Moving a site to a new server: syncing files with rsync, dumping and restoring databases, testing the new box before anyone points at it, and cutting DNS over safely.

Finding the failure in journalctl and in traditional log files: filtering by time, unit and priority, and a repeatable method for diagnosing something that just broke.

How to configure a host firewall properly with ufw or firewalld, why Docker quietly punches holes through it, and where cloud security groups fit in.

A container is a process on your machine, isolated from the rest of it and shipped with everything it needs to run. Not a virtual machine — there is no…

A server exposed to the internet starts receiving automated login attempts within minutes of booting. Not because anyone is interested in you — because everything with a public IP address…

From a bare server to a site served over HTTPS with a certificate that renews itself. This assumes you have already worked through securing a new server — in particular…

By the end of this you will have nightly snapshots that each look like a complete copy while costing almost nothing in disk space, running on a schedule, logged where…

The terminal looks unwelcoming because it tells you nothing about what it can do. Everything else on this site assumes you are comfortable there; this page is how you get…