Bao Nguyen

Bao Nguyen

Bao Nguyen

I write, so I learn.

Push Down Filter for CSV files in Spark 3.0

Spark 3.0 is out, and there are ton of improvements! But there are a nice improvement that is not yet highlighted in the announcement post…

Jun 29 · 2 min read

Understanding Docker Container Memory Limit Behavior

Docker allows you to set the limit of memory, CPU, and also recently GPU on your container. It is not as simple as it sounds.

Bao Nguyen in FAUN

Nov 26, 2019 · 4 min read

Various notes on Software Architecture

This is my collection of notes and opinions on Software Architecture. This helps to guide me through software architecture and design. I…

Jul 10, 2019 · 2 min read

Writing a Chat Server in Go

I have been using Go for a while, but mainly for tools. So I decided to invest some time to learn more about the language, and also more…

Oct 24, 2018 · 7 min read

AWS: A (short) journey of restoring EC2 instances from EBS snapshot

So I had a challenge on the other day to restore an EC2 instance from EBS Snapshots. I have worked with AMI and EBS for many years, but i…

Sep 1, 2018 · 3 min read

How to use AWS SSM Parameter Store easily in Python

AWS just announced a new service AWS Secret Manager in SF Dev Summit (I was there at the announcement 😇), which is a cool service to help…

Apr 7, 2018 · 4 min read

Python: Timezone and Daylight savings

Timezone is a hard problem. DST is even a harder problem. I found myself walking into problems and problems when I started using datetime…

Jan 18, 2018 · 3 min read

AWS: Correct permission to start an EC2 instance with encrypted EBS

AWS has a very flexible permission system using IAM policies. But sometime it is also complicated to get the access control right…

Dec 15, 2017 · 2 min read

AWS: Copying AMI across accounts

Copying AWS AMI across accounts require a lot of manual steps. If you do from UI, you will need to share the images, then share the…

Nov 8, 2017 · 1 min read

A naive approach to GPU resource management

One of the feature that I am dealing with is GPU resource management. The requirement is that we have multiple jobs are scheduled, each job…

Aug 27, 2017 · 2 min read

Goodbye to MySql

There is one thing that has been confusing me for a while: between MySql and Postgres, what I should use. Today I finally have my answer.

May 24, 2017 · 1 min read

Direct reply-to in RabbitMQ

I’m a new guy to RabbitMQ and in a process of converting a system to use message-based architecture. The main motivation to make the system…

May 12, 2017 · 2 min read

First try with Bazel

I have been knowing Bazel for a while, and it has been in my #ToLearn list for a while. Recently I gave it a try and this blog post…

Apr 16, 2017 · 3 min read

Introducing: Kube-door

I would like to introduce Kube-Door, a small side project that I have been working for a little while. Kube-door is a is a simple reserve…

Apr 3, 2017 · 2 min read

Lesson learnt from launching a Kubernetes cluster from scratch

There are many tools for launching a kubernetes cluster, after trying many tools my current favorite one is Kargo. My main reason is Kargo…

Mar 19, 2017 · 4 min read

Exposing Kubernetes cluster over VPN

Another exercise that I worked in last few weeks is to setup and test kubernetes cluster, and one of the thing that bother me is that i can…

Feb 8, 2017 · 4 min read

OpenVPN auth-user-pass-verify example

One of my recent task to enable authentication over OpenVPN. auth-user-pass-verify is one of the way (is it the only way?) to enable…

Feb 2, 2017 · 1 min read

Tensorflow: exporting model for serving

Few days ago, I wrote about how to retrieving signature of an exported model from Tensorflow, today i want to continue with how to export a…

Feb 1, 2017 · 2 min read

Tensorflow: Retrieving serving signatures from an exported model

Simple question, but it took me many hours of digging into the code to figure out. Someone should have added a document or something.

Jan 26, 2017 · 1 min read

CouchDB — my first try

I recently have an interesting task about data ingestion. The use case is we have hundreds GB of CSV files, each file contains 10k — 10m…

Jan 12, 2017 · 3 min read