Byungwoo Jeon byung-u

Using Python to check if remote port is open and accessible.

Taken from http://snipplr.com/view/19639/test-if-an-ipport-is-open/

Usage:

Open a Python prompt
Run the script in is_port_open.py
Call isOpen with a host and a port parameter. Example: isOpen("www.google.com", 80)

Here is a high level overview for what you need to do to get most of an Android environment setup and maintained.

Prerequisites (for Homebrew at a minimum, lots of other tools need these too):

XCode is installed (via the App Store)
XCode command line tools are installed (xcode-select --install will prompt up a dialog)
Java

Install Homebrew:

ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"

Docker 치트 시트

한국어 번역(초벌): nacyot
같이 읽으면 좋은 문서들

왜 Docker를 사용해야하는가?

Moved to git repository: https://github.com/denji/nginx-tuning

NGINX Tuning For Best Performance

For this configuration you can use web server you like, i decided, because i work mostly with it to use nginx.

Generally, properly configured nginx can handle up to 400K to 500K requests per second (clustered), most what i saw is 50K to 80K (non-clustered) requests per second and 30% CPU load, course, this was 2 x Intel Xeon with HyperThreading enabled, but it can work without problem on slower machines.

You must understand that this config is used in testing environment and not in production so you will need to find a way to implement most of those features best possible for your servers.

Setup a Local Only SMTP Email Server (Linux, Unix, Mac)

1 - Point localhost.com to your machine

Most of programs will not accept an email using just @localhost as domain. So, edit /etc/hosts file to make the domain localhost.com point to your machine, including this content to the file:

127.0.0.1 localhost.com

	# Kernel sysctl configuration file for Red Hat Linux
	#
	# For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and
	# sysctl.conf(5) for more details.

	# Turn on execshield
	# 0 completely disables ExecShield and Address Space Layout Randomization
	# 1 enables them ONLY if the application bits for these protections are set to “enable”
	# 2 enables them by default, except if the application bits are set to “disable”
	# 3 enables them always, whatever the application bits

	input {
	redis {
	host => "127.0.0.1"
	data_type => "list"
	key => "logstash"
	}
	}
	input {
	udp {
	type => "syslog"

	library(RCurl)
	# Set SSL certs globally
	options(RCurlOptions = list(cainfo = system.file("CurlSSL", "cacert.pem", package = "RCurl")))

	library(twitteR)
	reqURL <- "https://api.twitter.com/oauth/request_token"
	accessURL <- "https://api.twitter.com/oauth/access_token"
	authURL <- "https://api.twitter.com/oauth/authorize"
	apiKey <- "xxxxxxxxxxxxxxxxxxxxxx"
	apiSecret <- "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

	# Thanks to this post:
	# http://blog.ikato.com/post/15675823000/how-to-install-consolas-font-on-mac-os-x

	$ brew install cabextract
	$ cd ~/Downloads
	$ mkdir consolas
	$ cd consolas
	$ curl -O http://download.microsoft.com/download/f/5/a/f5a3df76-d856-4a61-a6bd-722f52a5be26/PowerPointViewer.exe
	$ cabextract PowerPointViewer.exe
	$ cabextract ppviewer.cab

	def fermat(n):
	if n == 2:
	return True
	if not n & 1:
	return False
	return pow(2, n-1, n) == 1

	# benchmark of 10000 iterations of fermat(100**10-1); Which is not prime.

	# 10000 calls, 21141 per second.