I guess i am not the only one wondering about how to issue/renew certificates for domains served by HAProxy without having to take HAProxy offline while running LE in standalone mode.
Since i can’t afford any downtime on my load-balancers i wrote a Lua plugin for HAProxy that enables http-01 domain validations against running HAProxy instances.
TL;DR
HAProxy ACME validation plugin introduces HAProxy compatibility for Let’s Encrypt’s “webroot” method.
Feedback welcome!