Container Images

FROM eclipse-temurin:17-jre as builder
WORKDIR application
ARG JAR_FILE=target/*.jar
COPY ${JAR_FILE} application.jar
RUN java -Djarmode=layertools -jar application.jar extract

FROM eclipse-temurin:17-jre
WORKDIR application
COPY --from=builder application/dependencies/ ./
COPY --from=builder application/spring-boot-loader/ ./
COPY --from=builder application/snapshot-dependencies/ ./
COPY --from=builder application/application/ ./
ENTRYPOINT ["java", "org.springframework.boot.loader.JarLauncher"]

$ docker build --build-arg JAR_FILE=path/to/myapp.jar .

Production-ready Features

The spring-boot-actuator module provides all of Spring Boot’s production-ready features.

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
</dependencies>

Endpoints

Actuator endpoints let you monitor and interact with your application. Spring Boot includes a number of built-in endpoints and lets you add your own. For example, the health endpoint provides basic application health information.

Monitoring and Management Over HTTP

If you are developing a web application, Spring Boot Actuator auto-configures all enabled endpoints to be exposed over HTTP. The default convention is to use the id of the endpoint with a prefix of /actuator as the URL path. For example, health is exposed as /actuator/health.

Loggers

• TRACE

• DEBUG

• INFO

• WARN

• ERROR

• FATAL

• OFF

• null

Deploying Spring Boot Applications

You can deploy Spring Boot applications to a variety of cloud platforms, to virtual/real machines, or make them fully executable for Unix systems.

Kubernetes

Spring Boot auto-detects Kubernetes deployment environments by checking the environment for "*_SERVICE_HOST" and "*_SERVICE_PORT" variables. You can override this detection with the spring.main.cloud-platform configuration property.

总结

快速刷完SpringBoot官方网站，刚开始还比较能看懂，越到后面越发现，整个内容偏向于“配置”说明，能吸收和理解的知识很少，从我做的笔记也是能看出来这点。

这跟SpringBoot本身的设计也是一致的，即SpringBoot是在Spring Framework基础之上做的“自动配置”，从繁杂的xml配置中解脱出来，SpringBoot本身就是一个外壳。

学习SpirngBoot，需要对它的内核进行学习，也就是Spring Framework，还好也有官方文档，虽然有点难找：

https://docs.spring.io/spring-framework/reference/overview.html