Modifying shibboleth to use a memcached session backend

shibboleth2.xml

<SPConfig xmlns="urn:mace:shibboleth:3.0:native:sp:config"
    xmlns:conf="urn:mace:shibboleth:3.0:native:sp:config"
    clockSkew="180">

    <OutOfProcess tranLogFormat="%u|%s|%IDP|%i|%ac|%t|%attr|%n|%b|%E|%S|%SS|%L|%UA|%a">
        <Extensions>
            <Library path="memcache-store.so" fatal="true"/>
        </Extensions>
    </OutOfProcess>

    <StorageService type="MEMCACHE" id="mc" prefix="shib:">
        <Hosts>
            HOST:11211
        </Hosts>
    </StorageService>

    <StorageService type="MEMCACHE" id="mc-ctx" prefix="shib:" buildMap="1">
        <Hosts>
            HOST:11211
        </Hosts>
    </StorageService>

    <SessionCache type="StorageService" StorageService="mc-ctx" cacheAssertions="false"
        cacheAllowance="3600" inprocTimeout="900" cleanupInterval="900"/>
    <ReplayCache StorageService="mc"/>
    <ArtifactMap StorageService="mc" artifactTTL="180"/>

    <!-- The rest of the usual shibboleth2.xml continues here -->