YangFei Zheng suziewong

Apache

安全方面

1.勤打补丁[没经验,能先用好就不错了]

2.伪装版本

修改httpd.conf

ServerSignature off

Tcpdump

看了蛮久的tcpdump，也一直很想尝试抓包这类的技能。

tcpdump

-i 指定监听网卡 lo eth0
-c 数量
-w xxx.cap(直接是wireshark的2进制文件)

-A ACSII显示内容

私有地址（Private address）属于非注册地址，专门为组织机构内部使用。

私有网段是:

A类 10.0.0.0 --10.255.255.255
B类 172.16.0.0--172.31.255.255
C类 192.168.0.0--192.168.255.255

还有一个特殊的IP地址，就是127网段的，这是测试地址，即不属于公网，也不属于私网.

通过本机的81号端口访问测试服务器89的我的私人apache目录(端口为11063)

使用本地转发，在本机上输入

ssh -L 81:210.32.200.89:11063 [email protected]

这时候打开浏览器,输入地址127.0.0.1:81 我同时也试验了

ssh -L 81:127.0.0.1:11063 [email protected]

ssh -L 81:localhost:11063 [email protected]

Cookie是保存在客户端的信息，是一种在远程浏览器储存数据并以此来跟踪和识别用户的机制。PHP的http协议的头信息里发送cookie，因此setcookie()函数必须在其他信息输出前调用，和header()函数的限制类似。

Session是保存在服务器端的信息，从这个角度，session比cookie更安全。当会话创建时，服务器返回客户端一个加密的session_id 以标识用户身份，浏览器关闭时，session会销毁，从而session存的值就没有了。

a)在子类中常用到这两个对像。他们的主要区别在于self可以调用父类中的公有或受保护的属性，但parent不可以调用

b).self:: 它表示当前类的静态成员(方法和属性)　与 $this　不同,$this是指当前对像附代码：

Bash Shell启动方式与rc脚本

Shell的不同分类

根据启动Bash Shell的方式不同，对Shell有两种分类方式

登录Shell与非登录Shell

根据Shell的启动方式不同，可以将Shell分为

Stevey's Google Platforms Rant

I was at Amazon for about six and a half years, and now I've been at Google for that long. One thing that struck me immediately about the two companies -- an impression that has been reinforced almost daily -- is that Amazon does everything wrong, and Google does everything right. Sure, it's a sweeping generalization, but a surprisingly accurate one. It's pretty crazy. There are probably a hundred or even two hundred different ways you can compare the two companies, and Google is superior in all but three of them, if I recall correctly. I actually did a spreadsheet at one point but Legal wouldn't let me show it to anyone, even though recruiting loved it.

I mean, just to give you a very brief taste: Amazon's recruiting process is fundamentally flawed by having teams hire for themselves, so their hiring bar is incredibly inconsistent across teams, despite various efforts they've made to level it out. And their operations are a mess; they don't real

Install Python

$ brew install readline sqlite gdbm
$ brew install python --universal --framework
$ python --version
Python 2.7

Symlinks...

	import java.io.*;
	import java.util.*;
	import sun.jvm.hotspot.memory.*;
	import sun.jvm.hotspot.oops.*;
	import sun.jvm.hotspot.debugger.*;
	import sun.jvm.hotspot.runtime.*;
	import sun.jvm.hotspot.tools.*;
	import sun.jvm.hotspot.utilities.*;

	public class DirectMemorySize extends Tool {