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CDN（内容分发网络）技术原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...网络(CDN)是一种新型的网络构建方式，它是为能在传统的IP网发布宽带丰富媒体而特别优化的网络覆盖层；而从广义的角度，CDN代表了一种基于质量与秩序的网络服务模式。简单地说，内容发布网络(CDN)是一个经策略性部署的整体...
Add Keypair to existing EC2 instance
...gain SSH access to these instances, is it possible to create a new Keypair and apply it to the instances so I can SSH in? Obtaining the exisiting pem file for the keypair the instances were created under is currently not an option.
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Detecting 'stealth' web-crawlers
...h were then updated automatically as needed by checking claimed user-agent strings and, if the client claimed to be a legitimate spider but not on the whitelist, it performed DNS/reverse-DNS lookups to verify that the source IP address corresponds to the claimed owner of the bot. As a failsafe, the...
How does the socket API accept() function work?
The socket API is the de-facto standard for TCP/IP and UDP/IP communications (that is, networking code as we know it). However, one of its core functions, accept() is a bit magical.
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Validating IPv4 addresses with regexp
...aptured either way if we didn't have a full-match in the first place.
Old and shorter version (less readable) (63 chars)
^(?:(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])(\.(?!$)|$)){4}$
Older (readable) version (70 chars)
^(?:(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])(\.(?!$)|$)){4}$
It ...
Increasing the maximum number of TCP/IP connections in Linux
I am programming a server and it seems like my number of connections is being limited since my bandwidth isn't being saturated even when I've set the number of connections to "unlimited".
...
How to create a self-signed certificate with OpenSSL
...me = subject
req_extensions = req_ext
x509_extensions = x509_ext
string_mask = utf8only
# The Subject DN can be formed using X501 or RFC 4514 (see RFC 4519 for a description).
# Its sort of a mashup. For example, RFC 4514 does not provide emailAddress.
[ subject ]
countryName ...
How Drupal works? [closed]
...e. The settings.php file is parsed via include_once(), and any variable or string overrides established there are applied. See the “Variable Overrides” and “String Overrides” sections of the file sites/all/default/default.settings.php for details.
Early Page Cache
In situations requiring a...
Enable remote MySQL connection: ERROR 1045 (28000): Access denied for user
... the IP you want to allow access, USERNAME is the user you use to connect, and PASSWORD is the relevant password.
If you want to allow access from any IP just put % instead of your IP
and then you only have to put
FLUSH PRIVILEGES;
Or restart mysql server and that's it.
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How to find SQL Server running port?
... answered Sep 6 '12 at 10:04
AnandPhadkeAnandPhadke
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