In my previous blog post: Add SSL Certificate to Aviatrix Controller, we went through how to obtain a free public SSL certificate using ZeroSSL. It got great interface and you can get up to three 90 days certificate for free, but have following drawbacks:

• If you have two expired certificate, it counts as part of total three free 90 days certificate, and now you can only get one more.
• It does take a bit tickling to get a full chain certificate using commands.

Then I was introduced Posh-ACME, a PowerShell module to request and obtain free SSL certificates, let’s take a look how it works.