1、memcached命令行

telnet 127.0.0.1 11211
set key2 0 30 2
ab
STORED
get key2
VALUE key2 0 2
ab
END

 如：

set key3 1 100 4
abcd
STORED
get key3
VALUE key3 1 4
abcd
END
replace key3 1 200 5
abcdx
STORED
get key3
VALUE key3 1 5
abcdx
END
delete key3
DELETED
get key3
END

2、memcached数据导出和导入

 
查看状态：

然后导出：

导入：

memcached-tool 127.0.0.1:11211 dump

注意，在导入的时候，会有过期时间，所以，在导入的时候，要调时间值，否则导入后，就没有数据

3、php连接memcache

先安装php的memcache扩展
cd /usr/local/src/
 wget -c http://pecl.php.net/get/memcache-2.2.7.tgz  (php5最新稳定版)
wget -c http://pecl.php.net/get/memcache-3.0.8.tgz (php5最新开发版)
wget -c https://github.com/websupport-sk/pecl-memcache/archive/php7.zip （php7可用版）
解压：tar zxf memcache****.tgz
cd memcache***
/usr/local/php7fpm/bin/phpize
./configure --with-php-config=/usr/local/php7fpm/bin/php-config
make && make install
安装完后会有类似这样的提示：Installing shared extensions: /usr/local/php7fpm/lib/php/extensions/no-debug-non-zts-20170718/
然后修改php.ini添加一行echo "extension=memcache.so" >>/usr/local/php7fpm/etc/php.ini
检查/usr/local/php7fpm/bin/php-fpm -m

php安装memcached:

wget -c https://pecl.php.net/get/memcached-3.0.4.tgz
tar -xvf memcached-3.0.4.tgz
cd memcached-3.0.4/
/usr/local/php7fpm/bin/phpize
./configure
若缺libmemcached 需要安装这两个依赖包：yum install libmemcached libmemcached-devel
./configure
make && make install
echo "extension=memcached.so" >>/usr/local/php7fpm/etc/php.ini
/etc/init.d/php7fpm restart

具体相关：

测试：url www.apelearn.com/study_v2/.memcache.txt > 1.php 2>/dev/null
/usr/local/php7fpm/bin/php 1.php

4、php的session存储到memcached

编辑php.ini添加两行
for memcache:
session.save_handler = memcache
session.save_path="tcp://192.168.0.9:11211"
for memcahed:
session.save_handler = memcached
session.save_path = "localhost:11211" 或 session.save_path = "127.0.0.1:11211"

或者httpd.conf中对应的虚拟主机中添加
for memcache:
php_value session.save_handler "memcache"

php_value session.save_path"tcp://192.168.0.9:11211"

或者php-fpm.conf对应的pool中添加

for memcache:

php_value[session.save_handler]=memcache
php_value[session.save_path]="tcp://192.168.0.9:11211"

for memcahed:

php_value[session.save_handler] = memcached
php_value[session.save_path] = "127.0.0.1:11211" 或 php_value[session.save_path] = "localhost:11211"

测试：
wget http://study.lishiming.net/.mem_se.txt
mv .mem_se.txt /usr/local/apache2/htdocs/session.php

telnet 127.0.0.1 11211

for memcahed: