bash – Page 2 – Türker Yıldırım

A rolling update in twenty lines of shell

NoteJanuary 23, 20251 min read

Compose has no rolling update, and the thing it does not have is twenty lines of shell for a two-replica service. Scaling up, waiting for health, then removing…

Handing over on-call to one other person

Deep diveMay 8, 202410 min read

One person who can fix anything, and a rota of one. Three years of incidents resolved by the same person, every time.

A shell script that should have been a program

NoteApril 4, 20242 min read

A deployment script that had grown to six hundred lines of bash with functions, associative arrays and a retry loop. Bash is the right tool for orchestrating commands…

Reproducing a build from six months ago

Deep diveJanuary 4, 202414 min read

A security question about a release from July, and no way to rebuild it. The same commit produces a different image, and neither of them is wrong.

Import blocks, and the resources we had been pretending to manage

Deep diveSeptember 21, 202310 min read

Terraform 1.5 in June, and an import that is part of the plan rather than a side effect. Fourteen resources created by hand in 2019.

The state file two people wrote to at once

Deep diveJuly 14, 202310 min read

Two pipelines, one state file, and a plan that proposed deleting a database. A lock held by a run cancelled forty minutes earlier.

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.

Larger runners, and the pipeline that was memory-bound

Deep diveDecember 13, 202210 min read

October, larger runners, and a build that was swapping. A Node build that used 6 GB on a 7 GB runner.

A pipeline that only builds what changed

Deep diveNovember 15, 202210 min read

A 22-minute pipeline on a repository where most changes touch one directory. Every push runs everything, including the untouched.