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Prerequisites : the letsencrypt CLI tool

This method allows your to generate and renew your Lets Encrypt certificates with 1 command. This is easily automatable to renew each 60 days, as advised.

You need nginx to answer on port 80 on all the domains you want a certificate for. Then you need to serve the challenge used by letsencrypt on /.well-known/acme-challenge. Then we invoke the letsencrypt command, telling the tool to write the challenge files in the directory we used as a root in the nginx configuration.

I redirect all HTTP requests on HTTPS, so my nginx config looks like :

server {

britishtea

require 'function'

# A fibonacci function.

fib = Function.new
fib[0]       = 0
fib[1]       = 1
fib[Integer] = ->(i) { fib[i - 2] + fib[i - 1] }

p fib[0]  # => 0