Networking

A practical guide to installing and configuring the Ingress-Nginx Controller in Kubernetes, covering Helm and kubectl methods, cloud-provider annotations, and local testing workflows.

A practical guide to Kubernetes Network Policies, covering how Ingress and Egress rules work, AND/OR logic in rule layout, and the behavior of policyTypes.

A deep dive into how the Linux kernel receives network packets, covering the full path from NIC hardware through NAPI, softirqs, GRO, RPS, and protocol layers. Includes practical monitoring commands and tuning knobs for each stage.

A practical walkthrough of how Linux allocates and manages RX/TX ring buffers for network interfaces, covering DMA, softirq processing, and tuning knobs like netdev_budget.

Configure a legacy SysV init script to wait for network availability in RHEL 7 by adding the Required-Start LSB directive. This guide shows how systemd honors those headers so third-party initscripts start in the correct order.

A step-by-step guide to creating and securing VLANs in the UniFi Network Console, including firewall rules to block inter-VLAN traffic and restrict console access.