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[Launchpad Bug Tracker <1686361@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package systemd - 232-21ubuntu4

---------------
systemd (232-21ubuntu4) zesty; urgency=medium

  * Cherrypick upstream commit to enable system use kernel maximum limit for
    RLIMIT_NOFILE isntead of hard-coded (low) limit of 65536.  (LP: #1686361)
  * debian/tests/root-unittests: disable execute and seccomp tests on arm
    test-seccomp and test-execute fail on arm64 kernels. Marking both tests as
    expected failures. An upstream bug report is filed to resolve these.
    (LP: #1672499)
  * Cherrypick upstream patch for platform predictable interface names.
    (LP: #1686784)
  * resolved: fix null pointer dereference crash (LP: #1621396)
  * Cherrypick core/timer downgrade message about random time addition
    (LP: #1692136)

 -- Dimitri John Ledkov <xnox@xxxxxxxxxx>  Wed, 24 May 2017 16:26:16
+0100

** Changed in: systemd (Ubuntu Zesty)
       Status: Fix Committed => Fix Released

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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 Released
Status in systemd source package in Artful:
  Fix Released

Bug description:
  [Impact]

   * Containers cannot use maximum RLIMIT_NOFILE, because systemd sets
  an arbitrary cap.

  [Test Case]

   * Start container with high RLIMIT_NOFILE (e.g. 100 000)
   * Check that RLIMIT_NOFILE on the container is more than 65536

  [Regression Potential]

   * This is a feature / change of behaviour. Some users may be relying
  on the lower RLIMIT_NOFILE cap, but it should not have a negative
  impact on the host (as in creating too many file descriptors/denial of
  service).

  [Original Bug Report]

  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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