php常用的缓存工具：memcached和redis,本文讲的是在magento框架中借助magento的模块来使用redis

• 准备工作
• magento中配置redis
• 可能遇到的问题

准备工作

确保你的电脑安装并启动了redis服务、配置了php的redis扩展
若没有，查看此文《mac下安装配置redis》

magento配置reids

1. 确保magento框架中安装并启用了Cm_Cache_Backend_Redis模块
2. 修改以下路径中的local配置文件
   项目根目录/app/etc/local.xml
   在config/global下添加子节点cache如下

<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-db0; bugs with phpredis and php-fpm are known: https://github.com/nicolasff/phpredis/issues/70 -->
  <database>0</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; a value of 1 will not retry after the first failure -->
  <read_timeout>10</read_timeout>         <!-- Set read timeout duration; phpredis does not currently support setting read timeouts -->
  <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, lz4 (as l4z) and snappy -->
  <use_lua>0</use_lua> <!-- Set to 1 if Lua scripts should be used for some operations -->
</backend_options>
</cache>

3. 清空magento缓存使得配置文件生效，关于如何清空magento缓存，参考《magento二次开发 – 如何清除magento缓存》

可能遇到的问题

6.22:
今天上午打开本地网站时报如下错误connection to Redis failed：

错误页面

发现是因为redis服务没有开启导致的，开启redis即可

说明magento在配置了redis之后那么要保持reids服务一直处于开启状态

参考：
[1]在magento中配置redis文档：

http://devdocs.magento.com/guides/m1x/ce18-ee113/using_redis.html

[2]Cm_Cache_Backend_Redis配置

https://github.com/colinmollenhour/Cm_Cache_Backend_Redis/blob/master/README.md