Generate a SSL certificate for the current host (without having to change the DNS).

On any linux version that supports snap. For example out of the box Ubuntu 16+ or Ubuntu 14.04 after installing snapd.

Note: that not all hostnames are allowed when using letsencrypt. You can’t for example use a “*.compute.amazonaws.com” hostname. 

Install Docker:

sudo snap install docker

Generate Certificate

Create folder to store certificates:

mkidr letsencrypt

Generate Certificate using docker (make sure the port 80 is accessible on the server):

sudo docker run -p 80:80 -v ${PWD}/letsencrypt:/etc/letsencrypt -it certbot/certbot certonly

Follow on-screen instructions. When prompted to select how to authenticate, select “Spin a temporary Server”:

How would you like to authenticate with the ACME CA?
1: Spin up a temporary webserver (standalone)
2: Place files in webroot directory (webroot)
Select the appropriate number [1-2] then [enter] (press 'c' to cancel): 1

References


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