Maybe something to be aware of: as of v2.10.15 the Prefect docker image for Python 3.9 seems to be based on Debian Linux 12 (bookworm). The

adduser

command in Debian 12 works slightly different than the one in Debian 11, in the fact that on Debian 12 a home folder is not implicitly created any more for system users. Because of this upgrade, we have seen our Prefect jobs that use

persist_result=True

crash with this error:

12:07:48.020 | ERROR   | Flow run 'caped-dingo' - Crash detected! Execution was interrupted by an unexpected exception: Traceback (most recent call last):
  File "/usr/local/lib/python3.9/pathlib.py", line 1323, in mkdir
    self._accessor.mkdir(self, mode)
FileNotFoundError: [Errno 2] No such file or directory: '/nonexistent/.prefect/storage'

We fixed by adding

--home=/home/<my-user>

option to the

adduser

command in our Dockerfile.