[Bug 1686361] Re: systemd does not respect nofile ulimit when running in container

[Łukasz Zemczak]

Thank you for uploading this stable release update! To ease the SRU
review process and later package validation, could you please update the
bug description to include the relevant SRU information [1]?

[1] https://wiki.ubuntu.com/StableReleaseUpdates#SRU_Bug_Template

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https://bugs.launchpad.net/bugs/1686361

Title:
  systemd does not respect nofile ulimit when running in container

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  New
Status in systemd source package in Yakkety:
  New
Status in systemd source package in Zesty:
  Fix Committed
Status in systemd source package in Artful:
  Fix Released

Bug description:
  When systemd currently starts in a container that has RLIMIT_NOFILE set to e.g.
  100000 systemd will lower it to 65536 since this value is hard-coded into systemd.
  I've pushed a patch to systemd upstream that will try to set
  the nofile limit to the allowed kernel maximum. If this fails, it will compute
  the minimum of the current set value (the limit that is set on the container)
  and the maximum value as soft limit and the currently set maximum value as the
  maximum value. This way it retains the limit set on the container.
  It would be great if we could backport this patch to have system adhere to
  nofile limits set for the container. This is especially important since user
  namespaces will allow you to lower the limit but not raise it back up afterwards.
  The upstream patch is appended.

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