the webapplication web.xml can reference previously defined Resources 
(UserDatabase) as here
  <resource-env-ref>
    <description>
      Link to the UserDatabase instance from which we request lists of
      defined role names.  Typically, this will be connected to the global
      user database with a ResourceLink element in server.xml or the context
      configuration file for the Manager web application.
    </description>
    <resource-env-ref-name>users</resource-env-ref-name>
    <resource-env-ref-type>
      org.apache.catalina.UserDatabase
    </resource-env-ref-type>
  </resource-env-ref>

Here is the applicable UserDatabase which can be configured in 
$TOMCAT_HOME/conf/server.xml
 <Resource name="UserDatabase" auth="Container"
              type="org.apache.catalina.UserDatabase"
              description="User database that can be updated and saved"
              factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
              pathname="conf/tomcat-users.xml" />
//pathname can point to any user defined xml
<?xml version='1.0' encoding='utf-8'?>
<tomcat-users>
  <role rolename="role1"/>
  <user username="role1" password="tomcat" roles="role1"/>
</tomcat-users>

HTH
Martin 
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> Date: Tue, 28 Apr 2009 15:10:02 -0700
> Subject: virtual hosts and tomcat-users.xml
> From: cheshira...@gmail.com
> To: users@tomcat.apache.org
> 
> I am setting up a handful of virtual hosts on a server, and I have the
> manager app configured as per the docs. How do I configure the
> security for the manager app such that each virtual host has its own
> tomcat-users.xml though, so that the credentials of one virtual host
> can't be used log on to the manager of another?
> 
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
> For additional commands, e-mail: users-h...@tomcat.apache.org
> 

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