Backup Discourse with External PostgreSQL Server

Posted on: Sun, 01/21/2018 - 05:58 By: Huahai

Discourse is a modern forum software that is quite popular in the technology circle. One can install a Discourse server easily with the recommended method of using docker. All the services needed by the Discourse server, e.g. Postgresql and Redis, will be running inside a docker container, which is fine for a small installation. However, if one has already an external Postgresql server running, e.g.

FreeIPA in AWS EC2

Posted on: Thu, 12/07/2017 - 23:34 By: Huahai

Show how to install and configure freeIPA server and clients in AWS EC2 using Route53. Point out several important issues.

Ecobee3 installation with K wire

Posted on: Fri, 12/01/2017 - 06:13 By: Huahai

How to install Ecobee3 smart thermostat when one of the existing wire connection is labeled K on the old device? This is problematic because K wire does not appear in the Ecobee3's documentation, nor in the on screen menu. I found a solution: simply connect the K wire to Y1, then enable the G connection on Ecobee3 configuration screen.​

Tips for Traveling with a Baby in Japan - Diaper Bag for Air Travel

Posted on: Wed, 01/11/2017 - 01:09 By: yunyao

The list of items contained in our diaper bag for air travel, annotated with how essential each item was based on our experience as follows:

*** Must have

**   Nice to have

*     Not needed

For travel gear that may not fit in your diaper bag, please visit this page.

  • Portable changing pad (***)

This is definitely essential for both in the airports as well as on the airplane. We like our JJ Cole Collections Changing Clutch.

Tips for Traveling with a Baby in Japan - Travel Gears

Posted on: Mon, 01/09/2017 - 06:50 By: yunyao

We traveled with Boyan, our 13-month son last month to Japan (for those who are wondering, yep, he is the main reason why this blog has been so quiet in the past couple of years. :-)) and spent a unforgettable 10 days there. Before I went there, I searched over the web for tips, but they seemed to scattered around. I therefore decided to share our experience and hope it will be useful for others.

To make the information most useful, I will just list items we brought with us for the trip and comment on how essential each item was based on our experience denoted in the following way:

*** Must have

**   Nice to have

*     Not needed

1. Travel Gears

Data-Oriented Programming (DOP)

Posted on: Sat, 12/03/2016 - 23:33 By: Huahai

JSON is arguably the world's most popular human readable data format today.  It has largely replaced XML as the data exchange format on the Internet. One of the key reasons for the proliferation of JSON is its simplicity.  The data structure are very limited: only arrays, enclosed with []; and objects, enclosed with {}. That's it. It cannot be simpler.

Apparently, this dead simple data format is enough to represent the vast landscape of data that JSON becomes the de-facto data format for Web services. Most Web APIs we use today speaks JSON. However, JSON is not native for most programming languages. It becomes a pain to convert to and back from JSON in programming languages.

Subscribe to