Why I Wrote a Certificate Health Script

I did not want certificate expiry to be something I discovered only after services started failing.

So I wrote a small inventory-style script that walks the certificate locations I care about, reads validity dates, and marks each file as:

  • valid
  • expiring soon
  • expired

Why this helped

The value is not the script itself. It is the shift in posture.

Instead of asking "which certificate broke this time," I can answer:

  • what exists
  • when it expires
  • which part of the PKI needs attention next

That is especially useful when one VPS is carrying multiple layers of trust material: root-related artifacts, intermediates, admin client certificates, and runtime service certificates.

What should happen next

The obvious next step is to run that check on a schedule and alert before expiry becomes an outage.

That turns certificate health from a reactive debugging problem into a small, boring operational check, which is exactly where I want it.