安装fluentd时配置fluent-plugin-elasticsearch发生的错误

我们在进行fluentd，elasticsearch，kibana环境搭建时，fluentd需要es作为存储的平台，这个时候在配置vi /etc/td-agent/td-agent.conf时

1. <match task.**>  
2.   host 192.168.0.1  #####  elasticsearch 服务器地址
3.   type elasticsearch  
4.   logstash_format true  
5.   flush_interval 5s  
6.   include_tag_key true  
7.   tag_key mapred  
8. </match>  

中间涉及到使用elasticsearch，所以我们要安装

fluent-plugin-elasticsearch

/usr/lib64/fluent/ruby/bin/fluent-gem install fluent-plugin-elasticsearch

发生错误：
ERROR:  Error installing fluent-plugin-elasticsearch:
    ERROR: Failed to build gem native extension.

        /usr/lib64/fluent/ruby/bin/ruby extconf.rb
checking for curl-config... no
checking for main() in -lcurl... no
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
    --with-opt-dir
    --without-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=/usr/lib64/fluent/ruby/bin/ruby
    --with-curl-dir
    --without-curl-dir
    --with-curl-include
    --without-curl-include=${curl-dir}/include
    --with-curl-lib
    --without-curl-lib=${curl-dir}/lib
    --with-curllib
    --without-curllib
extconf.rb:39:in `<main>':   Can't find libcurl or curl/curl.h (RuntimeError)

这个是由于我们没有安装 libcurl-devel造成的，我们只要先yum install  libcurl-devel，再次重新
/usr/lib64/fluent/ruby/bin/fluent-gem install fluent-plugin-elasticsearch时就可以顺利进行下去。

如此，fluentd配置成功，可以启动了service td-agent start