Yeongpil Y. ziwon

Getting started with Linux kernel development

Prerequisites

The Linux kernel is written in C, so you should have at least a basic understanding of C before diving into kernel work. You don't need expert level C knowledge, since you can always pick some things up underway, but it certainly helps to know the language and to have written some userspace C programs already.

It will also help to be a Linux user. If you have never used Linux before, it's probably a good idea to download a distro and get comfortable with it before you start doing kernel work.

Lastly, knowing git is not actually required, but can really help you (since you can dig through changelogs and search for information you'll need). At a minimum you should probably be able to clone the git repository to a local directory.

google cloud shell을 이용해서 proxy 서버로 사용해서 공짜로 vpn처럼 이용하기

google cloud shell은 public ip가 없는 private ip만 있는 container입니다. 즉 외부 접근은 google client들을 통해서만 접근이 가능한데 이런 자원들을 가지고 외부에 접근 하는 proxy만드는 법에 대한 소개입니다.

MYNOTEBOOK 이 내가 접속하고 있는 chrome을 띄울 pc라고 보시면 됩니다. 물론 보통은 포트포워딩 해서 접속 할 수 있게 열어야 한다고 보시면 됩니다.

docker run -ti \

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 private Ethereum network with Docker

Ethereum is a decentralized platform that runs smart contracts: applications that run exactly as programmed without any possibility of downtime, censorship, fraud or third party interference.

This is a step-by-step guide, how to setup private Ethereum network.

We’ll set up a network and create two simple JSON-RPC clients in order to communicate with our Ethereum nodes.

	sudo yum install graphviz -y
	sudo pip install aws-visualizer
	profilename=worldskills
	profileregion=us-east-1

	rm -rf target/$profilename
	mkdir -p target/$profilename/default
	mkdir -p target/$profilename/securitygroups
	mkdir -p target/$profilename/subnets

	#!/bin/sh

	if [ "$EUID" -ne 0 ]; then
	echo -e "\nPlease run as root\neg. sudo $0 \n"
	exit
	fi

	GITHUB_USERNAME="ebal"

	cd `mktemp -d`

	Producer

	Setup
	bin/kafka-topics.sh --zookeeper esv4-hcl197.grid.linkedin.com:2181 --create --topic test-rep-one --partitions 6 --replication-factor 1
	bin/kafka-topics.sh --zookeeper esv4-hcl197.grid.linkedin.com:2181 --create --topic test --partitions 6 --replication-factor 3

	Single thread, no replication

	bin/kafka-run-class.sh org.apache.kafka.clients.tools.ProducerPerformance test7 50000000 100 -1 acks=1 bootstrap.servers=esv4-hcl198.grid.linkedin.com:9092 buffer.memory=67108864 batch.size=8196

	# GIT aliases for ~/.gitconfig file
	# @author Grzegorz Korba <[email protected]>
	# Credits: Miscellaneous places on the Internet...

	# GitFlow related sections
	[gitflow "branch"]
	master = master
	develop = develop
	[gitflow "prefix"]
	feature = feature/

	#! /usr/bin/env python3.5
	"""

	Fixing bluetooth stereo headphone/headset problem in ubuntu 16.04 and also debian jessie, with bluez5.

	Workaround for bug: https://bugs.launchpad.net/ubuntu/+source/indicator-sound/+bug/1577197
	Run it with python3.5 or higher after pairing/connecting the bluetooth stereo headphone.

	This will be only fixes the bluez5 problem mentioned above .


	FILE SPACING:

	# double space a file
	sed G

	# double space a file which already has blank lines in it. Output file
	# should contain no more than one blank line between lines of text.
	sed '/^$/d;G'