Spring Boot Tutorial 0/110 lessons ~6 min read Lesson 87“Production-grade backends”

Environment Variables

Twelve-factor app rule #3: store config in the environment.

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Focus

2 guided sections

Practice signal

Examples included

Career prep

Foundation builder

Introduction

Twelve-factor app rule #3: store config in the environment. Spring Boot maps SPRING_DATASOURCE_URL automatically to spring.datasource.url.

Informative example

bash

# Local
export SPRING_PROFILES_ACTIVE=dev
export DB_PASSWORD=secret
./mvnw spring-boot:run

# Docker
docker run -e SPRING_PROFILES_ACTIVE=prod -e DB_PASSWORD=${DB_PASSWORD} acme/orders

# Kubernetes secret → env
env:
  - name: DB_PASSWORD
    valueFrom: { secretKeyRef: { name: orders, key: db-password } }

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