How to install a letsencrypt cert with nginx?

I've used letsencrypt to install an SSL cert for the latest nginx on ubuntu. The setup is fine and works great with the exception of:

I don't know enough about SSL to know what's going on but I have a suspicion: I installed the SSL cert for Apache a while back and just now moved to Nginx for it's http/2 support. As the nginx plugin is not stable yet I had to install the cert myself and this is what I did:

In my nginx config (/etc/nginx/conf/default.conf) I added:

server {
    listen       80;
    server_name  [domain];
    return 301   https://$host$request_uri;
}

server {
    listen       443 http2;
    listen       [::]:443 http2;
    server_name  [domain];

    ssl on;
    ssl_certificate /etc/letsencrypt/live/[domain]/cert.pem;
    ssl_certificate_key /etc/letsencrypt/live/[domain]/privkey.pem;
}

Is it possible that this breaks the chain somehow? What is the proper way here?

Thanks guys