。
下載fluentd安裝包並解壓
tar zxvf fluentd-0.10.6.tar.gz
cd fluentd-0.10.6
。/configure
make
切換到root賬號
make install
提示如下
rake aborted！
Unable to determine name from existing gemspec. Use ：name =》 ‘gemname’ in #install_tasks to manually set it.
/usr/local/lib/fluent/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.2.1/lib/bundler/gem_helper.rb:30:in `initialize‘
/usr/local/lib/fluent/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.2.1/lib/bundler/gem_helper.rb:14:in `new’
/usr/local/lib/fluent/ruby/lib/ruby/gems/1.9.1/gems/bundler-1.2.1/lib/bundler/gem_helper.rb:14:in `install_tasks‘
/home/aircom/fluentd-0.10.6/Rakefile:6：in `《top （required）》’
/usr/local/lib/fluent/ruby/lib/ruby/1.9.1/rake.rb:2373:in `load‘
/usr/local/lib/fluent/ruby/lib/ruby/1.9.1/rake.rb:2373:in `raw_load_rakefile’
/usr/local/lib/fluent/ruby/lib/ruby/1.9.1/rake.rb:2007:in `block in load_rakefile‘
/usr/local/lib/fluent/ruby/lib/ruby/1.9.1/rake.rb:2058:in `standard_exception_handling’
/usr/local/lib/fluent/ruby/lib/ruby/1.9.1/rake.rb:2006:in `load_rakefile‘
/usr/local/lib/fluent/ruby/lib/ruby/1.9.1/rake.rb:1991:in `run’
-e:1：in `《main》‘
make： *** ［install］ Error 1
安裝ruby
rz ruby-1.9.3-p0.tar.gz
tar zxvf ruby-1.9.3-p0.tar.gz
cd ruby-1.9.3-p0
。/configure
make
make install
驗證ruby
［root@Server201 ruby-1.9.3-p0］# ruby -v
得到提示信息
ruby 1.9.3p0 （2011-10-30 revision 33570） ［x86_64-linux］
執行安裝
gem install fluentd
提示如下，不必理會，等待安裝，稍等一會兒（視網絡情況）可看到安裝進度。
/usr/local/lib/ruby/1.9.1/yaml.rb:56:in `《top （required）》’：
It seems your ruby installation is missing psych （for YAML output）。
To eliminate this warning， please install libyaml and reinstall your ruby.
命令執行完之後
執行fluentd --setup
提示Installed /etc/fluent/fluent.conf.
執行fluentd -c fluent.conf -vv &
輸出
2012-09-27 17:45:16 +0800： fluent/supervisor.rb:153:supervise： starting fluentd-0.10.26
2012-09-27 17:45:16 +0800： fluent/supervisor.rb:235:read_config： reading config file path=“fluent.conf”
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered buffer plugin ‘file’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered buffer plugin ‘memory’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered input plugin ‘debug_agent’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered input plugin ‘exec’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered input plugin ‘forward’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered input plugin ‘gc_stat’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered input plugin ‘http’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered input plugin ‘object_space’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered input plugin ‘status’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered input plugin ‘tcp’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered input plugin ‘unix’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered input plugin ‘syslog’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered input plugin ‘tail’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered output plugin ‘copy’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered output plugin ‘exec’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered output plugin ‘exec_filter’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered output plugin ‘file’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered output plugin ‘forward’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered output plugin ‘null’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered output plugin ‘roundrobin’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered output plugin ‘stdout’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered output plugin ‘tcp’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered output plugin ‘unix’
2012-09-27 17:45:16 +0800： fluent/plugin.rb:89:register_impl： registered output plugin ‘test’
2012-09-27 17:45:16 +0800： fluent/engine.rb:65:block in configure： adding source type=“forward”
2012-09-27 17:45:16 +0800： fluent/engine.rb:65:block in configure： adding source type=“http”
2012-09-27 17:45:16 +0800： fluent/engine.rb:81:block in configure： adding match pattern=“debug.**” type=“stdout”
2012-09-27 17:45:16 +0800： plugin/in_forward.rb:61:listen： listening fluent socket on 0.0.0.0:24224
2012-09-27 17:45:16 +0800： plugin/in_http.rb:74:start： listening http on 0.0.0.0:8888
驗證監聽端口
netstat -na | grep 88
tcp 0 0 0.0.0.0:8888 0.0.0.0：* LISTEN
tcp 0 0 127.0.0.1:48241 127.0.0.1:8888 TIME_WAIT
udp 0 0 ：：：58872 ：：：*
unix 2 ［ ］ DGRAM 9880
unix 2 ［ ］ DGRAM 8859
unix 2 ［ ］ DGRAM 8846
unix 2 ［ ］ DGRAM 8806
發送數據驗證
echo ‘{“json”：“message”}’|fluent-cat debug.test
得到輸出
2012-09-27 17:45:32 +0800： plugin/in_forward.rb:140:initialize： accepted fluent socket object_id=95324080
2012-09-27 17:45:32 +0800 debug.test： {“json”：“message”}
2012-09-27 17:45:32 +0800： plugin/in_forward.rb:181:on_close： closed fluent socket object_id=95324080
至此安裝全部完成。
上面就是RedHat安裝Fluentd的介紹了，安裝的時候需要聯網，采用的是在線安裝，當然你也可以先安裝ruby，不影響Fluentd的安裝。