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Fix a few indentation issues and content on multi-stage concept (#19942) 

Signed-off-by: Michael Irwin <mikesir87@gmail.com>
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Michael Irwin 2024-05-08 14:49:02 -04:00 committed by GitHub
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15
content/guides/docker-concepts/building-images/multi-stage-builds.md
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@ -120,10 +120,10 @@ In this hands-on guide, you'll unlock the power of multi-stage builds to create
@SpringBootApplication @SpringBootApplication
public class SpringBootDockerApplication { public class SpringBootDockerApplication {
@RequestMapping("/") @RequestMapping("/")
public String home() { public String home() {
return "Hello World"; return "Hello World";
} }
public static void main(String[] args) { public static void main(String[] args) {
SpringApplication.run(SpringBootDockerApplication.class, args); SpringApplication.run(SpringBootDockerApplication.class, args);
@ -259,14 +259,15 @@ Now that you have the project, you’re ready to create the `Dockerfile`.
1. Consider the following Dockerfile: 1. Consider the following Dockerfile:
```dockerfile ```dockerfile
FROM eclipse-temurin:21.0.2_13-jdk-jammy as builder FROM eclipse-temurin:21.0.2_13-jdk-jammy AS builder
WORKDIR /opt/app WORKDIR /opt/app
COPY .mvn/ .mvn COPY .mvn/ .mvn
COPY mvnw pom.xml ./ COPY mvnw pom.xml ./
RUN ./mvnw dependency:go-offline RUN ./mvnw dependency:go-offline
COPY ./src ./src COPY ./src ./src
RUN ./mvnw clean install RUN ./mvnw clean install
FROM eclipse-temurin:21.0.2_13-jre-jammy as final
FROM eclipse-temurin:21.0.2_13-jre-jammy AS final
WORKDIR /opt/app WORKDIR /opt/app
EXPOSE 8080 EXPOSE 8080
COPY --from=builder /opt/app/target/*.jar /opt/app/*.jar COPY --from=builder /opt/app/target/*.jar /opt/app/*.jar
@ -277,7 +278,7 @@ Now that you have the project, you’re ready to create the `Dockerfile`.
- The first stage remains the same as the previous Dockerfile, providing a Java Development Kit (JDK) environment for building the application. This stage is given the name of builder. - The first stage remains the same as the previous Dockerfile, providing a Java Development Kit (JDK) environment for building the application. This stage is given the name of builder.
- The second stage is a new stage named `final`. Since it starts `FROM builder`, it inherits everything from the base stage (JDK environment). It uses a slimmer `eclipse-temurin:21.0.2_13-jre-jammy` image, containing just the Java Runtime Environment (JRE) needed to run the application. This image provides a Java Runtime Environment (JRE) which is enough for running the compiled application (JAR file). - The second stage is a new stage named `final`. It uses a slimmer `eclipse-temurin:21.0.2_13-jre-jammy` image, containing just the Java Runtime Environment (JRE) needed to run the application. This image provides a Java Runtime Environment (JRE) which is enough for running the compiled application (JAR file).
> For production use, it's highly recommended that you produce a custom JRE-like runtime using jlink. JRE images are available for all versions of Eclipse Temurin, but `jlink` allows you to create a minimal runtime containing only the necessary Java modules for your application. This can significantly reduce the size and improve the security of your final image. [Refer to this page](https://hub.docker.com/_/eclipse-temurin) for more information. > For production use, it's highly recommended that you produce a custom JRE-like runtime using jlink. JRE images are available for all versions of Eclipse Temurin, but `jlink` allows you to create a minimal runtime containing only the necessary Java modules for your application. This can significantly reduce the size and improve the security of your final image. [Refer to this page](https://hub.docker.com/_/eclipse-temurin) for more information.