创建 Azure 容器注册表任务时，如何在文件夹中引用 Dockerfile？

Question

I am trying to setup an Azure Container Registry (ACR) to automatically build Docker images when I commit changes to my Git repository.

The problem I'm having is that my Dockerfile is in a folder within the respository. This works, in that Azure retrieves the source code and starts to build the Docker image. However, the Dockerfile refers to files relative to the location of the Dockerfile (ie inside the folder). When the ACR Task tries to build the image, it complains that the files can't be found. I suspect it's because it's looking for them in the root of the repository, not in the same folder as the Dockerfile.

Here's how I created the Task:

az acr task create -n MyName -r MyRegistry -c https://mySourceRepository -f MyFolder/Dockerfile -t myimage:{{.Run.ID}} --git-access-token <removed>

The first portion of the Dockerfile looks like this:

FROM node:12.16.1-alpine AS build

WORKDIR /usr/src/app
COPY package.json package-lock.json ./
RUN npm install

And the ACR log says this...

Status: Downloaded newer image for node:12.16.1-alpine
 ---> f77abbe89ac1
Step 2/9 : WORKDIR /usr/src/app
 ---> Running in 22b362ab217c
Removing intermediate container 22b362ab217c
 ---> ee3d0930d0e9
Step 3/9 : COPY package.json package-lock.json ./
COPY failed: stat /var/lib/docker/tmp/docker-builder883638973/package.json: no such file or directory

Is there a way to specify a 'working folder' within the source repository for the ACR Task?

Answer 1

For this issue, you can first take a look at the context of the docker build . As it shows, I recommend you make some changes to the Dockerfile. The best way is to put the Dockerfile in the root folder of the repository, and then copy files in the Dockerfile with a relative path according to the root folder.

Of course, you can keep the current directory structure, then you need to change the COPY path relate to your Git repository root folder.

Answer 2

The solution to this was to specify the folder to use as part of the Context parameter:

az acr task create -n MyName -r MyRegistry -c https://mySourceRepository#:MyFolder -f Dockerfile -t myimage:{{.Run.ID}} --git-access-token <removed>

This causes the Docker Build operation to start in the specified folder, so the Dockerfile can find the files to which it refers.

See here for details of Docker Build Contexts .