yum install -y epel-release

yum install -y libevent memcached libmemcached 

/etc/init.d/memcached start

 

netstat -lnp |grep mem

tcp        0      0 0.0.0.0:11211               0.0.0.0:*                   LISTEN      


1549/memcached

 

ps aux |grep memcached

memcached -d -p 11211 -u memcached -m 64 -c 1024 -P /var/run/memcached/memcached.pid


-d选项是启动一个守护进程

-m是分配给Memcache使用的内存数量，单位是MB，这里是200MB 

-u是运行Memcache的用户，如果当前为 root 的话，需要使用此参数指定用户。 

-l是监听的服务器IP地址

-p是设置Memcache监听的端口，默认是11211

-c选项是最大运行的并发连接数，默认是1024

-P是设置保存Memcache的pid文件 



相关的参数在vim /etc/init.d/memcached 

 vim /etc/sysconfig/memcached

PORT="11211"

USER="memcached"

MAXCONN="1024"

CACHESIZE="128"

OPTIONS="-l 192.168.1.124"

 

查看memcached运行状态

 memcached-tool 127.0.0.1:11211 stats  

或者 echo stats |nc 127.0.0.1 11211 yum install -y nc

 若安装libmemcached后，可以使用命令

memstat --servers=127.0.0.1:11211   查看memcached服务状态




[root@bogon ~]# telnet 192.168.1.124 11211

Trying 192.168.1.124...

Connected to 192.168.1.124.

Escape character is '^]'.

set key1 0(标记） 300 3

asd

STORED

get key1

VALUE key1 0 3

asd

END

set key2 111 20 5

asdfg

STORED

get key2

VALUE key2 111 5

asdfg

END


[root@bogon ~]# memcached-tool 192.168.1.124:11211 display

  #  Item_Size  Max_age   Pages   Count   Full?  Evicted Evict_Time OOM

  1      96B       330s       1       2      no        0        0    0



\r\n \r\n

可以是”set”, “add”, “replace”。

set”表示按照相应的存储该数据

，没有的时候增加，有的覆盖。

add”表示按照相应的添加该数据,但是如果该已>经存在则会操作失败。

replace”表示按照相应的替换数据,但是如果该不存在则操作失败。



PHP连接Memcached



PHP连接Memcached

先安装php的memcache扩展

tar zxf memcache-2.2.3.tgz 

cd memcache-2.2.3

/usr/local/php/bin/phpize

./configure --with-php-config=/usr/local/php/bin/php-config

make && make install

安装完后会有类似这样的提示：

installing shared extensions: /usr/local/php/lib/php/extensions/no-debug-non-zts-

20090626/

把这个记住，

vim /usr/local/php/etc/php.ini

然后修改php.ini，把 extension_dir = "./" 修改为xtension_dir = "/usr/local/php/ext"

mkdir /usr/local/php/ext

cp /usr/local/php/lib/php/extensions/no-debug-non-zts-20090626/memcache.so 


usr/local/php/ext

vim /usr/local/php/etc/php.ini

并添加一行extension="memcache.so"


/usr/local/php/bin/php -m 查看是否有没有memcache.so 


下载测试php脚本


/usr/local/php/bin/php 1.php

//连接Memcache Memcache

$mem = new Memcache;

$mem->connect("localhost", 11211);

//保存数据

$mem->set('key1', 'This is first value', 0, 60);

$val = $mem->get('key1');

echo "Get key1 value: " . $val ."
";

//替换数据

$mem->replace('key1', 'This is replace value', 0, 60);

$val = $mem->get('key1');

echo "Get key1 value: " . $val . "
";

//保存数组数据

$arr = array('aaa', 'bbb', 'ccc', 'ddd');

$mem->set('key2', $arr, 0, 60);

$val2 = $mem->get('key2');

echo "Get key2 value: ";

print_r($val2);

echo "
";

//删除数据

$mem->delete('key1');

$val = $mem->get('key1');

echo "Get key1 value: " . $val . "
";

//清除所有数据

$mem->flush();

$val2 = $mem->get('key2');

echo "Get key2 value: ";

print_r($val2);

echo "
";

//关闭连接

$mem->close();

?>



memcached实现session共享

本实例是在lamp/lnmp环境下实现

编辑php.ini添加两行

session.save_handler = "memcache"

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

或者httpd.conf中对应的虚拟主机中添加

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

php_value[session.save_handler] = memcache

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


session.save_path =  如果memcached在其他的服务器上那么就写远程服务器的ip



Memcached session测试

mv .mem_se.txt  /usr/local/apache2/htdocs/session.php

session_start();

if (!isset($_SESSION['TEST'])) {

$_SESSION['TEST'] = time();

}

$_SESSION['TEST3'] = time();

print $_SESSION['TEST'];

print "

";

print $_SESSION['TEST3'];

print "

";

print session_id();

?>


curl localhost/session.php

类似于1443702394

1443702394

i44nunao0g3o7vf2su0hnc5440

telnet 127.0.0.1 11211

get i44nunao0g3o7vf2su0hnc5440