Install Redis Caching for Magento

Install Redis Caching for Magento

How to install redis for backend caching? You see alot of talk about using apc and memcached for Magento caching, but if you are looking for a more 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

Now comes the fun part, you are going to need to setup redis in your local.xml file.

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

<cache>
  <backend>Cm_Cache_Backend_Redis</backend>
  <backend_options>
    <server>127.0.0.1</server> 
    <port>6379</port>
    <persistent></persistent> 
    <password></password> 
    <force_standalone>0</force_standalone>  
    <connect_retries>1</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>