How to Change the DNS Server on Ubuntu
Learn how to override the default DNS server on Ubuntu using systemd-resolved, so you can quickly mitigate DNS resolution failures without waiting on your hosting provider.
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I'm John, a full stack engineer and system administrator with over 25 years of experience building and operating SaaS products. I write articles and tutorials — based on personal experience — about software development and infrastructure.
Recent articles
Cache-busting CSS and Javascript with Python
A practical guide to solving browser cache issues for static assets using a Python-based approach, with code you can drop into your deployment and templates.
How to Configure PgBouncer for PostgreSQL Connection Pooling
PostgreSQL spawns a new process for every client connection, which becomes expensive under load. Learn how to install and configure PgBouncer to pool connections and keep your database performing well at scale.
Migrating PostgreSQL to a New Environment with Logical Replication (Primary/Replica to Primary/Replica)
A practical, phased runbook for migrating PostgreSQL from an old primary/replica pair to a new primary/replica pair using logical replication for the major-version move and streaming replication for steady-state high availability.
Git Branching Strategy for Shared Code Across Multiple Features
When multiple feature branches depend on the same code, your branch strategy can either keep development moving or create merge chaos. This guide covers two practical approaches: daisy-chained branches and sibling branches from a shared base.
Configuring Next.js with Nginx and PM2 for Production Deployment
A comprehensive guide to deploying a Next.js application on a production server using Nginx as a reverse proxy and PM2 for process management and zero-downtime deployments.