修改context.xml
<Context>

    <!-- Default set of monitored resources -->
    <WatchedResource>WEB-INF/web.xml</WatchedResource>

    <!-- Uncomment this to disable session persistence across Tomcat restarts -->
    <!--
    <Manager pathname="" />
    -->

    <!-- Uncomment this to enable Comet connection tacking (provides events
         on session expiration as well as webapp lifecycle) -->
    <!--
    <Valve className="org.apache.catalina.valves.CometConnectionManagerValve" />
    -->
	<Valve className="com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve" />
	<Manager className="com.orangefunction.tomcat.redissessions.RedisSessionManager"
         host="codis.infra.middleware.xueleyun.com" 
         port="9000" 
         database="0" />

</Context>