创建docker镜像时Prefect出错，是什么触发Prefect使用healthcheck.py创建临时文件夹

Question

当使用docker作为存储时，在调用中如下：

prefect register --project yourproject -p yourflow.py

似乎perfect创建了一个tmp{randomNumber}文件夹，并放置了参与docker构建的healthcheck.py和docker文件。

但是我不小心删除了tmp文件夹，即使我恢复了它，它仍然抛出以下错误。发生的事情是Prefect期望一个以新的random_number作为后缀的tmp文件夹。我如何才能从中恢复呢？

Step 10/11 : COPY ./tmpnu2k398p/healthcheck.py /opt/prefect/healthcheck.py
COPY failed: stat /var/lib/docker/tmp/docker-builder531146691/tmpnu2k398p/healthcheck.py: no such file or directory
Error loading 'prefect_register_flow.py':
  Traceback (most recent call last):
    File "/Users/zhengxie1/workspace/cog_ana_model_train/venv/lib/python3.7/site-packages/prefect/cli/build_register.py", line 134, in load_flows_from_script
    namespace = runpy.run_path(abs_path, run_name="<flow>")
    File "/Users/zhengxie1/.pyenv/versions/3.7.3/lib/python3.7/runpy.py", line 263, in run_path
    pkg_name=pkg_name, script_name=fname)
    File "/Users/zhengxie1/.pyenv/versions/3.7.3/lib/python3.7/runpy.py", line 96, in _run_module_code
    mod_name, mod_spec, pkg_name, script_name)
    File "/Users/zhengxie1/.pyenv/versions/3.7.3/lib/python3.7/runpy.py", line 85, in _run_code
    exec(code, run_globals)
    File "/Users/zhengxie1/workspace/cog_ana_model_train/prefect_register_flow.py", line 77, in <module>
    flow.storage.build()
    File "/Users/zhengxie1/workspace/cog_ana_model_train/venv/lib/python3.7/site-packages/prefect/storage/docker.py", line 303, in build
    self._build_image(push=push)
    File "/Users/zhengxie1/workspace/cog_ana_model_train/venv/lib/python3.7/site-packages/prefect/storage/docker.py", line 370, in _build_image
    "Your docker image failed to build!  Your flow might have "
  ValueError: Your docker image failed to build!  Your flow might have failed one of its deployment health checks - please ensure that all necessary files and dependencies have been included.

Answer 1

作为一种快速修复方法，您可以禁用健康检查：

from prefect.storage import Docker

Docker(ignore_healthchecks=True)

通常，看起来您在Docker容器中运行注册本身，这就是运行状况检查失败的原因。注册步骤是构建镜像，现在您正在从Docker容器构建Docker镜像，而不是从本地进程。从理论上讲，你可以用docker.sock来解决这个问题，但是有一种更简单的方法。

您可以为注册过程创建一个虚拟环境。在该环境中，您可以使用CLI一次性注册所有流，而不是使用自定义代码：

prefect register --project yourproject -p /path/to/flows/dir/

然后，将逐个注册dir目录中的所有流，并且Prefect将为每个流构建自己的Docker镜像。