How does Docker dynamically transfer parameters to the Springboot project?

Scenario

Suppose there is a springboot project, which has a database configuration item, but different database test environments (dev\sit\uat), how many database IPs are there? If you want to use the same springboot project image, you can switch the database configuration at any time. Simply put, the database configuration of your springboot application should be passed in from the outside, not hardcode.

There is a database configuration in the springboot application as follows:

Solution

Use spelexpression, dynamic Get the database configuration from environment variables

Next we replace the database configuration with spel expression in the springboot configuration file

Indocker -compose.ymlConfigure our database parameters

So that our springboot application can dynamically obtain the database configuration when starting the container service

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