Qualityology

Open PDF/A PDF file without read-only mode

On October 19, 2017By Evan X. In Tech

The file you have opened complies with the pdf/a standard and has been opened read-only. If you open a PDF/A standard PDF, in default you will not able to modify it because Adobe PDF reader or Acrobat will open it …

Ricoh SP C250DN C252DN PPD CUPS driver for LINUX and macOS

On October 4, 2017By Evan X. In Tech

C250DN or C252DN can be driven by setting PCL6 and use CUPS+Gutenprint driver. However, if we use Generic driver, it will not print out color. Ricoh does not have dedicate PPD driver for Linux platforms like Ubuntu or Debian for …

Edit Hosts file to override DNS record for domains

On October 1, 2017By Evan X. In Tech

Hosts file will instruct your machine to go directly to an IP address for specified domain instead of checking with DNS server. For example, point www.qualityology.com and qualityology.com to Google Cloud Platform server: 35.185.219.11 www.qualityology.com 35.185.219.11 qualityology.com Windows For Windows …

Build an extremely fast WordPress with GCP Part 2: Nginx

On September 30, 2017By Evan X. In Tech

Apache or Nginx, what softwares should be used to for your server to achieve the maximum performance? If you have a small free server from GCP from part 1, and you want it to be able to handle average 1000 …

iPhone's battery draining? Here's what you can do

On September 25, 2017By Evan X. In Tech

If you just upgraded your iPhone to a new version iOS system from the old version for example from iOS 10 to iOS 11 or iOS 9 to iOS 11, you may notice that your battery is draining twice as …

Build an extremely fast WordPress with GCP Part 1: server

On September 17, 2017By Evan X. In Tech

Can you get a super fast server free from Google? Yes, you can. Google Cloud Platform has free tier for US region server. If you are building a small WordPress website using light bandwidth, the free tier is more than …

Install LAMP (Linux Apache MySQL and PHP) phpMyAdmin on CentOS 6 7

On September 8, 2017By Evan X. In Tech

LAMP represents a full featured stack of the most popular web server, database, web programming language known as Apache, MySQL and PHP. This article will cover the steps on how to install the LAMP on a CentOS 6 and CentOS …

FREE Let's Encrypt SSL certificate via Certbot and auto renew

On January 28, 2017By Evan X. In Tech

SSL certificate from Let's Encrypt is free. That is the the whole point of why people are getting Let's Encrypt's SSL certificate. Their SSl are supported in all modern browsers. The only con is the certificate expire in 3 months. …

macOS Sierra Asus Z87-A Clover Installation for Upgrade from El Capitan Or Fresh Install

On October 13, 2016By Evan X. In Tech

Instruction for how to prepare Clover USB system installation flash driver can be found from here: Install Mac OS X with clover EFI bootloader on ASUS Z87a Hardwares used in this instruction: Motherboard: Asus Z87-A motherboard (Get ASUS Z87-A motherboard …

Install entware on ARM MIPS based DDWRT, Tomato, and ASUS Merlin

On September 8, 2016By Evan X. In Tech

Entware is described as a modern optware replacement. Most of entware's packages are taken from OpenWRT, but others are unique. If you are considering to install optware, you should try entware. This instruction is for ARM or MIPS devices only. …