New Posts
Life and Investment Through the Lens of Uncertainty
Judge decisions, not outcomes: why holding longer makes a loss less likely, why the past was uncertain too, and why you must avoid getting wiped out.
Navigating Shell for Productivity and Profit
Shell tricks and my setup: brace expansion, process substitution, heredocs, aliases, fzf history search, and zsh with oh-my-zsh and powerlevel10k.
The Good, Bad, and Ugly: Istio for Short-lived Pods
Envoy sidecars keep Istio Job Pods alive and may lag app startup. A webhook-injected wrapper waits for proxy readiness; a controller stops Envoy when done.
DNS, UDP, IP Anycast, and All That
Why DNS prefers UDP: BGP anycast route changes can break TCP connections, and a UDP query takes 2 packets versus 11 for TCP, with no connection state.
Lessons from Scaling GKE: L4 ILB Tops at 250 Nodes
GKE's internal load balancer health-checks only 250 nodes. With externalTrafficPolicy Local, only Nginx nodes pass, so a subset lacking them broke ingress.
Parameters with Defaults in Go: Functional Options
Option structs can't tell zero from unset, pointer fields are clumsy, and variadics cover one parameter. Functional options give Go overridable defaults.
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