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[Launchpad Bug Tracker <1799251@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package systemd - 239-7ubuntu15

---------------
systemd (239-7ubuntu15) disco; urgency=medium

  * core: set /run size to 10%, like initramfs-tools does.
    Currently there is a difference between initrd and initrd-less boots,
    w.r.t. size= mount option of /run. This yields different runtime journald caps
    (1% vs 10%), and on dense deployments of containers may result in OOM kills.
    (LP: #1799251)
    File: debian/patches/debian/UBUNTU-core-set-run-size-to-10-like-initramfs-tools-does.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=1fac2568fe716dc1a41bada78293dc6327a6df0d

  * resolved: Increase size of TCP stub replies.
    DNS_PACKET_PAYLOAD_SIZE_MAX is limiting the size of the stub replies to
    512 with EDNS off or 4096 with EDNS on, without checking the protocol
    used. This makes TCP replies for clients without EDNS support to be
    limited to 512, making the truncate flag useless if the query result is
    bigger than 512 bytes.
    This commit increases the size of TCP replies to DNS_PACKET_SIZE_MAX
    Fixes: #10816
    (cherry picked from commit e6eed9445956cfa496e1db933bfd3530db23bfce)
    (LP: #1804487)
    Author: Victor Tapia
    File: debian/patches/resolved-Increase-size-of-TCP-stub-replies.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=702a4566174c4d2bd84b70805107cfc1a7c128cc

 -- Dimitri John Ledkov <xnox@xxxxxxxxxx>  Mon, 03 Dec 2018 13:49:24
+0000

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

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https://bugs.launchpad.net/bugs/1799251

Title:
  mount options for /run should be the same as initramfs tools

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  New
Status in systemd source package in Bionic:
  New
Status in systemd source package in Cosmic:
  Fix Committed

Bug description:
  mount options for /run should be the same as initramfs tools

  [Impact]

   * /run is mounted with different options on initrd boots, and initrd-
  less boots. For consistency it should be the same

   * In particular, this causes overuse of RAM on hosts with dense
  deployment of containers. Specifically, runtime journald takes up at
  most 10% or /run, which is capped at 10% of ram, thus 1% of total RAM.
  However, on initrd-less boots (like lxd launch ubuntu-daily:foo), /run
  takes up all of RAM, and thus run-time journal is now capped at 10% of
  RAM. Which is really bad when one deploys more than 10 containers...

  [Test Case]

   * Check total RAM on the host with `free -h`
   * lxd launch ubuntu-daily:release
   * In that container check the size of /run with `df -h | grep '/run$'`
   * /run should roughly be 1/10th of the total RAM.

  [Regression Potential]

   * /run is meant to be small, and it is small on systems booted with
  initrd and everything works fine there. Reducing the default size of
  /run in the containers should not have averse impacts. The most
  notable change is that runtime journald is now capped 10x smaller in
  the containers, to the same size as on the hosts. If that is not
  enough, one should $ sudo mkdir /var/log/journal to have a larger
  persistent journal.

  [Other Info]
   
   * This issue got escalated as affecting production deployments in the Canonical datacentre.

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