[Solved] You have this GitHub Actions step: run: docker build -t myapp . run: docker run myapp The workflow fails with 'Error: Dockerfile not found'. What is the likely cause? | Docker

Docker - in CI/CD

You have this GitHub Actions step:

run: docker build -t myapp .
run: docker run myapp

The workflow fails with 'Error: Dockerfile not found'. What is the likely cause?

AThe Dockerfile is missing in the repository

BThe two 'run' commands are separate steps and do not share state

CThe image name 'myapp' is invalid

DThe 'docker run' command syntax is incorrect

Step-by-Step Solution

Solution:

Step 1: Understand docker build requirement
The 'docker build .' command requires a Dockerfile in the current directory (repo root after checkout).
Step 2: Identify the error cause
If the Dockerfile is missing from the repository, the build step fails with 'Dockerfile not found' error.
Final Answer:
The Dockerfile is missing in the repository -> Option A
Quick Check:
docker build fails = no Dockerfile [OK]

Quick Trick: Ensure Dockerfile exists in repository root [OK]

Common Mistakes:

Master "in CI/CD" in Docker

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