标记和推送 Docker 图像更改摘要

Question

拉取、标记然后推送我们在 Github 操作流中生成的 Docker 图像会导致推送带有新摘要的新图像，而不是简单地标记现有图像。

首先，我们使用 Docker build-push 操作的新 v2 构建映像（ https://github.com/docker/build-push-action ）

jobs:
  build-push:
    name: Build and push docker image
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v2
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v1
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
      - name: Login to GCR
        uses: docker/login-action@v1
        with:
          registry: gcr.io
          username: _json_key
          password: ${{ secrets.GOOGLE_APPLICATION_CREDENTIALS }}
      - id: docker_build
        uses: docker/build-push-action@v2
        with:
          tags: gcr.io/our-project/foo:initial-tag
          push: true
          target: build
          build-args: |
            NPM_TOKEN=${{ secrets.NPM_TOKEN }}

然后，在稍后的单独工作流程中，我们将该图像 ( gcr.io/our-project/foo:initial-tag ) 拉下来并添加新标签。

jobs:
  tag-image:
    name: Tag image
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v2
      - name: Login to GCR
        uses: docker/login-action@v1
        with:
          registry: gcr.io
          username: _json_key
          password: ${{ secrets.GOOGLE_APPLICATION_CREDENTIALS }}
      - run: |
          docker pull gcr.io/our-project/foo:initial-tag
          docker tag gcr.io/our-project/foo:initial-tag gcr.io/our-project/foo:new-tag
          docker push gcr.io/our-project/foo:new-tag

在推送new-tag之后，我希望我们的注册表包含一个带有initial-tag和new-tag的图像摘要。 相反，这会创建一个新的图像摘要，上面只有new-tag 。

Digest: sha256:abc123
Tags: gcr.io/our-project/foo:initial-tag

Digest: sha256:def456
Tags: gcr.io/our-project/foo:new-tag

此外，如果我们现在将标签（比如latest ）添加到new-tag ，它不会创建新的图像摘要

Digest: sha256:abc123
Tags: gcr.io/our-project/foo:initial-tag

Digest: sha256:def456
Tags: gcr.io/our-project/foo:new-tag, gcr.io/our-project/foo:latest

作为一种解决方法，我们发现推送不带标签的图像名称会正确地将标签分配给现有的摘要。

docker pull gcr.io/our-project/foo:initial-tag
docker tag gcr.io/our-project/foo:initial-tag gcr.io/our-project/foo:new-tag
docker push gcr.io/our-project/foo

Answer 1

crane cp将有效地复制图像并保留摘要值

https://github.com/google/go-containerregistry/blob/main/cmd/crane/doc/crane_copy.md

Answer 2

您可以导出 docker 图像并像这样推送。 然后 docker 图像摘要不会在您标记更多时更改。

- name: build docker image
  uses: docker/build-push-action@v3
  with:
    context: .
    file: 'Dockerfile'
    load: true
    tags: |
      ${{ steps.tag-container-image.outputs.TAG_A }}
      ${{ steps.tag-container-image.outputs.TAG_B }}
      ${{ steps.tag-container-image.outputs.LATEST }}

- name: push docker image
  run: |
    docker push ${{ steps.tag-container-image.outputs.TAG_A }}
    docker push ${{ steps.tag-container-image.outputs.TAG_B }}
    docker push ${{ steps.tag-container-image.outputs.LATEST }}