Magento local.xml example for enabling Redis for cache and Memcached for sessions.

local.xml

<?xml version="1.0"?>
<config>

    <global>

        <session_save><![CDATA[memcached]]></session_save>
        <session_save_path><![CDATA[127.0.0.1:11211?persistent=0&weight=2&timeout=10&retry_interval=10]]></session_save_path>

        <cache>
            <backend>Mage_Cache_Backend_Redis</backend>
            <backend_options>
                <server>127.0.0.1</server>
                <port>6379</port>
                <persistent></persistent>
                <database>1</database>
                <password></password>
                <force_standalone>0</force_standalone>
                <connect_retries>3</connect_retries>
                <read_timeout>10</read_timeout>
                <automatic_cleaning_factor>0</automatic_cleaning_factor>
                <compress_data>1</compress_data>
                <compress_tags>1</compress_tags>
                <compress_threshold>20480</compress_threshold>
                <compression_lib>gzip</compression_lib>
                <use_lua>0</use_lua>
            </backend_options>
        </cache>

        <full_page_cache>
            <backend>Mage_Cache_Backend_Redis</backend>
            <backend_options>
                <server>127.0.0.1</server>
                <port>6379</port>
                <persistent></persistent>
                <database>2</database>
                <password></password>
                <force_standalone>0</force_standalone>
                <connect_retries>3</connect_retries>
                <lifetimelimit>57600</lifetimelimit>
                <compress_data>0</compress_data>
            </backend_options>
        </full_page_cache>
    </global>

</config>