一般情况下,软件的漏洞信息和特定版本是相关的,因此,软件的版本号对攻击者来说是很有价值的。
在默认情况下,系统会把Apache版本模块都显示出来(http返回头信息)。如果列举目录的话,会显示域名信息(文件列表正文),如:
[root@localhost conf]# curl -I 192.168.146.188
HTTP/1.1 200 OK
Date: Tue, 30 Aug 2011 09:17:42 GMT
Server: Apache/2.2.4 (Unix) PHP/5.2.6
Last-Modified: Sat, 20 Nov 2004 20:16:24 GMT
ETag: "be0533-2c-3e9564c23b600"
Accept-Ranges: bytes
Content-Length: 44
Content-Type: text/html
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
Comet is a programming technique that enables web servers to send data to the client without having any need for the client to request it. This technique will produce more responsive applications than classic AJAX. In classic AJAX applications, web browser (client) cannot be notified in real time that the server data model has changed. The user must create a request (for example by clicking on a link) or a periodic AJAX request must happen in order to get new data fro the server.
I will now explain how to implement Comet with PHP programming language. I will demonstrate it on two demos which uses two techniques: the first one is based on hidden ”<iframe>” and the second one is based on classic AJAX non-returning request. The first demo will simply show the server date in real time on the clients and the second demo will display a mini-chat.
而且直接配置文件是效率最高的,通过其它驱动效率都相对较低,BDB
这个测试不太准确,看官方的测试结果:http://bind-dlz.sourceforg
为什么使用BDB时QPS这么低? 我在bind版本基本相似的环境中测试的
It is quite useful and interesting too.
VIRT 的上限是64G,也就是36位, cat /proc/cpuinfo的结果是:addre
昨天要准备用线程重写webbench,试验了下Fedora Linux 2.6.35.14
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