构建Docker镜像时遇文件/目录不存在错误，请求协助

Alright, let's figure out why your Docker COPY command is failing and get it fixed. The error message clearly states Docker can't locate /fecode/dist in the ams-fe build stage or image—here are the most likely reasons and step-by-step checks to resolve this:

1. Verify the ams-fe build stage actually generates /fecode/dist #

The --from=ams-fe flag pulls files from a previous build stage (defined with AS ams-fe in your Dockerfile) or a pre-existing image. First, confirm this stage is properly creating the dist directory:

• Check your Dockerfile for the ams-fe stage definition. It should look something like this (adjust based on your frontend stack):

  FROM node:18 AS ams-fe
  WORKDIR /fecode  # Sets the working directory to /fecode
  COPY package*.json ./
  RUN npm install
  COPY . .
  RUN npm run build  # This command should generate the dist folder
  

• Ensure the build command (like npm run build) actually runs successfully and outputs the dist directory into /fecode. If this command fails silently or outputs to a different path, the dist folder won't exist where Docker expects it.

2. Double-check the path in the COPY command #

It’s easy to mix up paths. Here’s how to confirm:

• Temporarily add a debug step to your ams-fe stage to list the contents of /fecode:

  RUN ls -la /fecode  # Add this right after your build command
  

• Rebuild the image and look at the output—you should see the dist directory listed. If it’s missing, your build command isn’t generating it. If it’s in a different location (like /dist instead of /fecode/dist), update your COPY command to match the correct path.

3. Confirm the build stage name is correct #

Docker is case-sensitive when referencing build stages. Make sure:

• The name in COPY --from=ams-fe exactly matches the AS ams-fe definition in your Dockerfile. For example, if you wrote AS ams_fe (underscore instead of hyphen), the COPY command will fail because it can’t find the stage.

4. Rule out Docker cache issues #

Sometimes Docker uses cached build stages, which might skip steps that generate the dist directory. Try rebuilding with no cache to force a fresh build:

docker build --no-cache -t project/test:v1 .

5. Test the ams-fe stage independently #

To isolate the problem, build just the ams-fe stage and inspect it directly:

# Build only the ams-fe stage
docker build --target ams-fe -t ams-fe-test .

# Run a temporary container to check for the dist directory
docker run --rm -it ams-fe-test ls /fecode/dist

If this command returns "No such file or directory", you know the issue is entirely within the ams-fe stage—focus on fixing the build steps there to generate the dist folder.

内容的提问来源于stack exchange，提问作者Owais