SeongHo's Project 831jsh

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.

mac 에서 docker-desktop을 대체하기

https://gist.github.com/leoh0/3b3c908f0e931d7c620d273c77ea3757

docker-desktop 를 2022년 1월 31일까지 대체해야 하기에 다들 여러 방법을 사용하실 것 같은데 windows에서는 사실 wsl2 를 사용하면서 docker 를 그대로 깔아서 쓸 수 있다는 것 때문에 큰 제약없이(eg. wsl이 결국 브릿지를 거치기 때문에 vpn등 사용시 mtu 조절이 필요할 수 있는 제약이 있음)사용 가능한데 맥은 사실 linux 스택을 그대로 사용할 수 없기때문에 vm을 올려야 하는 상태입니다.

불편한 점

하지만 이에 따라 여러가지 불편한 점들이 있습니다.

OpenShift v4.x - Self Upstream DNS 서버구성

OpenShift에서 제공하는 CoreDNS Operator의 기능적 한계에 대한 자체 구현이 주 목적이며,
CoreDNS Container 이미지를 통해 외부 질의에 대한 것들을 제어 하도록 한다.

이 글을 통해 Production 레벨에서 적용 후 문제가 발생하는 부분에 대해서는 책임을 지지 않는다.

테스트 환경

Bastion VM (NAT)
RHEL 8.x
Podman / SKOPEO / CRI-O

Proxmox PVE Host Config Backup Script

This script can be used to backup essential configuration files from the Proxmox Virtual Enivronment (PVE) host.

The script will create backups using tar with specified backup prefix and date and time stamp in the file name. Script will also delete backups that are older then number of days specified.

Create backup script file

To create backup script that will be executed every day we can create backup script in /etc/cron.daily/ folder. We need to make it writeable by root (creator) only, but readable and executable by everyone:

touch /etc/cron.daily/pvehost-backup

Papers (and articles) for the Container Technologies

For own self-education purpose

Containers

TBD
Docker: Lightweight Linux Containers for Consistent Development and Deployment, Dirk Merkel, Linux Journal, March 2014
Networking in Containers and Container Clusters, Victor Marmol, Rohit Jnagal, and Tim Hockin, netdev 0.1, Feb 14-17, 2015

AWS 학습 링크집 시리즈

AWS 트레이닝 및 자격증 소개 http://bit.ly/aws-tnc-intro
AWS 학습 자료집 http://bit.ly/aws-study-resource
AWS 공인 솔루션스 아키텍트 - 어소시에이트 수험 가이드 http://bit.ly/sacertguide
AWS 공인 개발자 - 어소시에이트 수험 가이드 http://bit.ly/devcertguide
AWS 보안 관련 컨텐츠 모음집 http://bit.ly/secontents
AWS 기반 빅데이터 학습자료집 http://bit.ly/bdonaws
AWS 딥러닝 학습 자료 모음집 http://bit.ly/dlonaws
AWS The Machine Learning pipeline on AWS 교육 학습 자료집 http://bit.ly/ml-pipeline

	## copy from https://gist.github.com/cdekkerpossibilit/d023602c29fdf039c7eabadf64f708e9
	function Confirm-Choice {
	param (
	[string]$Message
	)
	$yes = new-Object System.Management.Automation.Host.ChoiceDescription "&Yes","Yes";
	$no = new-Object System.Management.Automation.Host.ChoiceDescription "&No","No";
	$choices = [System.Management.Automation.Host.ChoiceDescription[]]($yes, $no);
	$answer = $host.ui.PromptForChoice("", $message, $choices, 1)

	# Put this function to your .bashrc file.
	# Usage: mv oldfilename
	# If you call mv without the second parameter it will prompt you to edit the filename on command line.
	# Original mv is called when it's called with more than one argument.
	# It's useful when you want to change just a few letters in a long name.
	#
	# Also see:
	# - imv from renameutils
	# - Ctrl-W Ctrl-Y Ctrl-Y (cut last word, paste, paste)

	## Find Available Target Editions
	DISM.exe /Online /Get-TargetEditions

	## Convert Server Standard 2019 Evaluation to Server Standard 2019
	DISM /online /Set-Edition:ServerStandard /ProductKey:N69G4-B89J2-4G8F4-WWYCC-J464C /AcceptEula

	## How To Activate
	slmgr /ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
	slmgr /skms [server]:[port]
	slmgr /ato

	#!/bin/bash

	# This script intend to mimic TimeMachine exclude list.
	# As the exclude list can evolve between backups it has to be rebuilt before every backup
	# Apple uses 5 types of excludes, four from the /System/Library/CoreServices/backupd.bundle/Contents/Resources/StdExclusions.plist file
	# and files from applications where metadata says to not backup, these can be found usinf
	# sudo mdfind "com_apple_backup_excludeItem = 'com.apple.backupd'"

	SYSLOG=/usr/bin/syslog;
	TEMPFILE=$1;