Use Let's Encrypt

[tomerf-sndbox]

Please update the script to use the common Let's Encrypt certificates instead.

[davidmoten]

Sounds great, can you contribute it?

[strycore]

One thing to make sure to update is the configuration for the EC2 instance. It needs to be open to HTTP requests as well so that Let's Encrypt can set up the certificate. Certbot can then setup a redirection from HTTP to HTTPS with Apache.