Use memcache to synchronize sessions

It is good to use memcache to synchronize sessions. Of course, you can also use redis to save sessions. You can enable PHP and store sessions to redis cache, the following describes how to use memcache to synchronize sessions in a Web Cluster:

1. simulate a Web Cluster

I started two memcached processes, simulating 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 PHP configuration

VI/usr/local/PHP/lib/PHP. ini

Session. save_handler = "memcache"
Memcache. hash_strategy = "consistent"
Session. save_path = "TCP: // FIG: 13000? Weight = 10, TCP: // 127.0.0.1: 12000"

Note: In the first line, the session storage method is memcache; in the second line, the hash algorithm of memcache is consistent; in the third line, the 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

 

Next is:

 

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. perform a simple test as follows:

A) Prepare the file session. php

?

12345

<?php session_start(); $_SESSION[‘username‘] = "abcabc"; echo session_id(); ?>

B) display the session Content File

?

12345678

<?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 (); obtains the session ID.echo $val;?>

Use memcache to synchronize sessions