We all know what a closure does and how powerful they are! They hold the special power of capturing the variables used within them but defined outside their own body’s scope. (i.e they can close over the scope larger than their own scope, hence the name — closure!). Most of…

This concept has somehow got me intrigued on a few occasions and I am sure majority of the readers find this interesting too. Let’s start with what is a “variance”? …

Rust has a very powerful pattern matching system. You can match literals, structs, enums, slices (of varying lengths), specific fields in a struct (via de-constructing), nested fields, references, ranges, etc. Assuming we have a fair understanding of pattern matching in Rust, let’s explore the ref keyword and the relationship between…

In the world of high level languages like Java, Python, JavaScript, Ruby, Go, the developer mindset is not really tuned to understand one important thing — which is Memory. The reason being — the Garbage Collector as it keeps track of all the objects in the memory for you. But…

Let’s have a look at the following code: trait Animal { fn talk(&self); } struct Cat {} struct Dog {} impl Animal for Cat { fn talk(&self) { println!(“meow”); } } impl Animal for Dog { fn talk(&self) { println!(“bark”); } } fn animal_talk(a: &dyn Animal) { a.talk(); } fn…

When it comes to Kubernetes networking, Calico is widely used. One of the main reasons being its ease of use and the way it shapes up the network fabric. Calico is a pure L3 solution, where packets are routed in just the same manner as your regular Internet. Each node…

Before moving to understanding the mutable reference, let’s have a look at a very basic example in C. int main() { int i = 1; i = 2; } This code compiles just fine. Let’s see its Rust equivalent. fn main() { let i:i32 = 1; i = 2; } …

CNI is being mentioned a lot in conjunction with Kubernetes. It is now become an integral part of Kubernetes, silently doing it’s job of connecting the pods across different nodes and being well adaptive in integrating different kind of network solutions (overlays, pure L3, etc). Having said that, it is…

Having a dynamic public IP can be really annoying when it comes to accessing the services in AWS, guarded by security groups (assuming you are a small shop and don’t have the VPN or AWS DirectConnect infra setup yet or maybe it is your personal AWS account.) Anyway, it’s a…