Kerus Ashe kerus1024

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.

Setting Up OSX For Python Developments

This gist has been created using OSX Mavericks, but it sould work with any OSX 64-bits system – Mountain Lion, Mavericks and for sure Yosemite ;) In case that you are using a OSX 32-bits system OSX Lion or Snow Leopard (OSX Leopard is not supported by XCode) just include the 32-bits System? section.

Bash profile setup

64-bits System

OS X Mountain Lion, Mavericks & Yosemite are full 64-bit systems so lets configure them to ensure that incoming user's package installations (e.g., Homebrew package installations) will be on a 64 bits system and taking precedence over OSX packaged binaries.

Some examples of SNAT, DNAT with iptables with comments

mainly used in start-up script

How to test 'safely'

When we play with iptables aka firewall we might end up in situation, where we execute rule, which has unforseen impact - lock yourself out. Recovering from this situation is necessity.

How to:

Enable reboot via SMS.

Test all commands in shell first before putting them into Start-up script. This way the command will be wiped out, when unit is rebooted.

masquarade all outgoing packets to be WLAN0 IP

Squid

Squid is a HTTP(S) caching proxy to reduce bandwidth and improves response times.

data compression proxy

Data compression proxy is a http proxy by google aimming to reduce cellular data usage by gzip and webp (Yes, it will compress jpg, png and gif to webp).

Squid + data compression proxy

The netfilter hooks in the kernel and where they hook in the packet flow

The figure below calls out

The netfilter hooks
The order of table traversal

	var net = require("net");

	process.on("uncaughtException", function(error) {
	console.error(error);
	});

	if (process.argv.length != 5) {
	console.log("usage: %s <localport> <remotehost> <remoteport>", process.argv[1]);
	process.exit();
	}

	LANG=en_US.UTF-8
	LC_CTYPE=en_US.UTF-8
	LC_NUMERIC=en_US.UTF-8
	LC_TIME=en_US.UTF-8
	LC_COLLATE=en_US.UTF-8
	LC_MONETARY=en_US.UTF-8
	LC_MESSAGES=en_US.UTF-8
	LC_PAPER=en_US.UTF-8
	LC_NAME=en_US.UTF-8

	Decoding the data in /proc/net/tcp:

	Linux 5.x /proc/net/tcp
	Linux 6.x /proc/PID/net/tcp

	Given a socket:

	$ ls -l /proc/24784/fd/11
	lrwx------ 1 jkstill dba 64 Dec 4 16:22 /proc/24784/fd/11 -> socket:[15907701]

	git clean -xfd
	git submodule foreach --recursive git clean -xfd
	git reset --hard
	git submodule foreach --recursive git reset --hard
	git submodule update --init --recursive

	package main

	import (
	"net/http"
	"os"
	"bytes"
	"path"
	"path/filepath"
	"mime/multipart"
	"io"