问题描述
我正在使用Google Cloud构建来构建我的项目，但是我想不出一种方法来静默Docker的输出，而Docker正在拉取映像以用于给定的构建步骤。例如，假设我有一个cloudbuild.yaml文件，如下所示：
steps:
- name: 'gradle:6.6.1-jdk11'
entrypoint: bash
args:
- -c
- |
echo "bla"
运行此构建时，构建步骤的前40（！）行包括：
Starting Step #0
Step #0 - "Build & push container": Pulling image: gradle:6.6.1-jdk11
Step #0 - "Build & push container": 6.6.1-jdk11: Pulling from library/gradle
Step #0 - "Build & push container": 5d9821c94847: Pulling fs layer
Step #0 - "Build & push container": a610eae58dfc: Pulling fs layer
Step #0 - "Build & push container": a40e0eb9f140: Pulling fs layer
Step #0 - "Build & push container": 1854bb447e96: Pulling fs layer
Step #0 - "Build & push container": efdba649c66e: Pulling fs layer
Step #0 - "Build & push container": 5541276c408d: Pulling fs layer
Step #0 - "Build & push container": 38817ec8e266: Pulling fs layer
Step #0 - "Build & push container": db18551b94a0: Pulling fs layer
Step #0 - "Build & push container": 1854bb447e96: Waiting
Step #0 - "Build & push container": efdba649c66e: Waiting
Step #0 - "Build & push container": 5541276c408d: Waiting
Step #0 - "Build & push container": 38817ec8e266: Waiting
Step #0 - "Build & push container": db18551b94a0: Waiting
Step #0 - "Build & push container": a610eae58dfc: Verifying Checksum
Step #0 - "Build & push container": a610eae58dfc: Download complete
Step #0 - "Build & push container": a40e0eb9f140: Verifying Checksum
Step #0 - "Build & push container": a40e0eb9f140: Download complete
Step #0 - "Build & push container": 5d9821c94847: Verifying Checksum
Step #0 - "Build & push container": 5d9821c94847: Download complete
Step #0 - "Build & push container": 1854bb447e96: Verifying Checksum
Step #0 - "Build & push container": 1854bb447e96: Download complete
Step #0 - "Build & push container": 5541276c408d: Verifying Checksum
Step #0 - "Build & push container": 5541276c408d: Download complete
Step #0 - "Build & push container": efdba649c66e: Verifying Checksum
Step #0 - "Build & push container": efdba649c66e: Download complete
Step #0 - "Build & push container": 38817ec8e266: Verifying Checksum
Step #0 - "Build & push container": 38817ec8e266: Download complete
Step #0 - "Build & push container": db18551b94a0: Verifying Checksum
Step #0 - "Build & push container": db18551b94a0: Download complete
Step #0 - "Build & push container": 5d9821c94847: Pull complete
Step #0 - "Build & push container": a610eae58dfc: Pull complete
Step #0 - "Build & push container": a40e0eb9f140: Pull complete
Step #0 - "Build & push container": 1854bb447e96: Pull complete
Step #0 - "Build & push container": efdba649c66e: Pull complete
Step #0 - "Build & push container": 5541276c408d: Pull complete
Step #0 - "Build & push container": 38817ec8e266: Pull complete
Step #0 - "Build & push container": db18551b94a0: Pull complete
Step #0 - "Build & push container": Digest: sha256:c40a882448431c71719d33939ee5418db2333e3380e9940f632cdb597d230dcc
Step #0 - "Build & push container": Status: Downloaded newer image for gradle:6.6.1-jdk11
Step #0 - "Build & push container": docker.io/library/gradle:6.6.1-jdk11
这是我不需要的信息，我想关闭pull进程的日志记录，但是找不到任何配置选项。
解决方法
我已经找到了一个不错的解决方案，但不是解决方案，而是更多的解决方法。如果您在实际对图像执行 步骤的步骤之前执行，并在启用-q开关的情况下拉动图像，则会减少很多噪音。诀窍是对已经缓存在Cloud Build节点（在本例中为docker pull）上的Google图像执行gcr.io/cloud-builders/docker，因此也不必获取该图像。 YAML看起来像这样：
steps:
- name: 'gcr.io/cloud-builders/docker'
id: "Prefetch Gradle container"
args: [ "pull","-q","gradle:6.6.1-jdk11" ]
- name: 'gradle:6.6.1-jdk11'
entrypoint: bash
args:
- -c
- |
echo "bla"
输出看起来像这样：
Starting Step #0 - "Prefetch Gradle container"
Step #0 - "Prefetch Gradle container": Already have image (with digest): gcr.io/cloud-builders/docker
Step #0 - "Prefetch Gradle container": docker.io/library/gradle:6.6.1-jdk11
Finished Step #0 - "Prefetch Gradle container"
Starting Step #1 - "Build & push container"
Step #1 - "Build & push container": Already have image: gradle:6.6.1-jdk11
这不是很理想，因为额外的步骤花费了Cloud Build的时间比拉取图像要更长的时间（不确定为什么），但是它确实消除了许多不必要的日志行。