Link subdomain to docker (NGINX) This section assumes an NGINX docker and you have setup your DNS to connect to you NAS via a wildcard.   1) Enable Telnet on the NAS in Control Panel   2) Telnet into the NAS, I prefer putty 3) cd into the folder you can easily access or edit (in my case, a network shared folder,  execute, in the terminal screen "docker ps" to find the id of your container     docker ps docker cp c0568abcdb83916:/etc/nginx/nginx.conf tmp_tim.conf   then edit, the config file for nginx, and do the reverse:   docker cp tmp_tim.conf c0568abcdb83916:/etc/nginx/nginx.conf   Restart the container.