Auto Renew Let’s Encrypt Certificates
I’m a big fan of Let’s Encrypt (free, widely trusted SSL certificates) but not a big fan of most of the client software available for requesting and renewing certificates. Unlike a typical certificate authority, Let’s Encrypt doesn’t have a webui for requesting/renewing certs; everything is driven via an automated process that is run between a Let’s Encrypt software client and the Let’s Encrypt web service.
Since the protocols that Let’s Encrypt uses are standards-based, there are many open source clients available. Being security conscious, I have a few concerns with most of the clients:
- Complication. Many of the clients are hundreds of lines long and unnecessarily complicated. This makes the code really hard to audit and since this code is playing with my crypto key material, I do want to audit it.
- Elevated privilege. At least one of the clients I saw required root permission. That’s a non starter.
I can’t remember how, but I discovered a very clean, very simple client called acme-tiny at github.com/diafygi/acme-tiny. This script was obviously written by someone who shares the same concerns as I do and I highly recommend it to others.
I used acme-tiny to request my initial certificates — and it Continue reading

Tapping into the growth of high performance computing.
Drones are deployed at the cellular edge.
For a good point of reference, check out SDxCentral’s SD-WAN/vCPE report.