View source for Install Redis Full Page Caching for Magento Enterprise

==Install Redis Full Page Caching for Magento Enterprise==
[[File:Img-redis.jpg|frameless|right|Install Redis Full Page Caching Magento Enterprise]]
How to install redis for full page caching?  You see alot of talk about using apc for Magento caching, but if you are looking for a stable caching, then redis is for you.

===1) Install Redis and phpRedis===

This can be done using yum, which makes this step pretty easy.

 yum install redis php-pecl-redis

 service redis start

 chkconfig redis on

Now to verify that redis is chkconfig on

 chkconfig --list redis

===2) Install Cm_Cache_Backend_Redis Magento Extension===

This is the extension that is required on versions of CE 1.7.0.2 and older, as Magento 1.8.0.0 it comes pre installed.

 wget -O Cm_Cache_Backend_Redis.tar.gz https://github.com/colinmollenhour/Cm_Cache_Backend_Redis/tarball/master

 tar xzf Cm_Cache_Backend_Redis.tar.gz 

 cd colinmollenhour-Cm_Cache_Backend_Redis-9bd58d2/

 cp Cm_Cache_Backend_Redis/Cm /path/to/magento/app/code/local/

 cp Cm_Cache_Backend_Redis/lib/Credis /path/to/magento/lib/

 cat > /path/to/magento/app/etc/modules/Cm_Cache.xml <<eof
 <?xml version="1.0" encoding="UTF-8"?>
 <config>
    <modules>
        <Cm_Cache>
            <active>true</active>
            <codePool>local</codePool>
        </Cm_Cache>
    </modules>
 </config>
 eof

===3) Install Credis Library===

Again not needed if you are using Magento 1.8.0.0 or higher, as its already included in the base install

 wget -O credis.tar.gz https://github.com/colinmollenhour/credis/tarball/master

 tar xzf credis.tar.gz

 cd colinmollenhour-credis-5a48ac8/

 cp ./* /path/to/magento/lib/Credis/

 cd /path/to/magento/

 chown -R username. lib/Credis/

 chown -R username. app/code/local/Cm/

 chown -R username. app/etc/modules/Cm_Cache.

===4) Configure Magento to use Redis for Full Page Caching ===

I recommend always making a backup copy of your local.xml file before making any changes to it

 cp app/etc/local.xml app/etc/local.xml-bk-date

Now lets install redis as a backend cache

 vim app/etc/local.xml

Now add the following to your configuration

 <!-- This is a child node of config/global for Magento Enterprise FPC -->
 <full_page_cache>
   <backend>Cm_Cache_Backend_Redis</backend>
   <backend_options>
     <server>127.0.0.1</server> <!-- or absolute path to unix socket -->
     <port>6379</port>
     <persistent></persistent> <!-- Specify unique string to enable persistent connections. E.g.: sess-db
     <database>1</database> <!-- Redis database number; protection against accidental data loss is improved by not sharing databases -->
     <password></password> <!-- Specify if your Redis server requires authentication -->
     <force_standalone>0</force_standalone>  <!-- 0 for phpredis, 1 for standalone PHP -->
     <connect_retries>1</connect_retries>    <!-- Reduces errors due to random connection failures -->
     <lifetimelimit>57600</lifetimelimit>    <!-- 16 hours of lifetime for cache record -->
     <compress_data>0</compress_data>        <!-- DISABLE compression for EE FPC since it already uses compression -->
   </backend_options>
 </full_page_cache>

===Clearning your Magento Cache===

Now the last step is a giving, any time you make any changes to your Magento configuration/template is to clear your sessions and cache.  You do NOT want problems later, because you forgot to clear them and you now find a problem.  Sometimes problems show their heads up to a week or so, so clear cache/session and see if you have any problems/issues.

If you were using files prior to the change

 rm -r /path/magento/var/session/* /path/magento/var/cache/*

If you were using memcache prior to change

 echo "flush_all" | nc 127.0.0.1 11211
 
or if using a sock

 echo "flush_all" | nc -U /path/to/socket

===How to flush your Redis Cache===

Now you will want to flush your redis cache anytime you make a change to your site. The fastest way to do this is to run the following command via the command line.

 echo 'flushall' | redis-cli -h 127.0.0.1 -p 6379

===Add a second instance of Redis===

Redis is single-threaded so it’s performance peaks when it uses one full CPU core. On a multi-core machine (every machine these days) your peak performance with Redis will be higher if you can use multiple cores. Also, there will be no waiting between different processes. E.g. while one process may be fetching the config, another would be waiting to load a session and another would be waiting to load a FPC record. By having each on a separate core you have much higher peak performance and less contention. 

 cp /etc/redis.conf /etc/redis2.conf && cp /etc/init.d/redis /etc/init.d/redis2

'''Change''' 
 vim /etc/init.d/redis2
 pidfile="/var/run/redis/redis.pid" to pidfile="/var/run/redis/redis2.pid"
 REDIS_CONFIG="/etc/redis.conf" to REDIS_CONFIG="/etc/redis2.conf"

'''Change'''
 vim /etc/redis2.conf
 port 6379 to port 6380
 unixsocket /tmp/redis.sock to unixsocket /tmp/redis2.sock

 service redis2 start

'''Let also make this instance start up on boot'''

 chkconfig redis2 on

'''Now verify its set to start at boot'''

 chkconfig --list redis2

 redis2          0:off   1:off   2:on    3:on    4:on    5:on    6:off

===Additioanl Articles===
 --> [[How to install Redis on a Centos 6.4 Server]]
 --> [[Magento Connect is not Working]]
 --> [[Changing the Minimum Search Query - MySQL Full Text Only]]
 --> [[Install Redis Caching for Magento]]
 --> [[Install Redis Full Page Caching for Magento Enterprise]]