A decade after Doom’s release, in 2003, journalist David Kushner published a book about id Software called Masters of Doom, which has since become the canonical account of Doom’s creation. Carmack, realizing the problem with his renderer was fundamental enough that he would need to find a better rendering algorithm, started reading research papers. He eventually implemented a technique called “binary space partitioning,” never before used in a video game, that dramatically sped up the Doom engine.

Hubspot migrated hundreds of ZooKeeper instances from individual server instances to Kubernetes without downtime. Their approach used powerful Kubernetes features like endpoints to ease the process, so we’re sharing the high level outline of the approach for anyone who wants to follow in our footsteps.

Slack’s TURN server allowed relaying of TCP connections and UDP packets to internal Slack network and meta-data services on AWS. Accessing to that meta-data services usually allow you to get the IAM credential of that instance profile.

Having a good database schema design is crucial for building applications that will need to scale in traffic and complexity. If you happen to do a bad design choice you will see that it takes a lot of effort to stop the pattern from propagating to your backends’ services and controllers, and finally to your frontend

Postgres is great and it has so many options to tune its performance. New article pop up time to time. There are four high-level settings which will be discussed here: shared_buffers, wal_buffers, effective_cache_size, and maintenance_work_mem.

Expensify has an unusual technology stack in many way. No internal dns, just managed /etc/host, but most surprising is that they don’t use MySQL or Postgres — instead using none other than SQLite — and it works great. They wrap SQLite in bedrockdb, even using it for their job queue.

Diagnosing network problems is something that system administrators dread. Almost always their inability to perform efficient network analysis is based on their own reluctance to learn and embrace network testing. Let’s change that by learning three tools that a system admin should routinely use: mtr, iperf, and MTU testing with ping.

Third book in the SRE seria book by Google. It’s free in all digital form now: PDF, EPUB(iBook), Mobi(Kindle)

A Buffer Overflow is a bug class in a program typically written in a memory unsafe language like C or C++. Buffer Overflow bugs from user-input can often allow someone to overwrite some data in memory they weren’t supposed to. Before we dive into how to exploit Buffer Overflow bugs, we will do a quick introduction to Assembly.

We all run our own web server, dev server, hosting side project, but prolly not many run their own mail server. It is suprising easy to do that in 2020. Plus you got to lear what component we need for mail server.

TLS is fundamental to secure HTTP trafic. They are complex, from time to time we include link about TLS to help you understand more about it. This is chapter 4 of a networking 101 book, help you lean Encryption, Authentication, and Integrity, TLS Handshake. RSA, Diffie-Hellman and Forward Secrecy and more. Another article, in very short from about TLS Handshake by Cloudflare if you just want a short overview.