Differences version 4 and 5 - invoiceninja/dockerfiles GitHub Wiki
Environment variables
The amount and names of environment variables differ from version 4 to 5.
Examples
In version 4 you specified the database connection with these environment variables:
DB_HOST
DB_USERNAME
DB_PASSWORD
DB_DATABASE
In version 5, that supports multiple database connections, you do it with:
DB_HOST1
DB_DATABASE1
DB_USERNAME1
DB_PASSWORD1
So please make sure you know which version you are running and therefore which variable to use.