Docker-compose:合并/组合两个容器 [英] Docker-compose: merge/combine two containers

问题描述

我正在尝试为我的项目创建一个 docker 环境.让我解释一下.

I am trying to create a docker environment for my project. Let me explain.

我有一个名为 my-project 的项目，它产生一个战争 my-project.war.我创建了一个名为 my-project:latest 的 Docker 映像，其中包含 /my-project 目录中的 my-project.war.那很容易.

I have a project called my-project which produces a war my-project.war. I created a Docker image called my-project:latest which contains the my-project.war in the /my-project directory. That was easy.

现在我想在 docker-compose.yml.我从这个 docker-compose.yml 开始:

Now I want to combine the Docker images my-project:latest and tomcat:latest (which is the official Docker image for Tomcat) in docker-compose.yml. I started with this docker-compose.yml:

version: "3"
services:
  my-project:
    image: my-project:latest
  tomcat:
    image: tomcat:latest
    ports:
      - 8080:8080

但是我现在如何将文件 /my-project/my-project.war 从 my-project 容器复制到 webapps/tomcat 容器中的 code> 目录?这在 docker-compose 中是否可行，还是应该从新的 Dockerfile 开始?

But how can I now copy the file /my-project/my-project.war from the my-project container to the webapps/ directory in the tomcat container? Is this possible in docker-compose or should I start from a new Dockerfile?

换句话说，我在结合这两个容器时遇到了麻烦.

In other words, I am having troubles combining these two containers.

推荐答案

在 docker-compose 中你不能这样做.但是，您可以在 docker 中使用一个非常好的功能，称为 MultiStage Build

You can't do that in docker-compose. You can however use a very nice feature in docker called MultiStage Build

基本上，创建一个新的 Dockerfile 将图像合并为一个:

Basically, create a new Dockerfile to combine the images into one:

FROM my-project:latest as project

FROM tomcat:latest
COPY --from=project /my-project/my-project.war /webapps

一旦你使用 docker build -t app 构建了这个镜像. 你将拥有一个包含你在 `/webapps' 中的战争的 tomcat 镜像.

Once you build this image using docker build -t app . you will have a tomcat image that contains you war at `/webapps'.

在 docker-compose 中只使用这个图像:

In the docker-compose just use this image:

version: "3"
services:
  application:
    image: app
    ports:
      - 8080:8080

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