Postgres as Backend database

I have a Postgres Database on the server I want to deploy Metabase. I am trying to use the docker image with the Postgres config but find difficult to find my Database’s host . Is it the IP of my server? Do I need to put anything else? Also I want to run it in port 80, in order to make it easy for the user to access from the browser without the need of knowing the port.

These is the command that I’m using:

docker run -d -p 3000:3000 \
-e “MB_DB_TYPE=postgres”
-e “MB_DB_DBNAME=metabase”
-e “MB_DB_PORT=5432”
-e “MB_DB_USER=”
-e “MB_DB_PASS=”
-e “MB_DB_HOST=my-database-host”
–name metabase metabase/metabase