问题
I am currently on the way to deploy a java application with Docker and K8s. As I am using a Raspberry Pi Kubernetes Cluster I want to generate two images, one for the x86 plattform, and one for the arm32v7 (for testing on the Raspberry cluster). The goal is to generate two differently tagged docker images with one Dockerfile and push the resulting images to Docker Hub. I use the following Dockerfile.
FROM openjdk:8-alpine as x86
RUN mkdir -p /usr/src/app
COPY project/generated/distributions/executable/launch.jar /usr/src/app
WORKDIR /usr/src/app
CMD java -jar launch.jar
FROM arm32v7/adoptopenjdk:8-jre-hotspot-bionic as arm32
RUN mkdir -p /usr/src/app
COPY project/generated/distributions/executable/launch.jar /usr/src/app
WORKDIR /usr/src/app
CMD java -jar launch.jar
My docker-compose.yml
looks like this:
version: '3.7'
services:
x86:
build:
context: .
dockerfile: Dockerfile
target: project:x86_64
arm32:
build:
context: .
dockerfile: Dockerfile
target: project:arm32
Using docker build .
works, but results in two unnamed, untagged images.mI have tried numerous things like hardcoding the path to the dockerfile and such stuff. Despite the efforts I am getting a pretty undefined error:
ERROR: failed to reach build target project:x86_64
Any idea is appreciated.
Edit: I took the idea from here
回答1:
For anyone wondering, I figured it out with a little help.
The target definiton inside the build part of the docker-compose.yml is NOT to define the target image. It defines the target stage. To specify a image add the image portion to the multiple stages. Also no blank lines between the commands inside the Dockerfile, the interpreter will stop after a blank line. Here is the corrected, working code:
Dockerfile:
FROM openjdk:8-alpine as x86
RUN mkdir -p /usr/src/app
COPY project/generated/distributions/executable/launch.jar /usr/src/app
WORKDIR /usr/src/app
CMD java -jar launch.jar
FROM arm32v7/adoptopenjdk:8-jre-hotspot-bionic as arm32
RUN mkdir -p /usr/src/app
COPY project/generated/distributions/executable/launch.jar /usr/src/app
WORKDIR /usr/src/app
CMD java -jar launch.jar
And docker-compose.yml:
version: '3.7'
services:
x86:
build:
context: .
dockerfile: Dockerfile
target: x86
image: foo.bar.example:x86_64
arm32:
build:
context: .
dockerfile: Dockerfile
target: arm32
image: foo.bar.example:arm32
来源:https://stackoverflow.com/questions/61017559/building-two-differently-tagged-docker-images-with-docker-compose