DevOps - CI/CD Pipeline with GitHub Actions
Intro GitHub Actions is a versatile CI/CD platform that allows developers to automate workflows directly in their repositories. This guide provides an in-depth walkthrough of creating advanced CI/...
Harry Vasanth
Networking - Tailscale: Advanced Subnet Routing and Site-to-Site Integration
The Hybrid Cloud Connectivity Challenge We have discussed the basics of Tailscale and Zero Trust, but a experienced administrator often faces a more complex challenge: Legacy Connectivity. You hav...
Proxmox - Configure GPU Passthrough for VMs
Intro GPU passthrough allows virtual machines (VMs) to directly access a physical GPU, significantly enhancing performance for tasks such as gaming, AI workloads, video editing, or hardware-accele...
Linux - Storage: Optimising NVMe Performance with io_uring and IRQ Affinity
The NVMe Bottleneck: The Kernel Itself Modern NVMe drives are capable of millions of IOPS (I/O Operations Per Second) and sub-100 microsecond latency. However, many Linux servers fail to achieve e...
Proxmox - HA: Mastering Cluster Quorum with QDevice and External Arbiters
The Two-Node Cluster Trap A fundamental rule of Proxmox High Availability (HA) is the Principle of Quorum. To make decisions (like fencing a failed node or migrating a VM), the cluster must have a...
DevOps - Testing: Infrastructure-as-Code Verification with Terratest and Go
The ‘Happy Path’ Delusion in Terraform In Infrastructure as Code (IaC), a successful terraform apply does not mean your infrastructure is actually working. It only means that the cloud provider’s ...
Linux - Recovery: Implementing Timeshift for Bulletproof System Restores
The ‘Update Anxiety’ in Linux Administration Every administrator has experienced the “broken update.” You run apt upgrade, the kernel or a critical library updates, and suddenly the system fails t...
Networking - Monitoring: Deep Packet Inspection and Flow Analysis with ntopng and ClickHouse
Beyond the ‘NetFlow’ Aggregate Standard network monitoring (like SNMP or basic NetFlow) tells you how much traffic is flowing, but it rarely tells you what that traffic actually is. You might see ...
Docker - DevOps: Building Multi-Architecture Images with Buildx and QEMU
The Rise of the ARM64 Datacenter For decades, the x86_64 architecture was the undisputed king of the server room. However, the landscape has shifted. From AWS Graviton instances to Apple Silicon M...
Proxmox - Networking: Deep Dive into EVPN-VXLAN Control Planes and Multi-Tenant Isolation
The Evolution of the Virtual Network Fabric In modern datacenter architecture, we are moving away from simple VLANs and even simple VXLAN overlays. The challenge with a standard VXLAN setup is the...