As the title suggests, this is a short technical post.

I spent too much time today trying to figure out how to fix my GitLab pipeline after upgrading the Ruby version in a Rails app from 3.4.2 to 3.4.5.

The Problem

I have two jobs that connect to the MySQL 8.4 database service: one for testing migrations and one for the RSpec test suite. Both jobs failed quickly with the following error message:

ERROR 2026 (HY000): TLS/SSL error: self-signed certificate in certificate chain
bin/rails aborted!
failed to execute: `mysql`

The solution

I'm still not sure what the root cause of the issue is, but I think it's related to the Ruby Docker images I use. I've switched from ruby:3.4.2-slim to ruby:3.4.5-slim. I realized that I have to disable SSL certificate verification within the MariaDB client, so i added the following to my Dockerfile:

RUN touch ~/.my.cnf
RUN echo "[client] \ndisable-ssl-verify-server-cert" >> ~/.my.cnf

And voilà, my jobs are running like a charm again!

I hope this is helpful for you. Please bear in mind that disabling the SSL connection is usually undesirable in production environments. Have a good day and happy debugging!

#ruby #ruby345 #rails8 #mysql2gem #debugging #rails

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