DNS for Engineers
How TTLs really affect changes, why propagation feels slow, where DNS failover helps and where it doesn’t, plus cutover playbooks that keep rollback easy.
devdnsnetworking
Posts tagged “ops”
Tiny explainers grouped by topic. Spend less time Googling, more time building.
Secrets Management That Survives Production
Env vars are only the beginning. This covers secret managers, rotation, least privilege, and delivery patterns that do not leak credentials across your stack.
devsecuritysecrets
Connection Pooling for Databases — sizing, timeouts, and “too many clients” fixes
A production-focused guide to right-sizing pools, setting timeouts that prevent stalls, and fixing Postgres/MySQL “too many clients/connections” errors with app and proxy patterns.
devdatabasespostgres
Kubernetes, Minimal Survival Guide — ship, debug, and sleep at night
The 80% you actually need: Pods, Deployments, Services, Ingress/Gateway, Requests/Limits, Probes, Config & Secrets, HPA, storage, and the kubectl commands you’ll use daily.
devopskubernetes
Demystifying DNS Propagation — why changes aren’t instant
DNS changes feel slow because of caching everywhere: resolvers, browsers, OSes, CDNs, and parent zones. Here’s the mental model, typical timelines, and how to plan zero‑drama cutovers.
devdnsnetworking
Containers 101 — what they are and why they matter
A no-jargon primer on containers: how they isolate processes, how images/layers work, and what Docker/Kubernetes actually do.
devopscontainers
SSH Keys, Minus the Mystery
Generate a key, load it into `ssh-agent`, add it to a server, and clean up your SSH config without the usual trial and error.
devsecurityssh
Cron expressions, decoded in 60 seconds
A quick mental model to read and write cron schedules without Googling.
devcronops