Install Redis Caching for Magento
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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-*/
cp -r Cm /path/to/magento/app/code/local/
cp -r 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-*/
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.xml
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 for redis using TCP
<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>
If you are using a Socket for your redis instance
<cache> <backend>Cm_Cache_Backend_Redis</backend> <backend_options> <server>/var/tmp/redis-multi_path/to/my.sock</server> <port></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>
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
or
echo 'flushall' | nc -U /path/to/socket
How to Check if your Redis Cache is Working
To verify you are getting connections to your redis instance
echo 'info' | redis-cli -h 127.0.0.1 -p 6379 | grep connections
or
echo 'info' | nc -U /path/to/socket | grep connections
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 --> Basic Redis commands - Cheat Sheet