Error: unable to prepare context: path “ ” not found while building and tagging docker image

问题

In continuation of my previous question

I am trying to build and push a docker image to Amazon ECR with GitHub Actions by following this tutorial

But I am getting the following error :

Run docker build \ 
unable to prepare context: path " " not found

Can anyone help me resolve this issue??

Edit 1:

As stated by @banyan I have created an app directory

But still I am getting the same error.

To know more, please go through this

回答1:

There is issue in this line of your dockerfile:

docker build \ -t $CONTAINER_IMAGE \ -t $AWS_ACCOUNT_ID.dkr.ecr.$AWS_DEFAULT_REGION.amazonaws.com/$CONTAINER_IMAGE ./app

docker build command syntax is :

docker build [OPTIONS] PATH | URL | -

If we use -t option then we specify container image name.

In the above command since you have used two -toptions so after first -t everything is used as path to dockerfile which is wrong, because of which this error is coming unable to prepare context: path " " not found.

So, the correct syntax should be:

docker image build -t $AWS_ACCOUNT_ID.dkr.ecr.$AWS_DEFAULT_REGION.amazonaws.com/$CONTAINER_IMAGE ./app.

This is the modified Dockerfile :

name: Building and pushing a docker image to Amazon ECR
on: [push, pull_request]


env:
  AWS_DEFAULT_REGION: ap-southeast-1
  AWS_DEFAULT_OUTPUT: json
  AWS_ACCOUNT_ID: ${{ secrets.AWS_ACCOUNT_ID }}
  AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
  AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
  CONTAINER_IMAGE: myimage:${{ github.sha }}

jobs:
  build-and-push:
    name: Building and pushing image to AWS ECR
    runs-on: ubuntu-latest
    steps:

    - name: Checkout
      uses: actions/checkout@master

    - name: Setup ECR
      run: |
        $( aws ecr get-login --no-include-email )
    - name: Build and tag the image
      run: |
        docker image build -t $AWS_ACCOUNT_ID.dkr.ecr.$AWS_DEFAULT_REGION.amazonaws.com/$CONTAINER_IMAGE ./app
    - name: Push
      if: github.ref == 'refs/heads/master'
      run: |
        docker push $AWS_ACCOUNT_ID.dkr.ecr.$AWS_DEFAULT_REGION.amazonaws.com/$CONTAINER_IMAGE

Have forked your project and ran the same. Build and tag image step ran successfully on Git Actions.

It is failing in next step i.e. Push step with error as

The repository with name 'myimage' does not exist in the registry with id '***'.

For this you need to create image repository in ECR container registry. You can refer to this answer for the same Push docker image to amazon ecs repository

回答2:

❯ docker build " "
unable to prepare context: path " " not found

I think the article expects ./app/Dockerfile to run docker build. but there's no app directory so the action can not run.

来源：https://stackoverflow.com/questions/60611165/error-unable-to-prepare-context-path-not-found-while-building-and-tagging

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