Using Memcache to implement synchronization session _php technique in Web cluster

Using Memcache to synchronize the session is still good, of course, you can also save the session through Redis, PHP can be opened and the session stored to the Redis cache, The following is the implementation process for setting up synchronization session sessions in a Web cluster using memcache:

1. Analog Web Cluster

I started two memcached processes to simulate two servers, respectively.

/usr/local/bin/memcached-d-M 20-u zhangy-p 12000-p./memcached.pid
/usr/local/bin/memcached-d-M 20-u zhangy-p 13000-p./mem.pid

2, modify the configuration of PHP

Vi/usr/local/php/lib/php.ini

Session.save_handler = "Memcache"
Memcache.hash_strategy = "consistent"
Session.save_path = "tcp://127.0.0.1:13000?weight=10,tcp://127.0.0.1:12000"

Description: The first line, session storage mode is Memcache, the second line, Memcache hash algorithm is consistent, the third line, session storage status;

3, restart Apache

View Phpinfo

Session

Session Support	Enabled
Registered Save handlers	Files User SQLite Memcache
Registered serializer Handlers	PHP php_binary

Immediately following are:

Session.save_path

tcp://127.0.0.1:13000,tcp://127.0.0.1:12000

tcp://127.0.0.1:13000,tcp://127.0.0.1:12000

4, do a simple test as follows:

A), preparation of documents session.php

<?php 
session_start (); 
$_session[' username ' = "abcabc"; 
Echo session_id (); 
? >

b), displaying session content Files

<?php 
$mem = new Memcache; 
$mem->addserver ("127.0.0.1", 12000) or die ("could not add server 12000"); 
$mem->addserver ("127.0.0.1", 13000) or die ("could not add server 13000"); 
$val = $mem->get (' Qp0mrob2ovcqle3u4lbr4obsa5 '); 
Echo session_id (); The resulting session ID
echo $val; 
? >