How Can I Use Environment Variables to Configure Database Connections in My Spring Boot Application?

Using Environment Variables in Spring Boot's application.properties

In Spring Boot, we often encounter the need to set application properties dynamically based on the environment we are deploying to. In your case, you have a Spring Boot application that runs locally, on Jenkins, and on OpenShift. To address this challenge, you have decided to utilize environment variables to specify database connection details.

To access environment variables in application.properties, you can directly reference them using the ${} syntax. For instance, to set the database URL, you can use:

spring.datasource.url = ${OPENSHIFT_MYSQL_DB_HOST}:${OPENSHIFT_MYSQL_DB_PORT}/"nameofDB"

Similarly, you can set the username, password, and port using:

spring.datasource.username = ${OPENSHIFT_MYSQL_DB_USERNAME}
spring.datasource.password = ${OPENSHIFT_MYSQL_DB_PASSWORD}
spring.datasource.port = ${OPENSHIFT_MYSQL_DB_PORT}

It's important to ensure that these environment variables are set correctly in your different environments. Locally and on the Jenkins virtual machine, you have already created the necessary variables. For OpenShift, you can set them using the OpenShift deployment configuration or directly in the pod environment.

By utilizing environment variables in this way, you can make your application more portable and adaptable to different deployment environments.

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