when I use maven to build my spring boot app the application needs to have a connection to my postgresql database in the application.properties. It only can connect when I use
spring.datasource.url=jdbc:postgresql://localhost:5432/springbootdb
but when I containerize the buileded jar file, my application can't connect to my postgres database hosted outside the Container.
what is the solution for this problem?
I am still a Beginner
From the 18.03 docs:
I want to connect from a container to a service on the host
The host has a changing IP address (or none if you have no network access). From 18.03 onwards our recommendation is to connect to the special DNS name host.docker.internal, which resolves to the internal IP address used by the host.
The gateway is also reachable as gateway.docker.internal.
example:
spring.datasource.url=jdbc:postgresql://host.docker.internal:5432/springbootdb
Where you hosted your PostgreSQL database?
Replace localhost with actual machine IP address (PostgreSQL database machine address)
spring.datasource.url=jdbc:postgresql:<ip_address>:5432/springbootdb
