参数化 Docker Image 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 .

但这行不通.由于各种原因，我真的尽量不硬编码前缀，尤其是 ${AWS::AccountId} 的一部分.

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.

这里有什么建议吗?

推荐答案

您必须在 Dockerfile 中显式声明 ARG.如果您使用 ARG 值在 FROM 行 中，则 ARG 需要位于任何 FROM 之前.(其他 ARG 需要在使用它们的每个构建阶段重复.)

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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