参数化Docker映像前缀 [英] Parameterising Docker Image prefix

问题描述

我有一个包含以下内容的Dockerfile

I have a Dockerfile which has the following content

# Build
FROM ${ECR_PREFIX}/maven:3.6.3-jdk-11 AS build
COPY src /home/app/src
COPY pom.xml /home/app
RUN mvn -f /home/app/pom.xml clean package

# Package
FROM ${ECR_PREFIX}/openjdk:11-jre-slim
COPY --from=build /home/app/target/application.jar application.jar
EXPOSE 8080
ENTRYPOINT ["java", "-jar", "application.jar"]

我尝试使用

export PREFIX=${AWS::AccountId}.dkr.ecr.${AWS::Region}.amazonaws.com
docker build -t backend --build-arg ECR_PREFIX=$PREFIX .

但是这行不通.出于各种原因，我真的在尝试不对前缀进行硬编码，尤其是其中的 $ {AWS :: AccountId} 部分.

but this would not work. I am really trying not to hard code the prefix especially ${AWS::AccountId} part of it because of various reasons.

这里有指针吗?

推荐答案

您必须在Dockerfile中显式声明 ARG .如果您使用 ARG 值放在 FROM 行中，则 ARG 必须在任何 FROM 之前.(其他 ARG 需要在使用它们的每个构建阶段中重复.)

You have to explicitly declare the ARG in your Dockerfile. If you use an ARG value in a FROM line then the ARG needs to come before any FROM. (Other ARGs need to be repeated in each build stage that uses them.)

ARG REGISTRY=docker.io
FROM ${REGISTRY}/maven:3.6.3-jdk-11 AS build

REGISTRY=${AWS_ACCOUNT_ID}.dkr.ecr.${AWS_REGION}.amazonaws.com
docker build \
  -t $REGISTRY/backend:$(git rev-parse HEAD) \
  --build-arg REGISTRY=$REGISTRY \
  .

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