I use https://github.com/lukas2511/letsencrypt.sh https://github.com/lukas2511/letsencrypt.sh and it handles all the openssl stuff for you, I've found it to be

I use https://github.com/lukas2511/letsencrypt.sh https://github.com/lukas2511/letsencrypt.sh and it handles all the openssl stuff for you, I've found it to be really nice and light-weight. You just give it a directory to put the ACME challenge files in and a list of your domains