Posts on khz

A self-tuning kubernetes homelab

Sun, 22 Feb 2026 00:00:00 +0800

Every now and then, I wake up to a pull request. It looks something like this:

The diff is a handful of Kubernetes resource request and limit changes across a couple of HelmRelease manifests. The PR description explains why each change was made: which containers need more memory, which ones are overprovisioned, how the proposed state fits on each node. I review it, click merge, and Flux rolls it out. That’s it.

Reflection

Fri, 20 Apr 2018 00:00:00 +0800

Learning

Reading

After all, the only way to overcome pain is to first learn how to bear.

Self-referencing Keys in JavaScript Object Declarations

Tue, 21 Mar 2017 00:00:00 +0800

Often times while programming in JavaScript, which I have been doing a lot lately, I find myself wanting to refer to a key that I have just declared when I am initializing an object.

const myNewObj = {
 a: 'xxx',
 b: 'yyy',
 c: a + this.b, // doesn't work
};

console.log(myNewObj.c); // undefined

Here, neither a or this.b would work since there is no a yet while c is being defined and this does not refer to myNewObj. Obviously, you could define xxx and yyy in separate variables first and refer to them later in the object initialization. Or you could initialize the object without c key and later define c as myNewObj.c = myNewObj.a + myNewObj.b;. But a neater way that I found out is to utilize getters.

Finding A Knight's Tour

Fri, 12 Feb 2016 00:00:00 +0800

A Knight’s Tour is a sequence of moves done by a knight on a chessboard such that it visits each and every square exactly once. Subsequently, the objective of the Knight’s Tour problem is to determine whether there exists a Knight’s Tour from a given starting position. In graph theory terms, it is a form of Hamiltonian path where you visit each vertex of the graph exactly once along the path. Tours can also be cyclic or closed if the final square is a knight’s move away from the first and acyclic or open otherwise.

A Look-back at 2015

Thu, 31 Dec 2015 00:00:00 +0800

Hand with Reflecting Globe by M. C. Escher

As the year comes to a close, I would like to take a moment to reflect on 2015. Looking back, it will mostly be remembered as the year I dealt with depression and self-esteem issues. Other than the endeavour to conquer my inner demons, I made a couple of new friends and acquaintances, lost some, burnt some bridges, built new ones, discovered new pastimes and grew out of some old ones. In the grand scheme of things, it wasn’t a very fruitful year as I wished it would be.