Connect from Spring boot app running on Google Cloud Run to a Cloudsql without GCP starter

Question

I have a Spring boot app running on Google Cloud Run, and I want to connect to a postgres instance running on Google Cloudsql. I am able to connect using Spring Cloud GCP starter project.

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-gcp-starter-sql-postgresql</artifactId>
</dependency>

But I don't want to add this dependency.

I was able to connect from my local app by using using the postgressql plugin and specifying spring.datasource.url=*** after creating a Cloud proxy.

But when I tried doing the same from cloud run after using gcloud beta run deploy --add-cloudsql-instances <INSTANCE-ID> it doesn't work. According to https://cloud.google.com/run/docs/configuring/connect-cloudsql , --add-cloudsql-instances automatically creates a Cloud proxy. So why doesn't it work?

Thanks.

Answer 1

This doesn't work because Java doesn't support Unix domain sockets. The Spring Cloud GCP circumvents this by using the Cloud SQL JDBC Socket Factory .

You can use the Socket Factory directly by adding it your your pom (and updating your URL as specified in the README).