symfony/src/Symfony/Bundle/FrameworkBundle/Resources/config/session.xml

<?xml version="1.0" ?>

<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">

    <parameters>
        <parameter key="session.class">Symfony\Component\HttpFoundation\Session\Session</parameter>
        <parameter key="session.flashbag.class">Symfony\Component\HttpFoundation\Session\Flash\AutoExpireFlashBag</parameter>
        <parameter key="session.attribute_bag.class">Symfony\Component\HttpFoundation\Session\Attribute\AttributeBag</parameter>
        <parameter key="session.storage.native_file.class">Symfony\Component\HttpFoundation\Session\Storage\NativeFileSessionStorage</parameter>
        <parameter key="session.storage.null.class">Symfony\Component\HttpFoundation\Session\Storage\NullSessionStorage</parameter>
        <parameter key="session.storage.native_memcache.class">Symfony\Component\HttpFoundation\Session\Storage\NativeMemcacheSessionStorage</parameter>
        <parameter key="session.storage.native_memcached.class">Symfony\Component\HttpFoundation\Session\Storage\NativeMemcachedSessionStorage</parameter>
        <parameter key="session.storage.native_sqlite.class">Symfony\Component\HttpFoundation\Session\Storage\NativeSqliteSessionStorage</parameter>
        <parameter key="session.storage.memcache.class">Symfony\Component\HttpFoundation\Session\Storage\MemcacheSessionStorage</parameter>
        <parameter key="session.storage.memcached.class">Symfony\Component\HttpFoundation\Session\Storage\MemcachedSessionStorage</parameter>
        <parameter key="session.storage.mock_file.class">Symfony\Component\HttpFoundation\Session\Storage\MockFileSessionStorage</parameter>
        <parameter key="session.memcache.class">Memcache</parameter>
        <parameter key="session.memcached.class">Memcached</parameter>

        <parameter key="session_listener.class">Symfony\Bundle\FrameworkBundle\EventListener\SessionListener</parameter>
    </parameters>

    <services>
        <service id="session" class="%session.class%">
            <argument type="service" id="session.storage" />
            <argument type="service" id="session.attribute_bag" />
            <argument type="service" id="session.flash_bag" />
        </service>

        <service id="session.flash_bag" class="%session.flashbag.class%" public="false" />
        <service id="session.attribute_bag" class="%session.attribute_bag.class%" public="false" />
        <service id="session.memcache" class="%session.memcache.class%" public="false" />
        <service id="session.memcached" class="%session.memcached.class%" public="false" />

        <service id="session.storage.mock_file" class="%session.storage.mock_file.class%" public="false">
            <argument>%kernel.cache_dir%/sessions</argument>
            <argument>%session.storage.options%</argument>
        </service>

        <service id="session.storage.native_file" class="%session.storage.native_file.class%" public="false">
            <argument>%kernel.cache_dir%/sessions</argument>
            <argument>%session.storage.options%</argument>
        </service>

        <service id="session.storage.native_memcache" class="%session.storage.native_memcache.class%" public="false">
            <argument>tcp://127.0.0.1:11211?persistent=0</argument>
            <argument>%session.storage.options%</argument>
        </service>

        <service id="session.storage.native_memcached" class="%session.storage.native_memcached.class%" public="false">
            <argument>127.0.0.1:11211</argument>
            <argument>%session.storage.options%</argument>
        </service>

        <service id="session.storage.memcache" class="%session.storage.memcache.class%" public="false">
            <argument type="service" id="session.memcache" />
            <argument>tcp://127.0.0.1:11211?persistent=0</argument>
            <argument>%session.storage.options%</argument>
        </service>

        <service id="session.storage.memcached" class="%session.storage.memcached.class%" public="false">
            <argument type="service" id="session.memcached" />
            <argument>tcp://127.0.0.1:11211?persistent=0</argument>
            <argument>%session.storage.options%</argument>
        </service>

        <service id="session.storage.native_sqlite" class="%session.storage.native_sqlite.class%" public="false">
            <argument>%kernel.cache_dir%/sf2_sqlite_sess.db</argument>
            <argument>%session.storage.options%</argument>
        </service>

        <service id="session.storage.null" class="%session.storage.null.class%" public="false">
            <argument>%session.storage.options%</argument>
        </service>

        <service id="session_listener" class="%session_listener.class%">
            <tag name="kernel.event_subscriber" />
            <argument type="service" id="service_container" />
        </service>
    </services>
</container>