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[Launchpad Bug Tracker <1618188@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package systemd - 235-3ubuntu3

---------------
systemd (235-3ubuntu3) bionic; urgency=medium

  * netwokrd: add support for RequiredForOnline stanza. (LP: #1737570)
  * resolved.service: set DefaultDependencies=no (LP: #1734167)
  * systemd.postinst: enable persistent journal. (LP: #1618188)
  * core: add support for non-writable unified cgroup hierarchy for container support.
    (LP: #1734410)

 -- Dimitri John Ledkov <xnox@xxxxxxxxxx>  Tue, 12 Dec 2017 13:25:32
+0000

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

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https://bugs.launchpad.net/bugs/1618188

Title:
  systemd journal should be persistent by default: /var/log/journal
  should be created

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Confirmed
Status in systemd source package in Zesty:
  Confirmed
Status in systemd source package in Artful:
  Confirmed
Status in systemd source package in Bionic:
  Fix Released

Bug description:
  After upgrading 14.04 -> 16.04, key services are now running on
  systemd and using the systemd journal for logging. In 14.04, key
  system logs like /var/log/messages and /var/log/syslog were
  persistent, but after the upgrade to 16.04 there has a been a
  regression of sorts: Logs sent to systemd's journald are now being
  thrown away during reboots.

  This behavior is controlled by the `Storage=` option in
  `/etc/systemd/journald.conf`. The default setting is `Storage=auto`
  which will persist logs in `/var/log/journal/`, *only if the directory
  already exists*. But the directory was not created as part of the
  14.04 -> 16.04 upgrade, so logging was being lost for a while before I
  realized what was happening.

  This issue could be solved by either creating /var/log/journal or
  changing the default Storage behavior to `Storage=persistent`, which
  would create the directory if need be.

  ## Related reference

   * `systemd` currently compounds the issue by having ["journal --disk-usage" report memory usage as disk usage](https://github.com/systemd/systemd/issues/4059), giving the impression that the disk is being used for logging when it isn't. 
   * [User wonders where to find logs from previous boots, unaware that the logs were thrown away](http://askubuntu.com/questions/765315/how-to-find-previous-boot-log-after-ubuntu-16-04-restarts)

  ## Recommended fix

  Restoring persistent logging as the default is recommended.

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