Chris Lee | Chris' Laboratory

Linux Server

13/12/202013/12/2020

Convert gnome-boxes virtual machine image to Oracle Virtual Box image

First convert gnome-boxes image to Virtual Box image $ cd ~/.local/share/gnome-boxes/images $ qemu-img convert -O vdi win10 win10.vdi $ mv win10.vdi ~/VirtualBox\ VMs/ Open Virtual...

Uncategorized

05/12/202005/12/2020

Clear Kubernetes current context

$ kubectl config unset current-context https://github.com/kubernetes/kubectl/issues/483#issuecomment-503568886

Frameworks PHP

21/11/202028/11/2020

실시간 환율 받아오기 (Get real-time currency information)

Code snippet to retrieve real-time currency from exchangeratesapi.io <?php echo get_currency("AUD", "KRW"); /* * Retrieve real-time currency from exchangeratesapi.io * * @param string $from_currency e.g.)...

Frameworks Node.js

07/11/202010/11/2020

Binance Auto Trading Bot

Github: https://github.com/chrisleekr/binance-trading-bot This is a test project. I am not using for trade. So use with your own risk. By the way, I tested, you...

Server

24/07/202024/07/2020

Gitlab troubleshooting

Environment: Gitlab is running under docker Error with ActiveModel::UnknownAttributeError (unknown attribute 'author_name' for SecurityEvent.): $ docker exec -it gitlab /bin/bash gitlab$ cd /var/opt/gitlab gitlab$ gitlab-rake...

Node.js

16/05/202029/08/2020

Image Optimisation Service

Github: https://github.com/chrisleekr/image-optimisation This is a practice project. The project contains Node.js API that optimise images - jpg, png, svg, and gif. Node.js, Express, Webpack, Imagemin...

Frameworks Tools

10/04/202029/08/2020

애자일 스프린트 회고 도구(Agile Sprint Retrospective Tool)

스프린트(Sprint)를 운영하면 2주에 한번 아니면 한달에 한번씩 정기적인 "회고(Retrospective)"를 해야한다. 모든 팀원이 솔직하게 익명으로 자신의 의견을 개진해야하고, 그 의견들을 다같이 토론하여 프로젝트 운영에 반영해야 팀의...

MongoDB Node.js

13/03/202029/08/2020

Node.js + MongoDB RESTful API Boilerplate

Github: https://github.com/chrisleekr/nodejs-mongodb-api-boilerplate This is a sample project that I followed the tutorial Build Node.js RESTful APIs in 10 Minutes written by Olatunde Garuba. How to start $...

Linux Server

16/12/201928/11/2020

Mount iPhone/iPad in Arch Linux

Install libimobiledevice and ifuse$ yays libimobiledevice ifuse(* important) Pair with iPad - make sure iPad is connected via USB cable$ idevicepair pairRun usbmuxd $ sudo...

Node.js Vue.js

10/10/201929/08/2020

Node.js (REST API) + Vue.js/Nuxt.js (Frontend/Backend) + MySQL Boilerplate

Github: https://github.com/chrisleekr/nodejs-vuejs-mysql-boilerplate This is a boilerplate project. The project contains Node.js REST API and frontend/backend developed by Vue.js with BootstrapVue. APINode.js, Express, Webpack, Express Validator,...

Linux Server

05/09/201929/08/2020

When Arch Linux installation, cannot find nvme0n1 in DELL XPS 13

When you do lsblk, it does not show your SSD, then it means RAID for SATA Operation is on. Simply open Bios -> System Configuration...

Docker Linux Server

17/08/201929/08/2020

Linux Docker uses excessive memory

Issue: I have a 16G memory and configured swap as 16G.When start mysql docker, mysqld uses crazy amount of memory and make the system freeze....

Linux Server

12/07/201929/08/2020

VirtualBox + Windows 7 USB storage not recognised

Environments: Arch LinuxOracle VM VirtualBox 6.0.8 + Extension Pack Issue: In "Device Manager", Universal Serial Bus Controller driver is not installing correctly. USB storage is...

Linux Server

07/07/201929/08/2020

Share clipboard between GNOME and Boxes (Windows)

Reference: https://help.gnome.org/users/gnome-boxes/stable/clipboard.html.enhttps://www.spice-space.org/download.html While express installation typically takes care of making shared clipboard available to you, express installation is not available for all operating systems. In...

Linux Server

29/06/201929/08/2020

Winetricks failed to install WMP9

References: https://www.hahwul.com/2018/08/install-kakaotalk-on-ubuntu-18.04.htmlhttps://www.playonlinux.com/en/topic-16540-MPSetup_wmp9_will_not_run.html Error message: Executing cd /home/username/.cache/winetricks/wmp9 Downloading https://download.microsoft.com/download/1/b/c/1bc0b1a3-c839-4b36-8f3c-19847ba09299/MPSetup.exe to /home/username/.cache/winetricks/wmp9 Executing cd /home/username/.cache ------------------------------------------------------ sha256sum mismatch! Rename /home/username/.cache/winetricks/wmp9/MPSetup.exe and try again. ------------------------------------------------------ Solution: Download...

Frameworks Server

18/05/201918/05/2019

Certbot으로 무료 SSL/TLS 인증서 발급/재발급 하기

참고자료: https://www.bennadel.com/blog/3420-obtaining-a-wildcard-ssl-certificate-from-letsencrypt-using-the-dns-challenge.htm SSL 새로 발급 받기 #!/bin/bash docker run -it --rm --name letsencrypt \ -v "/etc/letsencrypt:/etc/letsencrypt" \ -v "/var/lib/letsencrypt:/var/lib/letsencrypt" \ certbot/certbot:latest \ certonly \ -d...

Frameworks MySQL PHP

29/03/201929/08/2020

[PHP+MySQL] 간단한 카카오 i 오픈빌더 챗봇 만들기 (Kakao i Open Builder)

카카오 i 오픈빌더 (Kakao i Open Builder)를 이용한 플러스 친구 챗봇 (PHP + MySQL) 백엔드 프로젝트 이 프로젝트는 샘플 테스트용으로 카카오톡 플러스 친구 챗봇을 구현하기...

Security Server

03/03/201903/03/2019

When you get 403 Forbidden error in VentraIP shared hosting

Out of nowhere, I started getting the error when I try to post any article. After in-depth investigation, I found if I add any code...

Javascript

02/03/201903/03/2019

Workerbox (Service Worker)로 사이트 로딩 속도 향상 시키기

Service Worker: 웹페이지와 별개로 브라우저가 백그라운드에서 실행시키는 자바스크립트 코드. 푸쉬, 동기화, 오프라인 모드 지원 https://developers.google.com/web/fundamentals/primers/service-workers/ Workerbox: 구글에서 제공하는 자바스크립트 라이브러리로써 웹앱의 오프라인 지원을 쉽게 할...

Angular (ngx) Frameworks

24/11/201802/03/2019

Get all validation errors for Angular form

Reference 1: https://gist.github.com/JohannesHoppe/e8d07d63fc345a5fdfdf4fc4989ef2e4 import { FormGroup, ValidationErrors } from '@angular/forms'; export function getFormValidationErrors(form: FormGroup) { const result = []; Object.keys(form.controls).forEach(key => { const controlErrors: ValidationErrors =...

Frameworks Yii2

11/11/201811/11/2018

Yii2 errors – Failed to clone the git and “extra.asset-installer-paths” option is deprecated`

Error 1. The "extra.asset-installer-paths" option is deprecated, use the "config.fxp-asset.installer-paths" option Update composer.json by removing asset-installer-paths and add fxp-assets { ... "extra": { "yii\\composer\\Installer::postCreateProject": { "setPermission":...

Frameworks Javascript

14/10/201814/10/2018

Javascript project devtools

Javascript project development tools Babel: https://babeljs.io/docs/en/ Javascript compiler - Transform syntax, Polyfill features and so on $ babel -o dist/package.js dist/package.js Standard: https://standardjs.com/ Javascript style guide, linter...

Linux Server

16/09/201829/08/2020

Backup/Restore pacman & yaourt packages list

Arch linux Backup pacman package list pacman -Qqet | grep -v "$(pacman -Qqg base)" | grep -v "$(pacman -Qqm)" > pacman-packages.txt Restore pacman package ...

Angular (ngx) Frameworks

03/09/201803/09/2018

Local workspace file (‘angular.json’) could not be found.

After upgrading Angular application using ncu -a, got an error message Local workspace file ('angular.json') could not be found.</code. $ ncu -a $ npm run...

Linux Server

15/07/201829/08/2020

Error on installing `networkmanager-l2tp 1.2.10-3` in Arch Linux

References: https://gist.github.com/pastleo/aa3a9524664864c505d637b771d079c9 https://askubuntu.com/questions/981165/l2tp-ipsec-failing-to-connect-kubuntu-17-10 When run the command to install the package `networkmanager-l2tp 1.2.10-3`, an error occurs like below: $ yaourt -S networkmanager-l2tp ... ==>...