WordPress的对象缓存是一种缓存由插件和主题设置的瞬态的方法。默认的WordPress对象缓存使用了MySQL数据库，开发人员一直寻找替代方法来将这些瞬变存储在其他位置，以加快WordPress性能。Redis和Memcached都是用于将瞬态存储在RAM中的对象缓存守护程序。
本教程将展示如何安装Memcached服务器和PHP 7扩展，以便WordPress可以与Memcached服务器交互。
安装Memcached服务器
从存储库安装最新的Memcached守护程序和依赖项。
Ubuntu：
sudo apt install libmemcached* memcached libanyevent-perl libyaml-perl libterm-readkey-perl libevent-dev libsasl2-2 sasl2-bin libsasl2-dev php7.0-dev php7.0-json php-igbinary php-msgpack pkg-config libtool-bin build-essential git -yCentos：
yum install memcached yum install php-memcached为WordPress配置Memcached
备份原始的Memcached配置文件：
sudo mv /etc/memcached.conf /etc/memcached.conf.bak 创建一个新的Memcached配置文件：
sudo nano /etc/memcached.conf粘贴此memcached配置：
# Run memcached as a daemon. This command is implied, and is not needed for the # daemon to run. See the README.Debian that comes with this package for more # information. -d # Log memcached's output to /var/log/memcached logfile /var/log/memcached.log # Be verbose # -v # Be even more verbose (print client commands as well) # -vv # Start with a cap of 64 megs of memory. It's reasonable, and the daemon default # Note that the daemon will grow to this size, but does not start out holding this much # memory -m 50 # Default connection port is 11211 -p 11211 # Run the daemon as root. The start-memcached will default to running as root if no # -u command is present in this config file -u memcache # Specify which IP address to listen on. The default is to listen on all IP addresses # This parameter is one of the only security measures that memcached has, so make sure # it's listening on a firewalled interface. -l 127.0.0.1 # Set unix socket which we put in the folder /var/run/memcached and made memcache user the owner #-s /var/run/memcached/memcached.sock # set permissions for the memcached socket #-a 775 # Limit the number of simultaneous incoming connections. The daemon default is 1024 # -c 1024 # Lock down all paged memory. Consult with the README and homepage before you do this # -k # Activate optimal options -o modernCtrl + X，Y并按Enter保存并退出
打开Memcached init.d配置文件：
sudo nano /etc/default/memcached确定有下面这一行，以便Memcached启动。
# Set this to no to disable memcached. ENABLE_MEMCACHED=yes重新启动Memcached：
sudo service memcached restart安装Memcached PHP 7 PECL扩展
编译Memcached PHP 7 PECL扩展：
sudo apt install php7.0-dev libtool pkg-config php-igbinary php-json php-msgpack -y cd /tmp git clone https://github.com/php-memcached-dev/php-memcached -b php7 cd php-memcached libtoolize phpize ./configure --prefix=/usr --enable-memcached-igbinary --enable-memcached-json --enable-memcached-msgpack sudo make sudo make install为nginx或Apache启用PHP 7扩展
添加memcached扩展：
echo "extension = memcached.so" | sudo tee -a /etc/php/7.0/mods-available/memcached.ini重新启动php7.0-fpm
sudo service php7.0-fpm restart重新启动Apache2或nginx
sudo service apache2 restart安装Memcached WordPress插件（兼容PHP 7.x）
安装并启用插件后，在WordPress后台 “工具 > Memcached”中可以看到以下信息：
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