Installation of gems for td-agent

I needed a fluent-plugin for my plugin in order to run on td-agent. td-agent has complete runtime of Ruby, we should install gems to the GEM_HOME td-agent refers.

 $ cat `which td-agent`
 #!/usr/lib64/fluent/ruby/bin/ruby
 ENV["GEM_HOME"]="/usr/lib64/fluent/ruby/lib/ruby/gems/1.9.1/"
 ...

Seeing the script¹ to launch, it says the GEM_HOME.

So when you install gems td-agent uses, set GEM_HOME like this.

 export GEM_HOME="/usr/lib64/fluent/ruby/lib/ruby/gems/1.9.1/"
 gem install mysql2-cs-bind --no-ri --no-rdoc

td-agent will recognize it.

1:the version was td-agent-1.1.11-0.x86_64