Memcached是mysql的K-V缓存插件,可以有效加速mysql,减轻mysql负担
但是这个插件是很占用内存的,小内存慎用.
1首先安装Libevent事件触发管理器。
Memcached依赖Libevent
centos可以直接 yum install libevent-devel libevent
编译可以去下面下载
https://github.com/nmathewson/Libevent/archive/release-2.1.7-rc.tar.gz
2.编译Memcached
wget http://memcached.org/files/memcached-1.4.33.tar.gz tar zvxf memcached-1.4.33.tar.gz cd memcached-1.4.33 ./configure #./configure -with-libevent=/usr/local/libevent make && make install
3 启动Memcached
/usr/local/bin/memcached -d -m 256 -l 127.0.0.1 -p 11211 -u root # (256为内存, 11211为端口,root为用户组)
4 开机/重启后生效，编辑 /etc/rc.d/rc.local 文件，添加以下内容。
echo "/usr/local/bin/memcached -d -m 256 -l 127.0.0.1 -p 11211 -u root" >>/etc/rc.d/rc.local
5 检测
ps aux|grep memcached
来源: http://www.skyoy.com/directadmin-memcache.html
######为PHP添加memcached模块#############
1安装 libmemcached 库
wget https://launchpad.net/libmemcached/1.0/1.0.18/+download/libmemcached-1.0.18.tar.gz tar -zxf libmemcached-1.0.18.tar.gz cd libmemcached-1.0.18 ./configure --prefix=/usr/local/libmemcached --with-memcached #注意：--with-memcached这个选项一定要加上
2 安装完成后，开始安装memcached模块
wget http://pecl.php.net/get/memcached-2.2.0.tgz tar -zxf memcached-2.2.0.tgz cd memcached-2.2.0 #find / -name phpize #找一下phpize 安装位置 #find / -name php-config #找一下php-config安装位置, 注意替换下面的路径 /usr/local/php56/bin/phpize #/usr/local/bin/phpize ./configure --enable-memcached --with-php-config=/usr/local/php56/bin/php-config --with-libmemcached-dir=/usr/local/libmemcached # ./configure --enable-memcached --with-php-config=/usr/bin/php-config --with-libmemcached-dir=/usr/local/libmemcached make && make install
/usr/local/php56/lib/php/extensions/no-debug-non-zts-20131226/
安装完后会有类似这样的提示：
Installing shared extensions: /usr/local/php56/lib/php/extensions/no-debug-non-zts-20131226/
把这个记住，然后修改php.ini，把
extension_dir = './'
修改为
extension_dir = '/usr/local/php56/lib/php/extensions/no-debug-non-zts-20131226/'
并添加一行
extension=memcached.so
php -m #查看memcached模块是否安装
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