(Archived) How to activate Redis for Magento from 1.8

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1 Setup of Redis in Magento
2 Configuration of the local.xml (local.xml.dist)

Setup of Redis in Magento

The Magento Redis module is preinstalled from version 1.8, but deactivated. For activation in the file

Magento-install-dir/app/etc/modules/Cm_RedisSession.xml

simply change option <active> from false to true to enable the module.

Configuration of the local.xml (local.xml.dist)

After the Redis module is activated and installed, the local.xml has to be adapted: Magento-install-dir/app/etc/local.xml with the following entry.

<global>
    <cache>
        <backend>Cm_Cache_Backend_Redis</backend>
        <backend_options>
            <server>%REDIS_HOST%</server> <!-- or absolute path to unix socket for better performance -->
            <port>%REDIS_PORT%</port>
            <database>0</database>
            <password></password>
            <force_standalone>0</force_standalone>  <!-- 0 for phpredis, 1 for standalone PHP -->
            <connect_retries>1</connect_retries>    <!-- Reduces errors due to random connection failures -->
            <automatic_cleaning_factor>0</automatic_cleaning_factor> <!-- Disabled by default -->
            <compress_data>1</compress_data>  <!-- 0-9 for compression level, recommended: 0 or 1 -->
            <compress_tags>1</compress_tags>  <!-- 0-9 for compression level, recommended: 0 or 1 -->
            <compress_threshold>20480</compress_threshold>  <!-- Strings below this size will not be compressed -->
            <compression_lib>gzip</compression_lib> <!-- Supports gzip, lzf and snappy -->
            <persistent>1</persistent> <!-- persistence value, 0: not in use, > 0 used as persistence ID -->
        </backend_options>
    </cache>

    <!-- example of redis session storage -->
    <session_save>db</session_save>
    <redis_session>                       <!-- All options seen here are the defaults -->
        <host>%REDIS_HOST%</host>            <!-- Specify an absolute path if using a unix socket -->
        <port>%REDIS_PORT%</port>
        <password></password>             <!-- Specify if your Redis server requires authentication -->
        <timeout>2.5</timeout>            <!-- This is the Redis connection timeout, not the locking timeout -->
        <persistent></persistent>         <!-- Specify unique string to enable persistent connections. E.g.: sess-db0; bugs with phpredis and php-fpm are known: https://github.com/nicolasff/phpredis/issues/70 -->
        <db>1</db>                        <!-- Redis database number; protection from accidental loss is improved by using a unique DB number for sessions -->
        <compression_threshold>2048</compression_threshold>  <!-- Set to 0 to disable compression (recommended when suhosin.session.encrypt=on); known bug with strings over 64k: https://github.com/colinmollenhour/Cm_Cache_Backend_Redis/issues/18 -->
        <compression_lib>gzip</compression_lib>              <!-- gzip, lzf or snappy -->
        <log_level>1</log_level>               <!-- 0 (emergency: system is unusable), 4 (warning; additional information, recommended), 5 (notice: normal but significant condition), 6 (info: informational messages), 7 (debug: the most information for development/testing) -->
        <max_concurrency>20</max_concurrency>                 <!-- maximum number of processes that can wait for a lock on one session; for large production clusters, set this to at least 10% of the number of PHP processes -->
        <break_after_frontend>5</break_after_frontend>       <!-- seconds to wait for a session lock in the frontend; not as critical as admin -->
        <break_after_adminhtml>30</break_after_adminhtml>
        <bot_lifetime>7200</bot_lifetime>                    <!-- Bots get shorter session lifetimes. 0 to disable -->
    </redis_session>
</global>

The <server> </server> and <port> </port> areas must be filled with placeholders, which are replaced with the current values during deployment.

Ex.:

%REDIS_HOST%
%REDIS_PORT%