[Bug 1584147] Re: cloud-init hangs on boot as Python waits for sufficient randomness to start

[Scott Moser]

** Also affects: python3.5 (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: python3.5 (Ubuntu)
       Status: New => Confirmed

** Changed in: python3.5 (Ubuntu)
   Importance: Undecided => High

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Title:
  cloud-init hangs on boot as Python waits for sufficient randomness to
  start

Status in cloud-images:
  Confirmed
Status in Python:
  Fix Committed
Status in cloud-init package in Ubuntu:
  Confirmed
Status in python3.5 package in Ubuntu:
  Confirmed
Status in python3.5 package in Debian:
  Confirmed

Bug description:
  If Python 3.5 starts before the kernel has initialised its RNG, it
  will hang[0] until there is sufficient entropy for it to randomise
  dictionary keys.

  As cloud-init uses Python 3.5, this means that cloud-init will hang
  until this happens (meaning that the instance won't be properly
  initialised).

  I have seen this cause a hang of up to 7 minutes on an OpenStack
  cloud.

  Upstream python bug is issue 26839 [1].

  [0] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=822431
  [1] https://bugs.python.org/issue26839

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