Can Yesod's DB be configured with environment variables?

问题

When I scaffold a new Yesod project and select e.g. PostgreSQL as the database, I get config/postgresql.yml that has the connection parameters. But I want to run my DB in one Docker container and the app in another, and link these via environment variables that contain the DB IP, port and whatnot.

How can I tell Yesod to connect to a database by using a bunch of environment variables for configuration?

回答1:

Yes, you can do this via the following environment variables:

    "PGHOST"
    "PGPORT"
    "PGUSER"
    "PGPASS"
    "PGDATABASE"

来源：https://stackoverflow.com/questions/25722740/can-yesods-db-be-configured-with-environment-variables