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In a CI/CD pipeline, a Docker build fails with "COPY failed: file not found." What should you check first?

medium📝 Troubleshoot Q7 of 15
Docker - in CI/CD
In a CI/CD pipeline, a Docker build fails with "COPY failed: file not found." What should you check first?
AIf the container is already running
BIf the source files exist in the build context directory
CIf the Docker daemon is running
DIf the image is pushed to the registry
Step-by-Step Solution
Solution:

  1. Step 1: Understand the COPY command failure

    "COPY failed: file not found" means Docker cannot find the files to copy during image build.

  2. Step 2: Check build context directory

    Ensure the files exist in the directory sent as build context to Docker.

  3. Final Answer:

    If the source files exist in the build context directory -> Option B

  4. Quick Check:

    COPY error = missing source files [OK]
Quick Trick: Verify source files exist in build context for COPY [OK]
Common Mistakes:
  • Checking Docker daemon for COPY errors
  • Looking for running containers instead
  • Assuming image push affects COPY command

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