Linux安装Memcached
安装libevent，memcached依赖
# tar xf libevent.1.4.15.tar.gz
# cd libevent-1.4.15
# ./configure --prefix=/usr/local/libevent
# make && make install
# echo '/usr/local/libevent' >> /etc/ld.so.conf.d/libevent.conf
# ldconfig
安装memcached
# tar zxvf memcached-1.4.25.tar.gz
# cd memcached-1.4.25
# ./configure --prefix=/usr/local/memcached --with-libevent=/usr/local/libevent
# make && make install
启动memcached
# /usr/local/memcached/bin/memcached -d -m 512 -u web -l 192.168.1.100 -p 11211 -c 256 -P /var/run/memcached.pid
-d选项是启动一个守护进程
-m是分配给memcached使用的内存数量，单位是MB，我这里是512MB
-u是运行memcached的用户，我这里是web
-l是监听的服务器IP地址，我这里指定了服务器的IP地址192.168.1.100
-p是设置memcache监听的端口
-c选项是最大运行的并发连接数，默认是1024，我这里设置了256，按照你服务器的负载量来设定
-P是设置保存memcached的pid文件，我这里是保存在/var/run/memcached.pid
停止memcached
# kill `cat /var/run/memcached.pid`
重启memcached
# kill -USR2 `cat /var/run/memcached.pid`
安装php的memcached扩展
# tar xf libmemcached-1.0.18.tar.gz
# cd libmemcached-1.0.18
# ./configure --prefix=/usr/local/libmemcached
# make && make install
# echo '/usr/local/libmemcached' >> /etc/ld.so.conf.d/libmemcached.conf
# tar xf memcached-2.2.0.tgz
# cd memcached-2.2.0
# /usr/local/php/bin/phpize
# ./configure --with-php-config=/usr/local/php/bin/php-config --with-libmemcached-dir=/usr/local/libmemcached
# make && make install
将memcached模块添加到php.ini配置文件中
命令不要照搬，不同的环境，路径不一样。
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