Development Logs

By: Calvin Chieng

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Security SSL Nginx DH Param Letsencrypt Crawler Blacklist AWS S3 Ruby SDK Android Icons Design Gradle Unicode Obfuscation Rails API Signature P12 Convert PEM Cert OpenSSL Encryption Public Key NodeJs NPM PM2 Setup Bootstrap 3 Print reCaptcha Optimization Hint Performance Database Migration Delayed Job HTTP2 iOS AFNetworking TLS Deployment Email SEO Facebook Meta Open graph Sitemap DNS Logging Passenger Config CloudFront Sendy Microdata Maintenance Ubuntu RabbitMQ Sidekiq Cookies HSTS Cron job Crontab SMTP RSpec Mailer Test Exception Bugsnag Bundle Gem Java Framework Spark PHP7 Laravel Httparty Retrofit ActionMailer Telegram Chatbot Controller Jar Upstart Systemd Rubocop Coding standard Git Gitignore Secret Capistrano Version Date Time Google Oauth2 Omniauth Cache Redis Upgrade Javascript Yarn Authentication rbenv Active Storage JSON Form YAML Jackson Pannellum Panorama Image 360 Linux Storage

Check signature of Android APK

Guide Android Security SDK

Posted by Calvin Chieng on July 10, 2019, 14:38

Setting up Nginx and Passenger on Ubuntu 18.04

2019 Updated

Guide Ubuntu Passenger Nginx Setup

Posted by Calvin Chieng on July 4, 2019, 19:24

Setting up ruby on rails on Ubuntu 18.04

2019 updated

Guide Ruby Rails Setup Ubuntu

Posted by Calvin Chieng on July 4, 2019, 19:19

Reconstruct RSA public key from exponent and modulus

Via ASN1 definition and OpenSSL

Guide OpenSSL Public Key

Posted by Calvin Chieng on June 27, 2019, 16:36

Remove html extension and map URL to static html file in Nginx

Useful for serving static website

Guide Nginx Config

Posted by Calvin Chieng on June 27, 2019, 16:17

Add or remove domain to existing Letsencrypt's cert

For installation via certbot

Snippet Nginx Config SSL Letsencrypt

Posted by Calvin Chieng on June 27, 2019, 16:03

Adding CORS header for specific domains in Nginx

Snippet Nginx Config Security

Posted by Calvin Chieng on June 27, 2019, 15:58

Clean-up inodes 100% usage caused by linux headers

In ubuntu 16.04

Error Ubuntu Linux Storage

Posted by Calvin Chieng on September 7, 2018, 18:16

Convert equirectangular panorama image into pannellum supported multi-resolution image

To support higher resolution 360 images on mobile device

Snippet Pannellum Panorama Image 360

Posted by Calvin Chieng on July 6, 2018, 17:29

Dynamically supply SMTP config in Rails

For multi-tenants system or user editable SMTP config

Snippet Rails ActionMailer SMTP

Posted by Calvin Chieng on June 30, 2018, 16:53

Read YAML file in Java

Convenience way to set configuration

Snippet Java YAML Jackson

Posted by Calvin Chieng on June 14, 2018, 13:44

Get and set json type data on html form in Rails

Via Activerecord and form helper

Guide Rails JSON Form

Posted by Calvin Chieng on May 31, 2018, 00:35

Changing the passenger max process

Adjust to balance the performance vs. resources

Guide Ruby Passenger Nginx

Posted by Calvin Chieng on May 22, 2018, 19:56

Increase file descriptor for RabbitMQ

For ubuntu 16.04

Snippet Ubuntu RabbitMQ Config

Posted by Calvin Chieng on May 16, 2018, 20:44

Using Active Storage for API project

With AWS S3 as storage service provider

Guide Rails Active Storage S3 AWS

Posted by Calvin Chieng on May 13, 2018, 15:30