Update readme with sample using docker-compose version '3'

[evertramos]

Hi there!

Thanks for the good work and I would like to share a new sample.

Cheers!

[buchdag]

@evertramos your docker-compose configuration won't reload nginx on automated certificate renewal and serve the renewed certificates due to the absence of the NGINX_PROXY_CONTAINER environment variable.

See the last bullet point there and the relevant PR.

[evertramos]

Thanks for the comment @buchdag,

I have the option in the jrcs/docker-letsencrypt-nginx-proxy-companion container, as of:

environment:
      NGINX_DOCKER_GEN_CONTAINER: "nginx-gen"

Isn´t that right? Or I must have specify it somewhere else?

[buchdag]

If you use a docker-compose version 3 file with the three container setup (nginx / docker-gen / letsencrypt) you actually have to specify both environment variable on the letsencrypt container:

NGINX_PROXY_CONTAINER pointing to the nginx container itself
NGINX_DOCKER_GEN_CONTAINER pointing to the docker-gen container as you did

[evertramos]

@buchdag

So it would be like this:

nginx-letsencrypt:
[...]
environment:
      NGINX_DOCKER_GEN_CONTAINER: "nginx-gen"
      NGINX_PROXY_CONTAINER: "nginx"

Is that it?

Thank you very much for your attention on that! It would take me 90 days to realize it.

[buchdag]

Yep, that's it !