我对我的 Dockerfile 进行了更改，但我的“docker build”并未反映更改

Question

I'm learning how to use docker, this docker image is being built with a Spring Boot REST API that was running fully local.

我的第一个 docker 图像如下

FROM amazoncorretto:11-alpine-jdk as build
WORKDIR /workspace/app

COPY mvnw .
COPY .mvn .mvn
COPY pom.xml .
COPY src src

RUN ./mvnw install -DskipTests
RUN mkdir -p target/dependency && (cd target/dependency; jar -xf ../*.jar)

FROM amazoncorretto:11-alpine-jdk
RUN addgroup -S spring && adduser -S spring -G spring
USER spring:spring
ARG DEPENDENCY=target/dependency
COPY ${DEPENDENCY}/BOOT-INF/lib /app/lib
COPY ${DEPENDENCY}/META-INF /app/META-INF
COPY ${DEPENDENCY}/BOOT-INF/classes /app
ENTRYPOINT ["java","-cp","app:app/lib/*","com.helloyou.demo.DemoApplication"]

当我第一次运行命令docker build -t myapp. 我得到了这个结果

jamal@DESKTOP-64JJ5P8:~/dev/hello-you-endpoint$ docker build -t fer2ap/app .
[+] Building 7.5s (9/9) FINISHED
 => [internal] load build definition from Dockerfile                                                                                2.2s
 => => transferring dockerfile: 38B                                                                                                 0.0s
 => [internal] load .dockerignore                                                                                                   3.1s
 => => transferring context: 2B                                                                                                     0.0s
 => [internal] load metadata for docker.io/library/amazoncorretto:11-alpine-jdk                                                     1.9s
 => [stage-1 1/5] FROM docker.io/library/amazoncorretto:11-alpine-jdk@sha256:76acd2ab267cb71abeab875af97d91fb483d81bc4e372d1dd28ba  0.0s
 => [internal] load build context                                                                                                   1.4s
 => => transferring context: 2B                                                                                                     0.0s
 => CACHED [stage-1 2/5] RUN addgroup -S spring && adduser -S spring -G spring                                                      0.0s
 => ERROR [stage-1 3/5] COPY /workspace/app/target/dependency/BOOT-INF/lib /app/lib                                                 0.0s
 => ERROR [stage-1 4/5] COPY /workspace/app/target/dependency/META-INF /app/META-INF                                                0.0s
 => ERROR [stage-1 5/5] COPY /workspace/app/target/dependency/BOOT-INF/classes /app                                                 0.0s
------
 > [stage-1 3/5] COPY /workspace/app/target/dependency/BOOT-INF/lib /app/lib:
------
------
 > [stage-1 4/5] COPY /workspace/app/target/dependency/META-INF /app/META-INF:
------
------
 > [stage-1 5/5] COPY /workspace/app/target/dependency/BOOT-INF/classes /app:
------
failed to compute cache key: "/workspace/app/target/dependency/BOOT-INF/classes" not found: not found

起初我认为这是WORKDIR和ARG DEPENDENCY的错误。 所以我对其进行了更改，以匹配我的项目的绝对路径~/dev/hello-you-endpoint 。 改后的Dockerfile是这样的

FROM amazoncorretto:11-alpine-jdk as build
WORKDIR dev/hello-you-endpoint
COPY mvnw .
COPY .mvn .mvn
COPY pom.xml .
COPY src src
RUN ./mvnw install
RUN mkdir -p target/dependency && (cd target/dependency; jar -xf ../*.jar)
FROM amazoncorretto:11-alpine-jdk
VOLUME /tmp
RUN addgroup -S spring && adduser -S spring -G spring
USER spring:spring
ARG DEPENDENCY=dev/hello-you-endpoint/target/dependency
COPY ${DEPENDENCY}/BOOT-INF/lib /app/lib
COPY ${DEPENDENCY}/META-INF /app/META-INF
COPY ${DEPENDENCY}/BOOT-INF/classes /app
ENTRYPOINT ["java","-cp","app:app/lib/*","com.helloyou.demo.DemoApplication"]

当我运行docker build -t myapp. 我得到了相同的 output failed to compute cache key: "/workspace/app/target/dependency/BOOT-INF/lib" not found: not found 。

jamal@DESKTOP-64JJ5P8:~/dev/hello-you-endpoint$ docker build -t fer2ap/app .
[+] Building 8.6s (10/10) FINISHED
 => [internal] load build definition from Dockerfile                                                                                3.3s
 => => transferring dockerfile: 38B                                                                                                 0.0s
 => [internal] load .dockerignore                                                                                                   2.1s
 => => transferring context: 2B                                                                                                     0.0s
 => [internal] load metadata for docker.io/library/amazoncorretto:11-alpine-jdk                                                     3.2s
 => [auth] library/amazoncorretto:pull token for registry-1.docker.io                                                               0.0s
 => [internal] load build context                                                                                                   1.4s
 => => transferring context: 2B                                                                                                     0.0s
 => [stage-1 1/5] FROM docker.io/library/amazoncorretto:11-alpine-jdk@sha256:76acd2ab267cb71abeab875af97d91fb483d81bc4e372d1dd28ba  0.0s
 => CACHED [stage-1 2/5] RUN addgroup -S spring && adduser -S spring -G spring                                                      0.0s
 => ERROR [stage-1 3/5] COPY /workspace/app/target/dependency/BOOT-INF/lib /app/lib                                                 0.0s
 => ERROR [stage-1 4/5] COPY /workspace/app/target/dependency/META-INF /app/META-INF                                                0.0s
 => ERROR [stage-1 5/5] COPY /workspace/app/target/dependency/BOOT-INF/classes /app                                                 0.0s
------
 > [stage-1 3/5] COPY /workspace/app/target/dependency/BOOT-INF/lib /app/lib:
------
------
 > [stage-1 4/5] COPY /workspace/app/target/dependency/META-INF /app/META-INF:
------
------
 > [stage-1 5/5] COPY /workspace/app/target/dependency/BOOT-INF/classes /app:
------
failed to compute cache key: "/workspace/app/target/dependency/BOOT-INF/lib" not found: not found

我认为收到同样的错误很奇怪，所以我一直试图找出问题所在。 我删除了我的 Dockerfile 中的所有内容，我得到了同样的错误failed to compute cache key: "/workspace/app/target/dependency/BOOT-INF/classes" not found: not found 。

在写这个问题之前，我发现了一些类似的案例（ 我的 dockerfile 的更改在运行 `docker build` 时没有反映出来）但是他们的解决方案都不适合我。 我做了一些研究，对 docker 缓存有所了解，但docker build --no-cache -t myapp. 也没有用。

在尝试使用多层支持构建映像之前，我使用 docker 教程（ https://spring-io/spring-guides/gs ）进行了第一次 spring 引导在入门教程结束时，我有以下 Dockerfile。 我尝试用它构建我的图像，但它现在也无法正常工作，当使用这个 Dockerfile 时，我得到与上述相同的错误， failed to compute cache key: "/workspace/app/target/dependency/BOOT-INF/lib" not found: not found 。

FROM amazoncorretto:11-alpine-jdk
RUN addgroup -S spring && adduser -S spring -G spring
USER spring:spring
ARG DEPENDENCY=target/dependency
COPY ${DEPENDENCY}/BOOT-INF/lib /app/lib
COPY ${DEPENDENCY}/META-INF /app/META-INF
COPY ${DEPENDENCY}/BOOT-INF/classes /app
ENTRYPOINT ["java","-cp","app:app/lib/*","com.helloyou.demo.DemoApplication"] 

文件结构：我的 Dockerfile、mvnw、pom.xml 和我的应用程序的源文件夹位于 /home/jamal/dev/hello-you-endpoint/

Answer 1

你可以构建你的 dockerfile 作为这个例子

FROM golang AS build-stage
RUN go get -u github.com/LK4D4/vndr

FROM scratch AS export-stage
COPY --from=build-stage /go/bin/vndr /