Thank you for your support.
I had the 2 problems, wrong port 8000 and pdf error when trying to generate.
At common_site_config.json, i changed this lines:
"restart_supervisor_on_update": true,
"restart_systemd_on_update": true,
"host_name": "https://mydomain.com"
Restarted all dockers, and issues were fixed.
ERPnext is great, thank you
Best
PS: @smino at the container info i posted, is there any sensitive data ?