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Idev.d

Posted on Originally published at idev.my

Complete Guide to Dockerizing Spring Boot Applications

Optimized Dockerfile

Use multi-stage builds to minimize image size: the first stage compiles with the maven image, the second uses eclipse-temurin:17-jre-alpine as the runtime base. Final image size can shrink from 800MB+ to under 200MB.

Layered JARs

Spring Boot 3.x supports layered JARs, splitting the application into dependencies, spring-boot-loader, snapshot-dependencies, and application layers. Leveraging Docker's layer caching, only changed layers need rebuilding.

Docker Compose Orchestration

Use Docker Compose to manage dependencies between application, MySQL, Redis, and other services. Use depends_on and healthcheck to ensure services start in the correct order.


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