Tomcat の手前に ReverseProxy を置いた時に、REMOTE_ADDR を proxy ではなく client ip にするための設定です。
まんまこちらの通りなんですが、
http://frmmpgit.blog.fc2.com/blog-entry-145.html
conf/server.xml
<valve classname="org.apache.catalina.valves.RemoteIpValve">
<!-- SingleSignOn valve, share authentication between web applications
Documentation at: /docs/config/valve.html -->
<!--
<valve className="org.apache.catalina.authenticator.SingleSignOn" />
-->
<!-- Access log processes all example.
Documentation at: /docs/config/valve.html
Note: The pattern used is equivalent to using pattern="common" -->
<valve classname="org.apache.catalina.valves.AccessLogValve" directory="logs"
pattern="%h %l %u %t "%r" %s %b" prefix="localhost_access_log." requestAttributesEnabled="true"
suffix=".txt">
</valve>
- RemoteIpValve を追加
- AccessLogValve に requestAttributesEnabled="true" を追加

