As we have seen in Chapter 3, Designing a Kotlin Serverless Application, we are using Liquibase to migrate the database. Also, note that the RDS instance that we created now is in a private subnet in a VPC, and hence does not have any public accessibility. We therefore create a lambda function that can migrate the database. Its configuration is found in/resources/functions/databaseMigrator.yml.
The contents of this are as follows:
databaseMigrator: handler: com.packt.serverless.kotlin.letspoll.handlers.DatabaseMigrator environment: databaseUsername: ${env:LP_DATABASE_USERNAME} databasePassword: ${env:LP_DATABASE_PASSWORD} databaseUrl: { Fn::GetAtt: [ "letsPollDatabase", "Endpoint.Address" ] } databasePort: ${env:LP_DATABASE_PORT} ...
