Best way to create new 'production' docker contained app with external DB

[George]

That is a good best practice indeed. Use the database with docker just for small sized projects. For larger projects use a managed RDS from Amazon RDS or Digital Ocean managed database.

The error above shows that a wrong address is used to connect, see:

Creating Database Connections with the Database Manager

A lot of new power comes with the new Database Manager in Wappler. You can quickly connect your project to all kind of databases you want to use in it. There is a wide range of databases that you can fully manage from within Wappler. You can start with simple local SQLite database and grow to more strong high availability database servers like MySQL, MariaDB, PostgreSQL and Microsoft SQL Server. You can choose to run those servers on your local machine during development and also have them …