服务器的大用户量的承载方案
一、前言
二、编译安装
三、 安装MySQL、memcache
四、 安装Apache、PHP、eAccelerator、php-memcache
五、 安装Squid
六、后记

MCrypt
MCrypt is a replacement for the old crypt() package and crypt(1) command, with extensions. It allows developers to use a wide range of encryption functions, without making drastic changes to their code. It allows users to encrypt files or data streams without having to be cryptographers. Above all, it allows you to have some really neat code on your machine. :)

The companion to MCrypt is Libmcrypt, which contains the actual encryption functions themselves, and provides a standardized mechanism for accessing them.

Mhash:

Mhash is a free (under GNU Lesser GPL) library which provides a uniform interface to a large number of hash algorithms. These algorithms can be used to compute checksums, message digests, and other signatures.
The HMAC support implements the basics for message authentication, following RFC 2104. In the later versions some key generation algorithms, which use hash algorithms, have been added. The manpage for mhash is mhash.3.html.

At the time of writing this, the library supports the algorithms:

SHA1, SHA160, SHA192, SHA224, SHA384, SHA512, HAVAL128, HAVAL160, HAVAL192, HAVAL224, HAVAL256, RIPEMD128, RIPEMD256, RIPEMD320, MD4, MD5, TIGER, TIGER128, TIGER160, ALDER32, CRC32, CRC32b, WHIRLPOOL, GOST, SNEFRU128, SNEFRU256

　　在生产应用中，某台“Nginx+PHP+MySQL”接口数据服务器，扮演的角色十分重要，如果服务器硬件或Nginx、MySQL发生故障，而短时间内无法恢复，后果将非常严重。为了避免单点故障，我设计了此套方案，编写了failover.sh脚本，实现了双机互备、全自动切换，故障转移时间只需几十秒。

　　操作系统：Linux

　　安装及配置eaccelerator-0.9.5加速PHP-5.2.1

LAMP 系统性能调优，第 1 部分: 理解 LAMP 架构
LAMP 系统的工作原理、性能度量方法及底层操作系统的调优方法

LAMP 系统性能调优，第 2 部分: 优化 Apache 和 PHP
是什么降低了 Apache 的速度，如何使 PHP 发挥最大效力

LAMP 系统性能调优，第 3 部分: MySQL 服务器调优
利用服务器的几个调优技巧，让 MySQL 服务器飞速运行

How to implement COMET with PHP