1.安装memcached:
yum -y install memcached

2.设置memcached开机启动:
chkconfig memcached on

3.立即启动memcached服务:
service memcached start

4.查找memcached安装位置:
rpm -ql memcached

5.查看memcached配置文件:
cat /etc/sysconfig/memcached

6.执行
netstat -tunlp | grep memcached
看到11211端口，说明memcached安装成功

7.安装libmemached:
wget https://launchpad.net/libmemcached/1.0/1.0.18/+download/libmemcached-1.0.18.tar.gz
tar -zxvf libmemcached-1.0.18.tar.gz
cd libmemcached-1.0.18/
./configure –prefix=/usr/lib/libmemcached
make && make install

8.下载memcache扩展包并安装:
wget http://pecl.php.net/get/memcache-2.2.7.tgz
tar -zxvf memcache-2.2.7.tgz
cd memcache-2.2.7
/usr/bin/phpize
./configure –with-php-config=/usr/bin/php-config
(如果失败重新来换作)
./configure –enable-memcache –with-php-config=/usr/bin/php-config –with-zlib-dir

make && make install

修改php文件 vi /etc/php.ini
添加extension = memcache.so

重启 apache
systemctl restart httpd.service #重启apache