前提条件：安装了memcache server以及rails的客户端memcache-client
修改environment.rb:
找到config.action_controller.session_store = :active_record_store改为
config.action_controller.session_store = :active_record_store
然后再最后加上：
memcache_options = {
:compression => true,
:debug => false,
:namespace => "mem-#{RAILS_ENV}",
:readonly => false,
:urlencode => false
}
memcache_servers = [ '192.168.100.231:11211' ]
CACHE = MemCache.new(memcache_options)
CACHE.servers = memcache_servers
ActionController::Base.session_options[:cache] = CACHE
修改好后，以debug模式启动memcahce server
/usr/local/weip/memcached-1.2.1/bin/memcached -vv -l 192.168.100.231 -p 11211 -m 256 -P /tmp/memcached.pid -u root
你会看到：
。。。。。。
<3 server listening
再启动你的rails应用
访问页面，你会看到memcache server的确有动静：
。。。。。。。。。。
slab class 40: chunk size 504692 perslab 2
<3 server listening
<6 new client connection
<6 set mem-test:test 0 -1 84
>6 STORED
<6 get mem-test:test
>6 END
<6 set mem-test:test 0 0 84
>6 STORED
<6 get mem-test:test
>6 sending key mem-test:test
>6 END
