📰 Dev.to · ntoledo319

A CI run that was green last week is red today and nobody touched main. Most of the time this is a calendar cutoff, not a bug — here's how to tell which one hit

A single map from "which deprecated AWS runtime am I leaving" to "which errors will I hit, in what order" — Python 3.9→3.12, Python→3.13, Node 18/20→22, and Ama

Scripts, Dockerfiles, and user-data that call amazon-linux-extras fail outright on Amazon Linux 2023 — the command doesn't exist there. Here's what replaces it.

User-data, cloud-init, or Ansible that enables ntpd.service fails on Amazon Linux 2023 with "Unit ntpd.service not found." Here's why, and how to move to chrony

Python 3.12 removed smtpd, asyncore, and asynchat from the standard library. Why old Lambda code breaks on the runtime bump, and the replacement for each.

A yum/dnf install that worked on Amazon Linux 2 fails with "Unable to find a match" on Amazon Linux 2023. Why package names changed and how to find the real one

"Cannot find module" after a Lambda runtime bump has four common root causes that look identical in the logs. A decision tree to identify which one you actually

Upgrading Lambda to nodejs18.x or later? AWS SDK v2 is no longer bundled. The exact error, why it happens, and a complete guide to migrating to @aws-sdk v3 modu

Amazon Linux 2 reaches end of life June 30, 2026. What changes on AL2023 (dnf, extras, chronyd, nftables, Python), and a step-by-step migration checklist.