Donald Sebastian Leung

AWS | Alibaba Cloud | GitLab | Kubernetes

Subscribe:

About

I am currently a Cloud Technical Specialist at Enfinity Solutions Limited, with my current role focused on:

Architecting and delivering cloud-native solutions to our customers on AWS and Alibaba Cloud, and
Daily operations and maintenance of our on-premises GitLab and Kubernetes infrastructure

In my spare time, apart from upskilling, writing technical articles and participating in tech-related communities, you can also find me listening to podcasts analyzing current global events and occasionally lurking on various social media for entertainment. Every once in a while, I also solve simple Python and Rust challenges on Codewars by hand just for fun, stuff that ChatGPT and friends can typically generate a complete solution for in just under a few seconds (-:

Blog

2025-03-04: Understanding the security benefits of eBPF-based vs. traditional service meshes
2025-01-19: Operating Kafka at scale with Strimzi
2024-12-28: Enforcing recommended practices on Kubernetes with ValidatingAdmissionPolicy
2024-06-09: Protecting stateful workloads on Kubernetes with Kanister
2024-02-25: Deploying Keycloak on Fedora Workstation with Podman
2024-02-13: Running workloads at the edge with MicroK8s
2024-01-14: Exploring OpenShift with CRC
2023-12-26: Running stateful workloads on Kubernetes with Rook Ceph
2023-11-14: Investigating a failed VolumeSnapshot with NFS on Kubernetes
2023-09-16: Configuring an IPsec VPN connection with OpenIKED
2023-09-12: Configuring a simple router with OpenBSD
2023-08-25: Evaluating and securing your Kubernetes infrastructure with kube-bench
2023-08-19: Scanning and remediating vulnerabilities with Grype
2023-08-02: Implementing continuous delivery pipelines with GitHub Actions
2023-07-29: Enabling local project collaboration with Gitea
2023-07-20: Securing your Kubernetes workloads with Sigstore
2023-07-15: Patching a directory traversal attack vulnerability
2023-07-15: Migrating my personal website to an event-driven serverless architecture

GitHub

You can learn a lot more about me on GitHub: DonaldKellett

In case you’re wondering why my GitHub profile name is “DonaldKellett” instead of my usual online identity “donaldsebleung”: I used to own multiple GitHub accounts with at least one for school (Kellett is the name of the high school I attended for my IGCSEs and International A-Levels) and one for personal use - a violation of GitHub’s terms of service I (now) know - before eventually settling on a single GitHub account for everything. Obviously, the “school” account won (-: I’ve since hosted all of my important projects and digital assets on that GitHub account such that changing my GitHub username at this stage would break a ton of things I care about, so I’m basically forced to retain my legacy GitHub username for historical reasons (-: