Turning TLS on is the easy part. Eight checks that catch the certificate failures that cause incidents: expiry, SAN drift, CA expiry and failed rotations.

Catch TLS certificate expiry before it takes a service down. Build a Prometheus, Blackbox Exporter and Alertmanager stack and alert on expiring certificates.

How Python list assignment, append, extend, copy and deepcopy behave under the hood, so you avoid subtle bugs and write more memory-efficient code.

I have been asked about tombstones in cassandra, often from users who suddenly are experiencing a slow cluster, some nasty timeouts, a…

A short blog on how to monitor SSL certificate expiry on databases such as Apache Cassandra using Prometheus and visualise on a Grafana dashboard.