vps – Page 3 – Türker Yıldırım

Debian 12 on a host that had been on 10

NoteAugust 8, 20232 min read

Two major versions in one jump, which the documentation says not to do and which is what the situation actually was. A rebuild is the honest test of…

Rebuilding the deploy as something a stranger could run

Deep diveMay 16, 202314 min read

A deploy that one person can run, and a holiday booked for August. A runbook of 22 steps, four of which say “check it looks right”.

A backup we restored on purpose, every month, forever

Deep diveApril 5, 20238 min read

A backup that had run nightly for four years and had never been restored. The first restore produced a database missing one table.

Unattended upgrades with a reboot at 04:00

NoteFebruary 21, 20231 min read

Automatic security updates with automatic reboots, on a host that runs queue workers with no drain step. The reboot is right and the missing piece is a systemd…

Blue-green on one host, which is two directories

NoteJanuary 24, 20232 min read

The pattern does not require two machines, a load balancer or an orchestrator — it requires two copies and a pointer. mv -T on a symlink is atomic…

terraform fmt -check, so the diff is about intent

NoteDecember 21, 20222 min read

Infrastructure code is edited rarely and by different people each time, so it accumulates whitespace disagreements faster than application code. The point is not tidiness but that a…

Importing what already exists, one resource at a time

NoteNovember 11, 20222 min read

Adopting Terraform on existing infrastructure is mostly import, and import brings a resource into state without writing any configuration for it. One resource, one commit, one empty plan…

Applying a saved plan, so the review means something

NoteMay 31, 20221 min read

Re-planning at apply time means the thing that runs is not the thing that was reviewed, which defeats the review entirely. A saved plan is tied to a…

Moved blocks, and the Terraform refactor that destroyed nothing

Deep diveMarch 30, 202210 min read

1.1, and a block that renames a resource without destroying it. Renaming a module meant a plan that wanted to drop a database.

A moved block renames without destroying

NoteMarch 18, 20222 min read

Renaming a resource or moving it into a module makes Terraform plan a destroy and a create, and 1.1 lets the rename be declared instead. The value over…