The Production Operations series is a set of real incident reviews on Cloud VPS and Kubernetes, following symptom, investigation, root cause, fix and prevention: OOM, hanging PHP-FPM, slow MySQL, cache session leaks, WAF ...
A CI pipeline goes weeks without a single changed line, then suddenly fails at the step that uses git over SSH with the message OpenSSL version mismatch. Whoever picks it up usually starts trying thin...
A very common configuration change on Kubernetes: changing dbHost in the values of a batch of sites, for example when moving the database from an in-cluster MySQL StatefulSet to a dedicated MySQL VPS....
In a GitOps setup, the pipeline that creates a website on Kubernetes usually ends with one step: commit the new site's values file to the Helm repo, then git push. When several pipelines run at once,...
A website returning 502 can be failing because of nginx on the balancer, PHP-FPM on the minion, a query locking a table on the database, or, on Kubernetes, a pod that was just killed for exceeding its...
