Archive of stories published by ESTL Lab Notes

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LH Fong in ESTL Lab Notes

Mar 8, 2018

Configuring HTTPS to a Web Service on Google Kubernetes Engine

8 responses

LH Fong in ESTL Lab Notes

Mar 5, 2018

Deploying Redis with Persistence on Google Kubernetes Engine

11 responses

Benny Ou in ESTL Lab Notes

Jun 12, 2017

CPU Usage vs Load

Don’t confuse the two!

Eugene in ESTL Lab Notes

Dec 28, 2016

Host Your Own YUM and APT Repository

Keeping servers patched and hardened is critical work. The Internet is awash with malicious…

6 responses

LH Fong in ESTL Lab Notes

Mar 14, 2018

Accessing Docker from a Kubernetes Pod

Coursemology uses Docker to evaluate programming assignments from students. A container is created from a custom image we create for code evaluation, then the student’s code is copied inside and run. The code uses the docker-api gem to control Docker. By…

1 response

Toh Weiqing in ESTL Lab Notes

Nov 30, 2016

A gentler force push on git: Force-with-lease

I currently work at Experimental Systems and Technology Lab where we build web applications. For development, we use git for version control — for the record, git is fantastic in enabling collaborative work. In our team, we use feature branches in…

2 responses

LH Fong in ESTL Lab Notes

Mar 22, 2018

Replication and Failover in PostgreSQL

Coursemology runs its database on a DigitalOcean droplet. A couple of days ago, the underlying hypervisor had some technical issues, bringing this critical droplet down for nearly an hour. In the DigitalOcean console, it was shown as powering on, but remained in…

1 response

LH Fong in ESTL Lab Notes

Jul 11, 2019

Dual Boot Ubuntu on Dell XPS

Having received a Dell XPS 13 laptop with Windows installed, I proceeded…

2 responses

LH Fong in ESTL Lab Notes

Mar 12, 2018

Multi-Writer File Storage on GKE

Coursemology needs a shared file system to allow file downloads. Instructors can click a button to…

1 response

LH Fong in ESTL Lab Notes

Sep 20, 2018

Counting Requests to Nginx

I was recently asked about the amount of traffic Coursemology receives. We don’t monitor this figure live, but I figured it should be possible to figure it out from the Nginx access logs.

Access Log Format

These were the top 10 stories published by ESTL Lab Notes; you can also dive into yearly archives: 2016, 2017, 2018, 2019, 2021, 2022, and 2023.

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ESTL Lab Notes

How can tech improve public education? Here, we take you behind the scenes of our product development efforts in MOE, sharing our learnings in engineering, design, research, and more. If you’re curious about innovation within education, let’s begin our conversation here!

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